Bsi bs 4a 104 2002 + a2 2012

Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BRITISH STANDARD AEROSPACE SERIES

Specification for
Specification
for
corrosion-resisting
corrosion-resisting
steel bolts
steel
bolts (Unified
(Unified
hexagons and
hexagons
and Unified
Unified
threads), for
strength
class
threads)
aircraft
880 MPa, for aircraft

ICS 49.030.20

BS 4A
4A 104:2002
104:2002
BS
Amendment

No. 1
+A2:2012


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

Committees responsible for this
British Standard
The preparation of this British Standard was entrusted to
Technical Committee ACE/12, Aerospace fasteners and fastening, upon
which the following bodies were represented:
Civil Aviation Authority (Airworthiness Division)
Confederation of British Forgers
Institute of Petroleum
Ministry of Defence
Society of British Aerospace Companies Ltd.

This
This British
British Standard,
Standard, having
having
been
been prepared
prepared under
under the
the

direction
direction of
of the
the Engineering
Engineering
Sector
Sector Policy
Policy and
and Strategy
Strategy
Committee,
Committee, was
was published
published
under
the
authority
under the authority of
of the
Standards
Policy
and Strategy
the Standards
Policy
Committee
onCommittee
28 January 2002
and Strategy
on 28 January 2002
© BSI 2006

© The British Standards
Institution 2012
Published by BSI Standards
Limited 2012
The
The following
following BSI
BSI references
references
relate
relate to
to the
the work
work on
on this
this
standard:
standard:
Committee
Committee reference
reference ACE/12
ACE/12
Draft
Draftsfor
forcomment
comment00/704897 DC
00/704897 DC,
12/30262055 DC

ISBN 0978

580 78766
9
ISBN
5800 33291
8

Amendments issued since publication
Amendments issued since publication
Amd. No.
Date
Comments
Amd. No.
Date
Comments
16375
June 2006
Corrections to Table 3.
16375
June 2006
Corrections to Table 3.
A2

September 2012 See Foreword.


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
BS 4A 104:2002+A2:2012

Contents
Committees responsible
Foreword
1
2
3
4
5
6
7
8
9
10

Page
Inside front cover
ii

Scope
Normative references
General requirements
Materials and manufacture
Dimensions and tolerances
Screw threads
Protective
finish
Surface treatment
Hardness values
Identification and marking
Quality assurance procedure

1
1
1
1
1
2
1
2
2
2
2

Table 1 — Materials for manufacture of bolts
Table 2 — Dimensions of bolts
Table 3 — Bearing length L, clamping length M and overall length E

2
5
7

Figure 1 — Dimensions of bolts (see Table 2)
Figure 2 — Bearing length L, clamping length M and overall length E
(see Table 3)

4

© BSI
The 2006
British Standards Institution 2012

©

6

ii


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Miss
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Lucie Carter,
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Standards Institution,
09:25, Uncontrolled
07/08/2012
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The British Standards
Copy, (c) The
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British2012
Standards Institution 2012

BS

BS 4A
4A 104:2002
104:2002+A2:2012

Foreword

BS 4A 104:2002

This
been prepared
TechnicalLimited,
Committee
ACE/12.
It is a
This British
British Standard
Standard has
is published
by BSIbyStandards
under
licence
from TheofBritish
Institution.
This British
Standard has been
revision
BS 3A Standards
104:1962 which
is superseded
and withdrawn.

prepared
by Technical
ACE/12.
It is arequirements
revision of BSin3A
This
revision
of BS 3A Committee
104 refers to
the relevant
BS104:1962
A 100. It
which
is
superseded
and
withdrawn.
incorporates amendment 1 of BS 3A 104 and updates and revises material
specifications.
BS 4A 104:2002+A2:2012 supersedes BS 4A 104:2002 (incorporating
Amendment
No.
1), which to
is previous
withdrawn.
NOTE
Fasteners
manufactured
editions of this specification may continue to be supplied

Foreword
until stocks are exhausted.

The start and finish of text introduced or altered by Amendment No.2 is
A
British Standard
not .
purportMinor
to include
all the
necessary
provisions
indicated
in the textdoes
by tags
editorial
changes
are not
tagged. of a
contract.
Users
of British
Standards
are responsible
for
their correct
application.
This
British
Standard

has
been
prepared
by
Technical
Committee
ACE/12.
This revision of BS 3A 104 refers to the relevant requirements in BS A 100. It is a
Compliance
with
a British
Standard
does
not
confer immunity
revision
of BS
3A
104:1962
which
isthat
superseded
andofwithdrawn.
Amendment
A2
introduces
changes
take
account
ofitself

the mechanical
properties
from
legal
obligations.
This
revision
of
BS
3A
104
refers
to
the
relevant
requirements
in BS
A 100. It
of high expansion heat-resisting steels. In addition amendment A2
introduces
incorporates
amendment
1 ofmade
BS 3A
104high
andexpansion
updates and
revises material
a part number
code for bolts

from
heat-resisting
steels to
specifications.
distinguish them from bolts made from the other materials (see Clause 9).
NOTE Fasteners manufactured to previous editions of this specification may continue to be supplied
until stocks are exhausted.

A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages
This document comprises a front cover, and inside front cover, pages i and ii,
pages 1 to 16, an inside back cover and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.

ii

© The British Standards Institution
© BSI 2012
2006
Summary of pages
This document comprises a front cover, and inside front cover, pages i and ii,
pages 1 to 16, an inside back cover and a back cover.


Licensed

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Lucie
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07/08/2012
Standards
07/08/2012
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09:25,
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09:25,
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The
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British
2012
Standards
Standards

2012 Institution
Institution
2012
2012

BS 4A 104:2002
BS 4A 104:2002
BS 4A 104:2002+A2:2012

1 Scope
1 Scope

BS 4A 104:2002

BS 4Aand
104:2002
This British Standard specifies materials and manufacture, dimensions, protective treatment
quality
assurance
requirements
for corrosion-resisting
steel hexagondimensions,
head bolts with
unifiedtreatment
threads and
tensile
This
Standard
materials
protective

and
This British
British
Standard specifies
specifies
materials and
and manufacture,
manufacture,
dimensions,
protective
treatment
andaquality
quality
strength
880/1 080 MPa.
assurance
for
hexagon
head bolts with
threads
and awith
tensile
assuranceofrequirements
requirements
for corrosion-resisting
corrosion-resisting steel
and
heat-resisting
steelunified
hexagon

head bolts
unifiedThe
threads
and
minimum
ofby880
Text
deleted. MPa.
strength
of
880/1
080aofMPa.
NOTE
latest
edition
an Aerospace Series tensile
standardstrength
is indicated
a prefix
number.
NOTE The latest edition of an Aerospace Series standard is indicated by a prefix number.

2 Normative references
2
Normative
references
1
Scope
The
following normative documents contain provisions which, through reference in this text, constitute

provisions
ofStandard
this
British
Standard.
dated
references,
subsequent
to,
ortext,
revisions
of, any
The
normative
documents
contain
which,
throughamendments
reference
intreatment
this
The following
following
documents
in whole
orFor
in part,
are
normatively

referenced
in this document
andconstitute
are quality
This
British
specifies
materials
andprovisions
manufacture,
dimensions,
protective
and
1
Scope
of
these
publications
do
not
apply.
For
undated
references,
the
latest
edition
of
the
publication

referred
to
indispensible
for
its
application.
For
dated
references,
only
the
edition
cited
applies.
For
undated
provisions
of
this
British
Standard.
For
dated
references,
subsequent
amendments
to,
or
revisions
any

assurance requirements for corrosion-resisting steel hexagon head bolts with unified threads and a of,
tensile
applies.
references,
the
latest
edition
of
the
referenced
document
(including
any
amendments)
applies.
of
these
publications
do
not
apply.
For
undated
references,
the
latest
edition
of
the
publication

referred
to
This British
Standard
specifies materials and manufacture, dimensions, protective treatment and quality
strength
of 880/1
080 MPa.
applies.
BS
A
100,
Specification
for
general
requirements
for
bolts
and
free
running
nuts
of
tensile
strength
not
assurance
requirements
corrosion-resisting
steel

hexagon
headnumber.
bolts with unified threads and a tensile
NOTE
The latest
edition of anfor
Aerospace
Series standard is
indicated
by a prefix
exceeding
249 MPa.
strength
880/1
080 MPa.
BS A 100,of1Specification
for general requirements for bolts and free running nuts of tensile strength not
2
references
exceeding
1 249edition
MPa.
NOTE
TheSpecification
latest
of for
an Aerospace
Series standard is corrosion-resisting
indicated by a prefix number.
BSNormative

S 80,
high chromium-nickel
steel forging stock, bars, forgings and
100
mm).
parts
(880-1
080
MPa,
limiting
ruling
section
10
mm).
BS Sfollowing
80, Specification
fordocuments
high chromium-nickel
corrosion-resisting
steelreference
forging stock,
and
The
normative
contain
provisions
which,
through
in thisbars,
text,forgings

constitute
2
Normative
references
parts
(880-1
limiting
ruling
mm).
provisions
of080
thisMPa,
British
Standard.
Forsection
dated 10
references,
subsequent
amendments to,
or revisions
of, any
BS S 143,
Specification
for
chromium-nickel-copper-molybdenum
corrosion-resisting
steel
(precipitation
The
normative

documents
contain
provisions
which,
reference
inpublication
this
constitute
hardening)
billets,
bars,
forgings
parts
(930-1
080 MPa).
of
publications
do for
not
apply.and
For
undated
references,
the through
latest
edition
of the
referred to
BSthese
Sfollowing

143,
Specification
chromium-nickel-copper-molybdenum
corrosion-resisting
steeltext,
(precipitation
provisions
this British
Standard.
For
dated
references,
subsequent
amendments
or revisionsof
any
applies.
hardening)
bars, forgings
parts
(930-1
080 MPa).
BS HR
HR 650,
Specification
for
highand
expansion
heat-resisting
steel

wire for
for the
theto,
manufacture
ofof,bolts,
bolts,
BS
650,ofbillets,
Specification
for high
expansion
heat-resisting
steel bar
bar and
and
wire
manufacture
of
these
publications
do
not
apply.
For
undated
references,
the
latest
edition
of

the
publication
referred
to
studs,
set
screws
andnuts
nuts
(Ni
25.5,expansion
Cr15,
15,Ti
Ti2,
2,Mn
Mn
1.5,
Moand
1.25,
Sirunning
0.7,
0.3)
(Limiting
ruling
section
BS
A
100,
Specification
for

general
requirements
for
bolts
free
nuts
of
strength
studs,
set
crews
and
(Ni
25.5,
Cr
1.5,
Mo
1.25,
Si
0.7,
0.3)
(Limiting
ruling
section
HR
650,
Specification
for
high
heat-resisting

steel
bar
andVVwire
for
thetensile
manufacture
ofnot
bolts,
applies.
50 mm).
20
mm).
exceeding
1 249 and
MPa.nuts (Ni 25.5, Cr 15, Ti 2, Mn 1.5, Mo 1.25, Si 0.7, V 0.3) (Limiting ruling section
studs,
set crews
BS
A
100,
Specification
forhigh
general
requirements
for bolts
and free(X6NiCrTiMoV26-15)
running
nuts of
tensile
strength

20
mm).
BS
S
80,
Specification
for
chromium-nickel
steel forging
stock,
bars,
forgings
and–
BS
EN 2398,
Aerospace
series
– Heat
resisting corrosion-resisting
steel
FE-PA2601
– Rm
= 900not
MPa
3
General
requirements
exceeding
1
249

MPa.
parts
(880-1
080 MPa,
limiting
ruling
section 10 mm).
Bars
for
machined
bolts
–
D
=
25
mm.
3
General
requirements
BS
S
80,
Specification
high
chromium-nickel corrosion-resisting
steel forging stock,
bars,
forgings and
Bolts
shall

conform to for
BS
Achromium-nickel-copper-molybdenum
100.
BS
S
143,
Specification
for
corrosion-resisting
(precipitation
BS
EN
2399,
Aerospace
series
– ruling
Heat resisting
steel
FE-PA2601 (X4NiCrTi
MoV26-15)steel
– Rm
≥ 900 MPa –
parts
(880-1
080 MPa,
limiting
section
10
mm).

Bolts
shall
conform
to
BS
A
100.
hardening)
billets,
bars,
forgings
and
parts
(930-1
080
MPa).
Bars
for forged bolts
D ≤ 25 mm.
4
Materials
and–manufacture
BS
S
143,
Specification
forfor
chromium-nickel-copper-molybdenum
corrosion-resisting
steel (precipitation

BS
HR
650,
Specification
high expansion heat-resisting steel bar
and wire for the manufacture
of bolts,
4
and
manufacture
BSMaterials
EN ISO billets,
6506-1,
Metallic
materials
– Brinell
hardness
test – Part 1: Test method.
hardening)
bars,
forgings
and
parts
(930-1
080
MPa).
studs,
crews
andbenuts
(Ni 25.5, Crby

15,
Ti of
2, the
Mnfollowing
1.5, Mo 1.25,
Si 0.7, V 0.3) (Limiting ruling section
4.1 Thesetbolts
shall
manufactured
one
methods:
BS
HR
650,
Specification
for materials
high expansion
steel
bar and
wiremethod.
for the manufacture of bolts,
BS mm).
EN ISO
Metallic
Vickers
hardness
test
– Part
1: Test
20

4.1
bolts6507-1,
shall be
manufactured
by–which
one
ofheat-resisting
the
following
methods:
a)The
machined
drawn
one
of the
British
Standards
specified
in Table 1;
studs,
set crewsfrom
and bright
nuts (Ni
25.5, bars
Cr 15,
Ti 2,conform
Mn 1.5,to
Mo
1.25,
Si 0.7,

V 0.3)
(Limiting
ruling section
a)
machined
from
bright
drawn
bars
which
conform
to
one
of
the
British
Standards
specified
3
General
requirements
20b)mm).
forged from material which conforms to one of the British Standards specified in Table 1. in Table 1;
b) forged
from
material
which
conforms to one of the British Standards specified in Table 1.
Bolts
shall

conform
to for
BSthe
A 100.
4.2
The
material
used
manufacture of forged bolts shall have the following mechanical properties
3
General
requirements
in
heat-treated
condition:
4.2the
Thefinally
material
used for the
manufacture of forged bolts shall have the following mechanical properties
4
Materials
and
Bolts
shall
conform
tomanufacture
BS condition:
A 100.
in

the
finally
heat-treated
a) proof stress (min.): 0.2 % 690 MPa;
4.1
The bolts
shall
be manufacture
manufactured
by one of the following methods:
4 a)
Materials
and
(min.):
0.2 %to690
MPa;
b) proof
tensilestress
stress:
880 MPa
1 080
MPa;
a)
machined
from880
bright
drawn
bars
which conform to one of the British Standards specified in Table 1;
b)

tensile
stress:
MPa
to
1
080
MPa;
4.1c)The
bolts shall
be manufactured
by
one of the following methods:
elongation
(min.):
12%;
b)
forged from(min.):
material
which conforms to one of the British Standards specified in Table 1.
c)
elongation
12%;
a)
from
bright
d) machined
Izod impact
(min.):
55 drawn
J (40 ft.bars

lbf).which conform to one of the British Standards specified in Table 1;
4.2d)
used for
manufacture
forged
bolts
shallStandards
have the following
Izodmaterial
impact
(min.):
55the
J (40
ft. lbf). toofone
b)The
forged
from material
which
conforms
of the
British
specifiedmechanical
in Table 1. properties
5
and tolerances
in Dimensions
the finally heat-treated
condition:
5
andfortolerances

4.2Dimensions
The material used
the manufacture of forged bolts shall have the following mechanical properties
a)All
proof
stressbolts
(min.):
0.2conform
% 590
690 MPa; MPa;
5.1
finished
shall
in the
finally
heat-treated
condition:to the dimensions and tolerances specified in Figure 1 and Table 2.
5.1b)All
finished
bolts
shall
conform
to
theText
dimensions
and tolerances specified in Figure 1 and Table 2.
tensile
stress:
880
MPa

tobolt
1880
080
MPa;
stress
(min):
MPa
deleted.;
5.2a)The
clamping
length
of the
shall
conform to
the dimensions and tolerances specified in Table 2, and
proof
stress (min.):
0.2
% 690
MPa;
shall
be clamping
such that
when12%;
aofstandard
nut without
or ringand
gauge
is screwed
on as in

farTable
as possible
5.2c)The
length
the bolt shall
conformcountersink
to the dimensions
tolerances
specified
2, and
elongation
(min.):
b)
tensile
880
to 1 080
MPa;
by
hand,
its stress:
leading
faceMPa
within
anut
distance
M from
the underside
the bolt
head. The
run-out

the
shall
be such
that when
aisstandard
without
countersink
or ring of
gauge
is screwed
on as
far as of
possible
d)
Izod
impact
(min.):
55
(40
thread
shall
not(min.):
exceed
twice
theft.
thread
pitch.
by
its
leading

face
is J
within
albf).
distance
M from the underside of the bolt head. The run-out of the
c)hand,
elongation
12%;
thread
shallThis
not exceed
twice
the
pitch. in BS HR 650, BS EN 2398 and BS EN 2399.

NOTE 
not
applicable
thethread
5
Dimensions
and
tolerances
Izod
impactis length
(min.):
55
J to
(40

ft.materials
lbf). begiven
5.3d)
The
nominal
of
the
bolt
shall
the minimum bearing length L, which is determined by the
minimum
clamping
length,
M,bolt
lessshall
two thread
(see
Table 3).
5.3
The nominal
length
of the
be the pitches
minimum
bearing
length L, which is determined by the
5.1
All finished bolts
shall
conform to the dimensions and tolerances specified in Figure 1 and Table 2.

5
Dimensions
and
tolerances
minimum
clamping
length,
M, less
two3thread
pitches
(see Table
NOTE
The bearing
lengths
L specified
in Table
are in 0.10
inch increments
but3).
where a 0.05 length increment is required this
should
be
by
agreement
between
manufacturer
and
user
and
should

be
identified
as
follows:
8length
B,in
indicating
a16-32
UNC
bolt
5.2
The
clamping
length
of
the
bolt
shall
conform
to
the
dimensions
and
tolerances
specified
in
Table
2,
and
NOTE

The
bearing
lengths
L
specified
in
Table
3
are
in
0.10
inch
increments
but
where
a 0.05
increment
is required
this
5.1 All finished bolts shall conform to the dimensions and tolerances
specified
Figure
and
Table
2.of
bearing
length
L that
0.85 inches.
M

E need to
be
adjusted
accordingly.
should
be
by
agreement
between
manufacturer
and
user and
should be identified
as follows:
B, indicating
bolt of
shall be
such
when
a and
standard
nut
without
countersink
or ring
gauge 8isscrewed
on aas6-32
farUNC
as possible
bearing

0.85 length
inches.
Ebolt
needa
todistance
be adjusted
5.2
Thelength
clamping
the
shall
conform
to the
dimensions
tolerances
specified
in Table
by hand,
its Lleading
faceMof
isand
within
Maccordingly.
from
the
undersideand
of the
bolt head.
The run-out
of 2,

theand
6
Screw
threads
shall
beshall
such
that
when twice
a standard
nut without
thread
not
exceed
the thread
pitch. countersink or ring gauge is screwed on as far as possible
6
Screwitsthreads
by
leading
is within
distance
underside
of the
boltlatest
head. edition
The run-out
of the
Thehand,
bolts shall

have face
unified
screw athreads
of M
thefrom
formthe
and
fit specified
in the
of British
5.3
Theshall
nominal
length twice
of thethe
boltthread
shall be
the minimum bearing length L, which is determined by the
thread
exceed
pitch.
Standard
BSnot
A have
100.
The
bolts shall
unified screw
threads
of the form and fit specified in the latest edition of British

minimum clamping length, M, less two thread pitches (see Table 3).
Standard
BS A 100.
5.3 The nominal
length of the bolt shall be the minimum bearing length L, which is determined by the
NOTE The bearing lengths L specified in Table 3 are in 0.10 inch increments but where a 0.05 length increment is required this
minimum
length,manufacturer
M, less twoand
thread
pitches
Table 3).
should
be by clamping
agreement between
user and
should (see
be identified
as follows: 8 B, indicating a 6-32 UNC bolt of
bearing
length
L 0.85
inches.LM
and E need
to be3adjusted
accordingly.
NOTE The
bearing
lengths
specified

in Table
are in 0.10
inch increments but where a 0.05 length increment is required this
should be by agreement between manufacturer and user and should be identified as follows: 8 B, indicating a 6-32 UNC bolt of
© BSI
2006
6
Screw
bearing
lengththreads
L 0.85 inches. M and E need to be adjusted accordingly.
© BSI
The 2006
British Standards Institution 2012
©

The
bolts shall
have unified screw threads of the form and fit specified in the latest edition of British
6 Screw
threads
Standard BS A 100.

1
11


ucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

c) elongation (min.): 12%;

d) Izod impact (min.): 55 J (40 ft. lbf).

BS
4A 104:2002+A2:2012
5 Dimensions
and tolerances
5.1 All finished bolts shall conform to the dimensions and tolerances specified in Figure 1 and Table 2.
5.2 The clamping length of the bolt shall conform to the dimensions and tolerances specified in Table 2, and
shall be such that when a standard nut without countersink or ring gauge is screwed on as far as possible
by hand, its leading face is within a distance M from the underside of the bolt head. The run-out of the
thread shall not exceed twice the thread pitch.
5.3 The nominal length of the bolt shall be the minimum bearing length L, which is determined by the
minimum clamping length, M, less two thread pitches (see Table 3).
NOTE The bearing lengths L specified in Table 3 are in 0.10 inch increments but where a 0.05 length increment is required this
should be by agreement between manufacturer and user and should be identified as follows: 8 B, indicating a 6-32 UNC bolt of
bearing length L 0.85 inches. M and E need to be adjusted accordingly.

6 Screw threads
The bolts shall have unified screw threads of the form and fit specified in the latest edition of British
Standard BS A 100.

BS
104:2002 finish
74A
Protective
There shall be no protective finish applied.
1

© BSI
2006

8
Hardness
values

The hardness values of finished bolts shall be as follows in accordance with the BS EN ISO 6506-1 and
BS EN ISO 6507-1:
a) for machined components: 255 min./321 max. HB or 270 min./340 max. HV;

7 Surface treatment

b) for forged components: 248 min./341 max. HB or 260 min./360 max. HV.

NOTE Surface treatment is not currently applicable.

9 Hardness
Identification
and marking
8
values
The
hardness
values of finished bolts shall be as follows:
9.1
Identification
a) 255 min./321 max. HB; or
Bolts made from material conforming to BS HR 650, BS EN 2398 or BS EN 2399 shall be identified with
b) 270
min./340
max.
HV bolt

for machined
components;
a code
“X”,
e.g. a 4-40
UNC
with an “L”
dimension and
of 0.1 inches and made from one of the three
materials above shall be identified as “A104X1A” or for bolts made from material conforming to BS S 80
c) 248 min./341 max. HB; or
or BS S 143, this shall be identified as “A104-1A”.
d) 260 min./360 max. HV for forged components.
9.2 Marking

9 Identification and marking

Bolts shall be marked in accordance with BS 4A 100:2003, Clause 8. Bolts for all nominal sizes made
frombolts
material
HR 650, with
BS EN
or BS ENclause
2399 shall
The
shallconforming
be marked to
in BS
accordance
BS2398

3A 100:1991,
8. be marked with an “X”.

10 Quality assurance procedure
The bolts shall conform to the quality requirements specified in BS A 100, as appropriate to the method of
manufacture.
Table 1 — Materials for manufacture of bolts

BS No.

BS No.

6S 80
BS S 80
BS143
S 143
2S

BS HR
HR
650 650
BS EN 2398
BS EN 2399


2

Material

Material

Application
Application

2 % nickel-chromiumFor the manufacture of machined
2 1/2% nickel-chromium-molybdenum
steel For thebolts
manufacture of machined bolts
molybdenum steel
Chromium-nickel-molybdenum
corrosion- For theFor
manufacture
of machined
bolts
Chromium-nickel-molybdenum
the manufacture
of machined
resisting steel corrosion-resisting steel
bolts
High expansion
heat-resisting
steel
For
theFor
manufacture
of forged
bolts
High
expansion heat-resisting
steel

the manufacture
of forged
(Nominal
size (P) and larger)
bolts
High expansion heat resisting steel
For the manufacture of machined bolts
High expansion heat resisting steel
For the manufacture of forged bolts


© The British Standards Institution 2012


4





a)

B

C

30º

D

M*

(for ref.
only)

F


b)

30º

D

Figure 1 — Dimensions of bolts (see Table 2)

G

45º

Max. runout of
thread = 2 x pitch

(overall length)

E*

(clamping length)

A

R rad.

15º

(bearing length)

L*

0.015 in

R rad.
Dia. of washer
0
face = B min. - 0.01 in

Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

© The British Standards Institution
© BSI 2012
2006


1

2

2 3

34

45

56

6 7

78

8 9

9 10

10 11

11 12

1213

13
14

14
15

15

in

in in

max.

size

A

in
in

max.
min.

A

in
in

min.

© BSI
The 2006
British Standards Institution 2012
â
F

0.050

0.300
0.063
0.277
0.063
0.327
0.063
0.377

inin

0.300
0.188
0.277
0.250
0.327
0.312
0.377
0.344

in in

Ref. only Ref. max.
only

F



(2 ì
portion

portion
pitch)
of shankof shank

inin

max.
min.

0.188
0.183
0.250
0.245
0.312
0.307
0.344
0.339

B

B

0.183
0.217
0.245
0.289
0.307
0.361
0.339
0.397

in in

min.
max.

C

0.217
0.070
0.289
0.085
0.361
0.100
0.397
0.115

in in

max.
max.

C

in in

0.070
0.060
0.085
0.075

0.100
0.090
0.115
0.105

in in

min.
max.

0.060
0.015
0.075
0.015
0.090
0.020
0.105
0.020

D

max.
min.

D

inin

max.
min.

R

0.015
0.005
0.015
0.005
0.020
0.010
0.020
0.010

R

0.005
0.020
0.005
0.030
0.010
0.030
0.010
0.030

in
in

min.
max.

in

in

max.
min.

0.020
0.015
0.030
0.020
0.030
0.020
0.030
0.020

G

in

min.

0.015
0.020
0.020
0.020

G

 This dimension
 This dimension
is an absolute

is an absolute
minimumminimum
associated
associated
with maximum
with maximum
length Mlength
and minimum
M and minimum
length E.length
It is not
E. intended
It is not intended
for use for
formanufacturing
use for manufacturing
or inspection
or inspection
purposes.purposes.



* For bearing
* Forlength
bearing
L,length
clamping
L, clamping
length Mlength
and overall

M andlength
overall
E length
see Table
E see
3. Table 3.

1.00-121.0000
UNF
1.000-12
1.000-12
UNF (W)
UNF (W)
1.0000
0.9995 0.9995
0.9955 0.9955
0.167 0.167
1.478 1.478
1.438 1.438
1.426 1.426
1.660 1.660
0.620 0.620
0.610 0.610
0.030 0.030
0.015 0.015
0.075 0.075
0.065 0.065

5/8-18 UNF
0.625-18

0.625-18
UNF (Q)
UNF (Q)
0.6250
0.6250
0.6245 0.6245
0.6205 0.6205
0.111 0.111
0.949 0.949
0.938 0.938
0.929 0.929
1.083 1.083
0.390 0.390
0.380 0.380
0.030 0.030
0.015 0.015
0.060 0.060
0.050 0.050
3/4-16 UNF
0.750-16
0.750-16
UNF (S)
UNF (S)
0.7500
0.7500
0.7495 0.7495
0.7455 0.7455
0.125 0.125
1.120 1.120
1.062 1.062

1.052 1.052
1.227 1.227
0.480 0.480
0.470 0.470
0.030 0.030
0.015 0.015
0.075 0.075
0.065 0.065
7/8-14 UNF
0.875-14
0.875-14
UNF (U)
UNF (U)
0.8750
0.8750
0.8745 0.8745
0.8705 0.8705
0.143 0.143
1.302 1.302
1.250 1.250
1.240 1.240
1.443 1.443
0.530 0.530
0.520 0.520
0.030 0.030
0.015 0.015
0.075 0.075
0.065 0.065

7/16-20 UNF

0.4375-20
0.4375-20
UNF (L)
UNF0.4375
(L)
0.4375
0.4370 0.4370
0.4335 0.4335
0.100 0.100
0.670 0.670
0.688 0.688
0.679 0.679
0.794 0.794
0.270 0.270
0.260 0.260
0.030 0.030
0.015 0.015
0.050 0.050
0.040 0.040
1/2-20 UNF
0.500-20
0.500-20
UNF (N)
UNF (N)
0.5000
0.5000
0.4995 0.4995
0.4960 0.4960
0.100 0.100
0.770 0.770

0.750 0.750
0.741 0.741
0.866 0.866
0.300 0.300
0.290 0.290
0.030 0.030
0.015 0.015
0.050 0.050
0.040 0.040
9/16-18 UNF
0.5625-18
0.5625-18
UNF (P)
UNF0.5625
(P)
0.5625
0.5620 0.5620
0.5585 0.5585
0.111 0.111
0.859 0.859
0.875 0.875
0.866 0.866
1.010 1.010
0.350 0.350
0.340 0.340
0.030 0.030
0.015 0.015
0.050 0.050
0.040 0.040

1/4-28 UNF
0.250-28
0.250-28
UNF (E)
UNF (E)
0.2500
0.2500
0.2495 0.2495
0.2465 0.2465
0.071 0.071
0.459 0.459
0.438 0.438
0.431 0.431
0.505 0.505
0.150 0.150
0.140 0.140
0.030 0.030
0.015 0.015
0.040 0.040
0.030 0.030
5/16-24 UNF
0.3125-24
0.3125-24
UNF (G)
UNF0.3125
(G) 0.3125
0.3120 0.3120
0.3090 0.3090
0.083 0.083
0.497 0.497

0.500 0.500
0.493 0.493
0.577 0.577
0.180 0.180
0.170 0.170
0.030 0.030
0.015 0.015
0.040 0.040
0.030 0.030
3/8-24 UNF
0.375-24
0.375-24
UNF (J)
UNF (J)
0.3750
0.3750
0.3745 0.3745
0.3715 0.3715
0.083 0.083
0.597 0.597
0.562 0.562
0.554 0.554
0.650 0.650
0.220 0.220
0.210 0.210
0.030 0.030
0.015 0.015
0.040 0.040
0.030 0.030

0.112-40
0.112-40
UNC (4)
UNC (4)
0.1120
0.1115 0.1115
0.1085 0.1085
0.050
4-400.1120
UNC
0.138-32
0.138-32
UNC (6)
UNC (6)
0.1380
0.1380
0.1375 0.1375
0.1345 0.1345
0.063
6-32 UNC
0.164-32
0.164-32
UNC (8)
UNC (8)
0.1640
0.1640
0.1635 0.1635
0.1605 0.1605
0.063
8-32 UNC

0.190-32
0.190-32
UNF (10)
UNF (10)
0.1900
0.1900
0.1895 0.1895
0.1865 0.1865
0.063
10-32 UNF

© BSI 2006

size

Nominal
NominalNominal
thread size
Alternative

Width across
Widthflats
across Width
flats
Width
Thickness
Thickness
of head ofRadius
head under
Radius

bolt
under bolt
Depth ofDepth of

Min.
Diameter
Diameter
of
2of
2Min.
size
Decimal
Decimal
size
thread
across across
length
plain portion
plain portion
of pitch
of Thread
equivalent
equivalent
heat
heat
chamferchamfer
pitch oflength of
 shank shank
runout
screwedscrewed

of reference
nominal
of nominal
corners corners

1

Table 2Table
— Dimensions
2 — Dimensions
of bolts
of bolts

Licensed
Licensed
Copy: Miss
Copy:
Lucie
MissCarter,
Lucie Carter,
British Standards
British Standards
Institution,
Institution,
07/08/2012
07/08/2012
09:25, Uncontrolled
09:25, Uncontrolled
Copy, (c)
Copy,

The (c)
British
The Standards
British Standards
Institution
Institution
2012 2012

BS 4A 104:2002

BS 4A 104:2002
BS 4A 104:2002+A2:2012

5

5
5


6
b)

M

M

E

Figure 2 — Bearing length L, clamping length M and overall length E (see Table 3)

a)

L

L

E

Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

© The British Standards Institution
© BSI 2012
2006


© BSI
The 2006
British Standards Institution 2012
©

1.1
1.2
1.3
1.4
1.5

1.6

1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5

2.6
2.7

11A
12A
13A
14A
15A

16A
17A
18A
19A
20A
21A
22A
23A
24A
25A

26A
27A

2.680
2.780

1.680
1.780
1.880
1.980
2.080
2.180
2.280
2.380
2.480
2.580

1.180
1.280
1.380
1.480
1.580

0.680
0.780
0.880
0.980
1.080

3.00

3.10

2.00
2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.90

1.50
1.60
1.70
1.80
1.90

1.00
1.10
1.20
1.30
1.40

0.45
0.50
0.60
0.70
0.80

0.90

in

E
+0.04
–0

26B
27B
28B

16B
17B
18B
19B
20B
21B
22B
23B
24B
25B

11B
12B
13B
14B
15B

6B

7B
8B
9B
10B

B
1B
2B
3B
4B
5B

Part No.

2.6
2.7
2.8

1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5

1.1

1.2
1.3
1.4
1.5

0.6
0.7
0.8
0.9
1.0

0.05
0.1
0.2
0.3
0.4
0.5

in

min.

L*

2.693
2.793
2.893

1.693
1.793

1.893
1.993
2.093
2.193
2.293
2.393
2.493
2.593

1.193
1.293
1.393
1.493
1.593

0.693
0.793
0.893
0.993
1.093

0.143
0.193
0.293
0.393
0.493
0.593

in

M
+0
– 0.03

No. 6-32 UNC

3.00
3.10
3.20

2.00
2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.90

1.50
1.60
1.70
1.80
1.90

1.00
1.10
1.20

1.30
1.40

0.45
0.50
0.60
0.70
0.80
0.90

in

E
+0.04
–0

26C
27C
28C

16C
17C
18C
19C
20C
21C
22C
23C
24C
25C

11C
12C
13C
14C
15C

6C
7C
8C
9C
10C

C
1C
2C
3C
4C
5C

Part No.

2.6
2.7
2.8

1.6
1.7
1.8
1.9

2.0
2.1
2.2
2.3
2.4
2.5

1.1
1.2
1.3
1.4
1.5

0.6
0.7
0.8
0.9
1.0

0.05
0.1
0.2
0.3
0.4
0.5

in

min.

L*

2.693
2.793
2.893

1.693
1.793
1.893
1.993
2.093
2.193
2.293
2.393
2.493
2.593

1.193
1.293
1.393
1.493
1.593

0.693
0.793
0.893
0.993
1.093

0.143

0.193
0.293
0.393
0.493
0.593

in

M
+0
– 0.03

No. 8-32 UNC

3.05
3.15
3.25

2.05
2.15
2.25
2.35
2.45
2.55
2.65
2.75
2.85
2.95

1.55

1.65
1.75
1.85
1.95

1.05
1.15
1.25
1.35
1.45

0.50
0.55
0.65
0.75
0.85
0.95

in

E
+0.04
–0

* See 5.3.

NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging.

0.6
0.7

0.8
0.9
1.0

6A
7A
8A
9A
10A

in

0.130
0.180
0.280
0.380
0.480
0.580

in

0.05
0.1
0.2
0.3
0.4
0.5

M
+0

– 0.03

L*

min.

A
1A
2A
3A
4A
5A

Part No.

No. 4-40 UNC

26D
27D
28D

16D
17D
18D
19D
20D
21D
22D
23D
24D

25D

11D
12D
13D
14D
15D

6D
7D
8D
9D
10D

D
1D
2D
3D
4D
5D

Part No.

Table 3 — Bearing length L, clamping length M and overall length E

2.6
2.7
2.8

1.6

1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5

1.1
1.2
1.3
1.4
1.5

0.6
0.7
0.8
0.9
1.0

0.05
0.1
0.2
0.3
0.4
0.5

in

min.

L*

2.693
2.793
2.893

1.693
1.793
1.893
1.993
2.093
2.193
2.293
2.393
2.493
2.593

1.193
1.293
1.393
1.493
1.593

0.693
0.793
0.893
0.993

1.093

0.143
0.193
0.293
0.393
0.493
0.593

in

M
+0
– 0.03

No. 10-32 UNF

3.10
3.20
3.30

2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.90

3.00

1.60
1.70
1.80
1.90
2.00

1.10
1.20
1.30
1.40
1.50

0.55
0.60
0.70
0.80
0.90
1.00

in

E
+0.04
–0

Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002

BS 4A 104:2002+A2:2012

77


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
No. 6-32 UNC
Part No.

L*
min.

in

M
+0
– 0.03
in

No. 8-32 UNC
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

No. 10-32 UNC
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03

in

E
+0.04
–0
in

29B
30B
31B
32B
33B

2.9
3.0
3.1
3.2
3.3

2.993
3.093
3.193
3.293
3.393

3.30
3.40
3.50
3.60
3.70

29C
30C
31C
32C
33C

2.9
3.0
3.1
3.2
3.3

2.993
3.093
3.193
3.293
3.393

3.35
3.45
3.55
3.65
3.75

29D
30D
31D
32D
33D

2.9
3.0
3.1
3.2
3.3

2.993
3.093
3.193
3.293
3.393

3.40
3.50
3.60
3.70
3.80

34B
35B
36B
37B
38B

3.4
3.5
3.6
3.7
3.8

3.493
3.593
3.693
3.793
3.893

3.80
3.90
4.00
4.10
4.20

34C
35C
36C
37C
38C

3.4
3.5
3.6
3.7
3.8

3.493
3.593
3.693
3.793
3.893

3.85
3.95
4.05
4.15
4.25

34D
35D
36D
37D
38D

3.4
3.5
3.6
3.7
3.8

3.493
3.593
3.693
3.793
3.893

3.90
4.00
4.10
4.20
4.30

39B
40B
41B
42B
43B

3.9
4.0
4.1
4.2
4.3

3.993
4.093
4.193
4.293
4.393

4.30
4.40
4.50
4.60
4.70

39C
40C
41C
42C
43C

3.9
4.0
4.1
4.2
4.3

3.993
4.093
4.193
4.293
4.393

4.35
4.45
4.55
4.65
4.75

39D
40D
41D
42D
43D

3.9
4.0
4.1
4.2
4.3

3.993
4.093
4.193
4.293
4.393

4.40
4.50
4.60
4.70
4.80

44B
45B
46B
47B
48B

4.4
4.5
4.6
4.7
4.8

4.493
4.593
4.693
4.793
4.893

4.80
4.90
5.00
5.10
5.20

44C
45C
46C
47C
48C

4.4
4.5
4.6
4.7
4.8

4.493
4.593
4.693
4.793
4.893

4.85
4.95
5.05
5.15
5.25

44D
45D
46D
47D
48D

4.4
4.5
4.6
4.7
4.8

4.493
4.593
4.693
4.793
4.893

4.90
5.00
5.10
5.20
5.30

49B
50B
51B
52B
53B

4.9
5.0
5.1
5.2
5.3

4.993
5.093
5.193
5.293
5.393

5.30
5.40
5.50
5.60
5.70

49C
50C
51C
52C
53C

4.9
5.0
5.1
5.2
5.3

4.993
5.093
5.193
5.293
5.393

5.35
5.45
5.55
5.65
5.75

49D
50D
51D
52D
53D

4.9
5.0
5.1
5.2
5.3

4.993
5.093
5.193
5.293
5.393

5.40
5.50
5.60
5.70
5.80

54D
55D
56D
57D
58D

5.4
5.5
5.6
5.7
5.8

5.493
5.593
5.693
5.793
5.893

5.90
6.00
6.10
6.20
6.30

59D
60D

5.9
6.0

5.993
6.093

6.40
6.50

* See 5.3.

8

© The British Standards Institution
© BSI2012
2006


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
BS 4A 104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
 in UNF
Part No.

L*
min.

in

E
1E
2E
3E
4E
5E

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

0.05
0.1
0.2
0.3
0.4
0.5

0.151
0.201
0.301
0.401
0.501
0.601

0.65
0.70
0.80
0.90
1.00
1.10

½G
1G
2G
3G
4G
5G

6E
7E
8E
9E
10E

0.6
0.7
0.8
0.9
1.0

0.701
0.801
0.901
1.001
1.101

1.20
1.30
1.40
1.50
1.60

11E
12E
13E
14E
15E

1.1
1.2
1.3
1.4
1.5

1.201
1.301
1.401
1.501
1.601

16E
17E
18E
19E
20E

1.6
1.7
1.8
1.9
2.0

21E
22E
23E
24E
25E

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

E
+0.04
–0
in

0.05

0.1
0.2
0.3
0.4
0.5

0.163
0.213
0.313
0.413
0.513
0.613

0.70
0.75
0.85
0.95
1.05
1.15

1J
2J
3J
4J
5J

0.1
0.2
0.3
0.4

0.5

0.213
0.313
0.413
0.513
0.613

0.85
0.95
1.05
1.15
1.25

6G
7G
8G
9G
10G

0.6
0.7
0.8
0.9
1.0

0.713
0.813
0.913
1.013

1.113

1.25
1.35
1.45
1.55
1.65

6J
7J
8J
9J
10J

0.6
0.7
0.8
0.9
1.0

0.713
0.813
0.913
1.013
1.113

1.35
1.45
1.55
1.65

1.75

1.70
1.80
1.90
2.00
2.10

11G
12G
13G
14G
15G

1.1
1.2
1.3
1.4
1.5

1.213
1.313
1.413
1.513
1.613

1.75
1.85
1.95
2.05

2.15

11J
12J
13J
14J
15J

1.1
1.2
1.3
1.4
1.5

1.213
1.313
1.413
1.513
1.613

1.85
1.95
2.05
2.15
2.25

1.701
1.801
1.901
2.001

2.101

2.20
2.30
2.40
2.50
2.60

16G
17G
18G
19G
20G

1.6
1.7
1.8
1.9
2.0

1.713
1.813
1.913
2.013
2.113

2.25
2.35
2.45
2.55

2.65

16J
17J
18J
19J
20J

1.6
1.7
1.8
1.9
2.0

1.713
1.813
1.913
2.013
2.113

2.35
2.45
2.55
2.65
2.75

2.1
2.2
2.3
2.4

2.5

2.201
2.301
2.401
2.501
2.601

2.70
2.80
2.90
3.00
3.10

21G
22G
23G
24G
25G

2.1
2.2
2.3
2.4
2.5

2.213
2.313
2.413
2.513

2.613

2.75
2.85
2.95
3.05
3.15

21J
22J
23J
24J
25J

2.1
2.2
2.3
2.4
2.5

2.213
2.313
2.413
2.513
2.613

2.85
2.95
3.05
3.15

3.25

26E
27E
28E
29E
30E

2.6
2.7
2.8
2.9
3.0

2.701
2.801
2.901
3.001
3.101

3.20
3.30
3.40
3.50
3.60

26G
27G
28G
29G

30G

2.6
2.7
2.8
2.9
3.0

2.713
2.813
2.913
3.013
3.113

3.25
3.35
3.45
3.55
3.65

26J
27J
28J
29J
30J

2.6
2.7
2.8
2.9

3.0

2.713
2.813
2.913
3.013
3.113

3.35
3.45
3.55
3.65
3.75

31E
32E
33E
34E
35E

3.1
3.2
3.3
3.4
3.5

3.201
3.301
3.401
3.501

3.601

3.70
3.80
3.90
4.00
4.10

31G
32G
33G
34G
35G

3.1
3.2
3.3
3.4
3.5

3.213
3.313
3.413
3.513
3.613

3.75
3.85
3.95
4.05

4.15

31J
32J
33J
34J
35J

3.1
3.2
3.3
3.4
3.5

3.213
3.313
3.413
3.513
3.613

3.85
3.95
4.05
4.15
4.25

NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging.

* See 5.3.

© BSI
The 2006
British Standards Institution 2012
©

9


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
 in UNF
Part No.

L*
min.

in

M
+0
– 0.03
in

 in UNF
E
+0.04

–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

E
+0.04
–0
in

36E
37E
38E
39E
40E

3.6
3.7
3.8
3.9
4.0

3.701
3.801
3.901
4.001
4.101

4.20
4.30

4.40
4.50
4.60

36G
37G
38G
39G
40G

3.6
3.7
3.8
3.9
4.0

3.713
3.813
3.913
4.013
4.113

4.25
4.35
4.45
4.55
4.65

36J
37J

38J
39J
40J

3.6
3.7
3.8
3.9
4.0

3.713
3.813
3.913
4.013
4.113

4.35
4.45
4.55
4.65
4.75

41E
42E
43E
44E
45E

4.1
4.2

4.3
4.4
4.5

4.201
4.301
4.401
4.501
4.601

4.70
4.80
4.90
5.00
5.10

41G
42G
43G
44G
45G

4.1
4.2
4.3
4.4
4.5

4.213
4.313

4.413
4.513
4.613

4.75
4.85
4.95
5.00
5.15

41J
42J
43J
44J
45J

4.1
4.2
4.3
4.4
4.5

4.213
4.313
4.413
4.513
4.613

4.85
4.95

5.05
5.15
5.25

46E
47E
48E
49E
50E

4.6
4.7
4.8
4.9
5.0

4.701
4.801
4.901
5.001
5.101

5.20
5.30
5.40
5.50
5.60

46G
47G

48G
49G
50G

4.6
4.7
4.8
4.9
5.0

4.713
4.813
4.913
5.013
5.113

5.25
5.35
5.45
5.55
5.65

46J
47J
48J
49J
50J

4.6
4.7

4.8
4.9
5.0

4.713
4.813
4.913
5.013
5.113

5.35
5.45
5.55
5.65
5.75

51E
52E
53E
54E
55E

5.1
5.2
5.3
5.4
5.5

5.201
5.301

5.401
5.501
5.601

5.70
5.80
5.90
6.00
6.10

51G
52G
53G
54G
55G

5.1
5.2
5.3
5.4
5.5

5.213
5.313
5.413
5.513
5.613

5.75
5.85

5.95
6.05
6.15

51J
52J
53J
54J
55J

5.1
5.2
5.3
5.4
5.5

5.213
5.313
5.413
5.513
5.613

5.85
5.95
6.05
6.15
6.25

56E
57E

58E
59E
60E

5.6
5.7
5.8
5.9
6.0

5.701
5.801
5.901
6.001
6.101

6.20
6.30
6.40
6.50
6.60

56G
57G
58G
59G
60G

5.6
5.7

5.8
5.9
6.0

5.713
5.813
5.913
6.013
6.113

6.25
6.35
6.45
6.55
6.65

56J
57J
58J
59J
60J

5.6
5.7
5.8
5.9
6.0

5.713
5.813

5.913
6.013
6.113

6.35
6.45
6.55
6.65
6.75

61G
62G
63G
64G
65G

6.1
6.2
6.3
6.4
6.5

6.213
6.313
6.413
6.513
6.613

6.75
6.85

6.95
7.05
7.15

61J
62J
63J
64J
65J

6.1
6.2
6.3
6.4
6.5

6.213
6.313
6.413
6.513
6.613

6.85
6.95
7.05
7.15
7.25

66G
67G

68G
69G
70G

6.6
6.7
6.8
6.9
7.0

6.713
6.813
6.913
7.013
7.113

7.25
7.35
7.45
7.55
7.65

66J
67J
68J
69J
70J

6.6
6.7

6.8
6.9
7.0

6.713
6.813
6.913
7.013
7.113

7.35
7.45
7.55
7.65
7.75

* See 5.3.

10

© The British Standards Institution
© BSI 2012
2006


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
BS 4A 104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
 in UNF
Part No.

L*
min.

in

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0

– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

E
+0.04
–0
in

1L
2L
3L

4L
5L

0.1
0.2
0.3
0.4
0.5

0.230
0.330
0.430
0.530
0.630

0.95
1.05
1.15
1.25
1.35

1N
2N
3N
4N
5N

0.1
0.2
0.3

0.4
0.5

0.230
0.330
0.430
0.530
0.630

1.05
1.15
1.25
1.35
1.45

1P
2P
3P
4P
5P

0.1
0.2
0.3
0.4
0.5

0.241
0.341
0.441

0.541
0.641

1.15
1.25
1.35
1.45
1.55

6L
7L
8L
9L
10L
11L
12L
13L
14L
15L

0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5

0.730
0.830
0.930
1.030
1.130
1.230
1.330
1.430
1.530
1.630

1.45
1.55
1.65
1.75
1.85
1.95
2.05
2.15
2.25
2.35

6N
7N
8N
9N
10N
11N
12N

13N
14N
15N

0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5

0.730
0.830
0.930
1.030
1.130
1.230
1.330
1.430
1.530
1.630

1.55
1.65
1.75
1.85

1.95
2.05
2.15
2.25
2.35
2.45

6P
7P
8P
9P
10P
11P
12P
13P
14P
15P

0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5

0.741

0.841
0.941
1.041
1.141
1.241
1.341
1.441
1.541
1.641

1.65
1.75
1.85
1.95
2.05
2.15
2.25
2.35
2.45
2.55

16L
17L
18L
19L
20L

1.6
1.7
1.8

1.9
2.0

1.730
1.830
1.930
2.030
2.130

2.45
2.55
2.65
2.75
2.85

16N
17N
18N
19N
20N

1.6
1.7
1.8
1.9
2.0

1.730
1.830
1.930

2.030
2.130

2.55
2.65
2.75
2.85
2.95

16P
17P
18P
19P
20P

1.6
1.7
1.8
1.9
2.0

1.741
1.841
1.941
2.041
2.141

2.65
2.75
2.85

2.95
3.05

21L
22L
23L
24L
25L

2.1
2.2
2.3
2.4
2.5

2.230
2.330
2.430
2.530
2.630

2.95
3.05
3.15
3.25
3.35

21N
22N
23N

24N
25N

2.1
2.2
2.3
2.4
2.5

2.230
2.330
2.430
2.530
2.630

3.05
3.15
3.25
3.35
3.45

21P
22P
23P
24P
25P

2.1
2.2
2.3

2.4
2.5

2.241
2.341
2.441
2.541
2.641

3.15
3.25
3.35
3.45
3.55

26L
27L
28L
29L
30L

2.6
2.7
2.8
2.9
3.0

2.730
2.830
2.930

3.030
3.130

3.45
3.55
3.65
3.75
3.85

26N
27N
28N
29N
30N

2.6
2.7
2.8
2.9
3.0

2.730
2.830
2.930
3.030
3.130

3.55
3.65
3.75

3.85
3.95

26P
27P
28P
29P
30P

2.6
2.7
2.8
2.9
3.0

2.741
2.841
2.941
3.041
3.141

3.65
3.75
3.85
3.95
4.05

31L
32L
33L

34L
35L

3.1
3.2
3.3
3.4
3.5

3.230
3.330
3.430
3.530
3.630

3.95
4.05
4.15
4.25
4.35

31N
32N
33N
34N
35N

3.1
3.2
3.3

3.4
3.5

3.230
3.330
3.430
3.530
3.630

4.05
4.15
4.25
4.35
4.45

31P
32P
33P
34P
35P

3.1
3.2
3.3
3.4
3.5

3.241
3.341
3.441

3.541
3.641

4.15
4.25
4.35
4.45
4.55

* See 5.3.
© BSI
The 2006
British Standards Institution 2012
©

11
11


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
 in UNF
Part No.

L*
min.

in

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

 in UNF
E
+0.04

–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

E
+0.04
–0
in

36L
37L
38L
39L
40L

3.6
3.7
3.8

3.9
4.0

3.730
3.830
3.930
4.030
4.130

4.45
4.55
4.65
4.75
4.85

36N
37N
38N
39N
40N

3.6
3.7
3.8
3.9
4.0

3.730
3.830
3.930

4.030
4.130

4.55
4.65
4.75
4.85
4.95

36P
37P
38P
39P
40P

3.6
3.7
3.8
3.9
4.0

3.741
3.841
3.941
4.041
4.141

4.65
4.75
4.85

4.95
5.05

41L
42L
43L
44L
45L

4.1
4.2
4.3
4.4
4.5

4.230
4.330
4.430
4.530
4.630

4.95
5.05
5.15
5.25
5.35

41N
42N
43N

44N
45N

4.1
4.2
4.3
4.4
4.5

4.230
4.330
4.430
4.530
4.630

5.05
5.15
5.25
5.35
5.45

41P
42P
43P
44P
45P

4.1
4.2
4.3

4.4
4.5

4.241
4.341
4.441
4.541
4.641

5.15
5.25
5.35
5.45
5.55

46L
47L
48L
49L
50L

4.6
4.7
4.8
4.9
5.0

4.730
4.830
4.930

5.030
5.130

5.45
5.55
5.65
5.75
5.85

46N
47N
48N
49N
50N

4.6
4.7
4.8
4.9
5.0

4.730
4.830
4.930
5.030
5.130

5.55
5.65
5.75

5.85
5.95

46P
47P
48P
49P
50P

4.6
4.7
4.8
4.9
5.0

4.741
4.841
4.941
5.041
5.141

5.65
5.75
5.85
5.95
6.05

51L
52L
53L

54L
55L

5.1
5.2
5.3
5.4
5.5

5.230
5.330
5.430
5.530
5.630

5.95
6.05
6.15
6.25
6.35

51N
52N
53N
54N
55N

5.1
5.2
5.3

5.4
5.5

5.230
5.330
5.430
5.530
5.630

6.05
6.15
6.25
6.35
6.45

51P
52P
53P
54P
55P

5.1
5.2
5.3
5.4
5.5

5.241
5.341
5.441

5.541
5.641

6.15
6.25
6.35
6.45
6.55

56L
57L
58L
59L

5.6
5.7
5.8
5.9

5.730
5.830
5.930
6.030

6.45
6.55
6.65
6.75

56N

57N
58N
59N

5.6
5.7
5.8
5.9

5.730
5.830
5.930
6.030

6.55
6.65
6.75
6.85

56P

5.6

5.741

6.65

60L
61L
62L

63L
64L

6.0
6.1
6.2
6.3
6.4

6.130
6.230
6.330
6.430
6.530

6.85
6.95
7.05
7.15
7.25

60N
61N
62N
63N
64N

6.0
6.1
6.2

6.3
6.4

6.130
6.230
6.330
6.430
6.530

6.95
7.05
7.15
7.25
7.35

65L
66L
67L
68L
69L

6.5
6.6
6.7
6.8
6.9

6.630
6.730
6.830

6.930
7.030

7.35
7.45
7.55
7.65
7.75

65N
66N
67N
68N
69N

6.5
6.6
6.7
6.8
6.9

6.630
6.730
6.830
6.930
7.030

7.45
7.55
7.65

7.75
7.85

70L

7.0

7.130

7.85

70N

7.0

7.130

7.95

NOTE Bolts below the heavy line may not be readily available in large quantities because of limitations in manufacture by forging.

* See 5.3.

12

© The British Standards Institution
© BSI 2012
2006

Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
BS 4A 104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
 in UNF
Part No.

L*
min.

in

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

E
+0.04
–0

in

1Q
2Q
3Q
4Q
5Q

0.1
0.2
0.3
0.4
0.5

0.241
0.341
0.441
0.541
0.641

1.25
1.35
1.45
1.55
1.65

1S
2S
3S
4S

5S

0.1
0.2
0.3
0.4
0.5

0.255
0.355
0.455
0.555
0.655

1.45
1.55
1.65
1.75
1.85

1U
2U
3U
4U
5U

0.1
0.2
0.3
0.4

0.5

0.273
0.373
0.473
0.573
0.673

1.65
1.75
1.85
1.95
2.05

6Q
7Q
8Q
9Q
10Q

0.6
0.7
0.8
0.9
1.0

0.741
0.841
0.941
1.041

1.141

1.75
1.85
1.95
2.05
2.15

6S
7S
8S
9S
10S

0.6
0.7
0.8
0.9
1.0

0.755
0.855
0.955
1.055
1.155

1.95
2.05
2.15
2.25

2.35

6U
7U
8U
9U
10U

0.6
0.7
0.8
0.9
1.0

0.773
0.873
0.973
1.073
1.173

2.15
2.25
2.35
2.45
2.55

11Q
12Q
13Q
14Q

15Q

1.1
1.2
1.3
1.4
1.5

1.241
1.341
1.441
1.541
1.641

2.25
2.35
2.45
2.55
2.65

11S
12S
13S
14S
15S

1.1
1.2
1.3
1.4

1.5

1.255
1.355
1.455
1.555
1.655

2.45
2.55
2.65
2.75
2.85

11U
12U
13U
14U
15U

1.1
1.2
1.3
1.4
1.5

1.273
1.373
1.473
1.573

1.673

2.65
2.75
2.85
2.95
3.05

16Q
17Q
18Q
19Q
20Q

1.6
1.7
1.8
1.9
2.0

1.741
1.841
1.941
2.041
2.141

2.75
2.85
2.95
3.05

3.15

16S
17S
18S
19S
20S

1.6
1.7
1.8
1.9
2.0

1.755
1.855
1.955
2.055
2.155

2.95
3.05
3.15
3.25
3.35

16U
17U
18U
19U

20U

1.6
1.7
1.8
1.9
2.0

1.773
1.873
1.973
2.073
2.173

3.15
3.25
3.35
3.45
3.55

21Q
22Q
23Q
24Q
25Q

2.1
2.2
2.3
2.4

2.5

2.241
2.341
2.441
2.541
2.641

3.25
3.35
3.45
3.55
3.65

21S
22S
23S
24S
25S

2.1
2.2
2.3
2.4
2.5

2.255
2.355
2.455
2.555

2.655

3.45
3.55
3.65
3.75
3.85

21U
22U
23U
24U
25U

2.1
2.2
2.3
2.4
2.5

2.273
2.373
2.473
2.573
2.673

3.65
3.75
3.85
3.95

4.05

* See 5.3.

© BSI
The 2006
British Standards Institution 2012
©

13


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
 in UNF
Part No.

L*
min.

in

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

in

M
+0
– 0.03
in

E
+0.04
–0
in

26Q
27Q
28Q
29Q
30Q

2.6
2.7
2.8
2.9
3.0

2.741
2.841
2.941
3.041

3.141

3.75
3.85
3.95
4.05
4.15

26S
27S
28S
29S
30S

2.6
2.7
2.8
2.9
3.0

2.755
2.855
2.955
3.055
3.155

3.95
4.05
4.15
4.25

4.35

26U
27U
28U
29U
30U

2.6
2.7
2.8
2.9
3.0

2.773
2.873
2.973
3.073
3.173

4.15
4.25
4.35
4.45
4.55

31Q
32Q
33Q
34Q

35Q

3.1
3.2
3.3
3.4
3.5

3.241
3.341
3.441
3.541
3.641

4.25
4.35
4.45
4.55
4.65

31S
32S
33S
34S
35S

3.1
3.2
3.3
3.4

3.5

3.255
3.355
3.455
3.555
3.655

4.45
4.55
4.65
4.75
4.85

31U
32U
33U
34U
35U

3.1
3.2
3.3
3.4
3.5

3.273
3.373
3.473
3.573

3.673

4.65
4.75
4.85
4.95
5.05

36Q
37Q
38Q
39Q
40Q

3.6
3.7
3.8
3.9
4.0

3.741
3.841
3.941
4.041
4.141

4.75
4.85
4.95
5.05

5.15

36S
37S
38S
39S
40S

3.6
3.7
3.8
3.9
4.0

3.755
3.855
3.955
4.055
4.155

4.95
5.05
5.15
5.25
5.35

36U
37U
38U
39U

40U

3.6
3.7
3.8
3.9
4.0

3.773
3.873
3.973
4.073
4.173

5.15
5.25
5.35
5.45
5.55

41Q
42Q
43Q
44Q
45Q

4.1
4.2
4.3
4.4

4.5

4.241
4.341
4.441
4.541
4.641

5.25
5.35
5.45
5.55
5.65

41S
42S
43S
44S
45S

4.1
4.2
4.3
4.4
4.5

4.255
4.355
4.455
4.555

4.655

5.45
5.55
5.65
5.75
5.85

41U
42U
43U
44U
45U

4.1
4.2
4.3
4.4
4.5

4.273
4.373
4.473
4.573
4.673

5.65
5.75
5.85
5.95

6.05

46Q
47Q
48Q
49Q
50Q

4.6
4.7
4.8
4.9
5.0

4.741
4.841
4.941
5.041
5.141

5.75
5.85
5.95
6.05
6.15

46S
47S
48S
49S

50S

4.6
4.7
4.8
4.9
5.0

4.755
4.855
4.955
5.055
5.155

5.95
6.05
6.15
6.25
6.35

46U
47U
48U
49U
50U

4.6
4.7
4.8
4.9

5.0

4.773
4.873
4.973
5.073
5.173

6.15
6.25
6.35
6.45
6.55

51Q
52Q
53Q
54Q
55Q

5.1
5.2
5.3
5.4
5.5

5.241
5.341
5.441
5.541

5.641

6.25
6.35
6.45
6.55
6.65

51S
52S
53S
54S
55S

5.1
5.2
5.3
5.4
5.5

5.255
5.355
5.455
5.555
5.655

6.45
6.55
6.65
6.75

6.85

51U
52U
53U
54U
55U

5.1
5.2
5.3
5.4
5.5

5.273
5.373
5.473
5.573
5.673

6.65
6.75
6.85
6.95
7.05

* See 5.3.

14

© The British Standards Institution
© BSI 2012
2006


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
BS 4A 104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
 in UNF
Part No.

L*
min.

in

56Q
57Q
58Q
59Q
60Q

5.6
5.7
5.8
5.9
6.0

M
+0
– 0.03
in

5.741
5.841
5.941
6.041
6.141

 in UNF
E
+0.04
–0

Part No.

in

6.75
6.85
6.95
7.05
7.15

L*
min.

in

56S

5.6

M
+0
– 0.03
in

5.755

 in UNF
E
+0.04
–0

Part No.

L*
min.

in

6.95

in

56U

5.6

M
+0
– 0.03
in

5.773

E
+0.04
–0
in

7.15

* See 5.3.

© BSI
The 2006
British Standards Institution 2012
©

15
15


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A 104:2002
104:2002+A2:2012

Table 3 — Bearing length L, clamping length M and overall length E (continued)
1 in UNF
L*

Part No.

min.

M
+0
– 0.03

in

E
+0.04
–0

in

L*

Part No.

min.

in

in

M
+0
– 0.03

E
+0.04
–0

in

in

1W
2W
3W
4W
5W

0.1
0.2
0.3
0.4
0.5

0.297
0.397
0.497

0.597
0.697

1.85
1.95
2.05
2.15
2.25

31W
32W
33W
34W
35W

3.1
3.2
3.3
3.4
3.5

3.297
3.397
3.497
3.597
3.697

4.85
4.95
5.05

5.15
5.25

6W
7W
8W
9W
10W

0.6
0.7
0.8
0.9
1.0

0.797
0.897
0.997
1.097
1.197

2.35
2.45
2.55
2.65
2.75

36W
37W
38W

39W
40W

3.6
3.7
3.8
3.9
4.0

3.797
3.897
3.997
4.097
4.197

5.35
5.45
5.55
5.65
5.75

11W
12W
13W
14W
15W

1.1
1.2
1.3

1.4
1.5

1.297
1.397
1.497
1.597
1.697

2.85
2.95
3.05
3.15
3.25

41W
42W
43W
44W
45W

4.1
4.2
4.3
4.4
4.5

4.297
4.397
4.497

4.597
4.697

5.85
5.95
6.05
6.15
6.25

16W
17W
18W
19W
20W

1.6
1.7
1.8
1.9
2.0

1.797
1.897
1.997
2.097
2.197

3.35
3.45
3.55

3.65
3.75

46W
47W
48W
49W
50W

4.6
4.7
4.8
4.9
5.0

4.797
4.897
4.997
5.097
5.197

6.35
6.45
6.55
6.65
6.75

21W
22W
23W

24W
25W

2.1
2.2
2.3
2.4
2.5

2.297
2.397
2.497
2.597
2.697

3.85
3.95
4.05
4.15
4.25

51W
52W
53W
54W
55W

5.1
5.2
5.3

5.4
5.5

5.297
5.397
5.497
5.597
5.697

6.85
6.95
7.05
7.15
7.25

26W
27W
28W
29W
30W

2.6
2.7
2.8
2.9
3.0

2.797
2.897
2.997

3.097
3.197

4.35
4.45
4.55
4.65
4.75

56W
57W
58W
59W
60W

5.6
5.7
5.8
5.9
6.0

5.797
5.897
5.997
6.097
6.197

7.35
7.45
7.55

7.65
7.75

* See 5.3.

16

© The British Standards Institution
© BSI 2012
2006


Licensed Copy: Miss Lucie Carter, British Standards Institution, 07/08/2012 09:25, Uncontrolled Copy, (c) The British Standards Institution 2012

BS 4A
4A 104:2002
104:2002
BS
+A2:2012

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