Bsi bs a 304 1994 (2000) iso 3203 1993

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BRITIS H S TAND ARD

BS A 3 0 4 : 1 994
IS O 3 2 0 3 : 1 993

Bolts, normal
b ihexagonal head,
normal or pitch
diameter shank, long
length MJ threads,
metallic material,
coated or uncoated,
strength classes less
than or equal
to 1 1 0 0 MPa —
D imensions


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BS A 304:1994

Committees responsible for this
British Standard
The preparation of this British Standard was entrusted by the Aerospace
Standards Policy Committee (ACE/- ) to Technical Committee ACE/1 2, upon
which the following bodies were represented:
The Association of Electronics, Telecommunications and Business Equipment
Industries

British Industrial Fasteners Federation
Ministry of Defence
Society of British Aerospace Companies Ltd.

This British Standard, having
been prepared under the
direction of the Aerospace
Standards Policy Committee,
was published under the
authority of the Standards
Board and comes into
effect on

Amendments issued since publication

1 5 August 1 994
© BSI 01 - 2000

The following BSI references
relate to the work on this
standard:
Committee reference ACE/1 2
Draft for comment 90/78994 DC

ISBN 0 580 23218 2

Amd. No.

Date

Comments


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BS A 304:1994

Contents
Page
Committees responsib le
National foreword

ii

1

Scope

1

2

Normative references

1

3

C onfiguration and dimensions

1

Figure 1
Table 1
List of references

© BSI 01 - 2 000

Inside front cover

1
2
Inside back cover

i


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BS A 304:1 994

National foreword

This British Standard has been prepared under the direction of the Aerospace
Standards Policy Committee. It is identical with ISO 3203: 1 993
Bolts,

no rm al b ihexago nal head,

MJ threads ,

eq ual to 1

m etallic m aterial,

Aeros p ace —

no rm al or p itch diam eter shank,

coated or uncoated,

1 00 MPa — Dim ens ions

long length

strength clas ses less than or

, published by the International Organization

for Standardization (ISO).
Cross-references
International Standard

Corresponding British Standard

ISO 286- 2: 1 988

BS EN 20286
Part 2: 1 992

ISO s ystem of lim its and fits

Tab les of standard tolerance grades and

lim it dev iatio ns for holes and shafts

(Identical)
ISO 3353: 1 992

BS 2A 231 : 1 993

Rolled threads fo r b olts.

runout req uirem ents

Lead and

.

(Identical)
ISO 5855- 2: 1 988

BS 6293

Aero sp ace — MJ threads

Part 2: 1 994

Lim it dim ensions for b o lts and nuts

(Identical)

The Technical Committee has reviewed the provisions of ISO 4095: 1 978, to which
normative reference is made in the text, and has decided that they are acceptable
for use in conj unction with this standard.
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, an inside front cover, pages i and ii,
pages 1 and 2, an inside back cover and a back cover.
This standard has been updated (see copyright date) and may have had
amendments incorporated. This will be indicated in the amendment table on the
inside front cover.

ii

© BSI 01 - 2000


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BS A 304:1994

1 Scope

Memb ers of IE C and IS O maintain regis ters of
currently valid International S tandards .

This International S tandard sp ecifies the
dimens ions of normal b ihexagonal head b olts , with
normal or p itch diameter s hank, and long length MJ
threads , in metallic material, coated or uncoated,

IS O 2 86- 2 : 1 9 88,

ISO system of limits and fits —

Part 2: Tables of standard tolerance grades and
limit deviations for holes and shafts.
Aerospace — Rolled threads for

with s trength clas ses less than or equal

IS O 3 3 5 3 : 1 992 ,

to 1 1 00 MPa.

bolts — Lead and runout requirements.
Fasteners for aerospace

It is intended for the drawing up of aerosp ace

IS O 40 95 : 1 978,

p roduct s tandards .

construction — Bi-hexagonal wrenching
configuration.

2 Normative references

IS O 5 85 5 - 2 : 1 9 88,

The following s tandards contain p rovis ions which,
through reference in this text, constitute p rovis ions
of this International S tandard. At the time of
p ub lication, the editions indicated were valid. All
s tandards are sub j ect to revis ion, and p arties to

Aerospace — MJ threads —

Part 2: Limit dimensions for bolts and nuts.

3 Configuration and dimensions
S ee Figure 1 and Tab le 1 . D imensions and
tolerances are exp res s ed in millimetres . They are

agreements b ased on this International S tandard
are encouraged to inves tigate the p os s ib ility of

ap p licab le after any s urface coating, b ut b efore the
ap p lication of any lub ricant.

ap p lying the mos t recent editions of the s tandards
indicated b elow.

Figure 1
© BS I 0 1 - 2 00 0

1


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BS A 304:1994

Table 1

D1
Diameter
code

normal

Thread a

nom.

tol.

nom.

040

MJ4 × 0,7 – 4h6h

4

3,54

050
060
070
080
100
120

MJ5 × 0,8 – 4h6h
5
MJ6 × 1 – 4h6h
6
MJ7 × 1 – 4h6h
7
MJ8 × 1 – 4h6h
8
MJ10 × 1,25 – 4h6h 10
MJ12 × 1,25 – 4h6h 12

4,48
5,35
6,35
7,35
9,19
11,19

Diameter
code

H

K

L1 cde

L2cde

min.

h15 b

min.

max.

040
050
060
070
080
100

0,8
1
1,2
1,4
1,6
2

5,5
6,5
7,5
8,2
8,6
10,1

0,4
0,5

120

2,4

11,4

0,9

0,7
0,8

2
4

6

h12 b

D2

pitch diameter

L3

D3

+0,5
0

tol.

nom.

—
3,2
4,1
± 0,13
4,9
5,2
6,7
8

L 4e
nom.

D5

D6

min.

3

0
–0,5

5,8

7,5

3,4
4,2
5,2
6,2
7,9
9,8

6,8
7,8
8,8
± 0,5
9,8
11,8
13,7

8,3
9,8
11,3
12,8
15,7

18,8

R1
nom.

14
16
18
20
22
26

16 to 56
20 to 70
22 to 84
24 to 98
± 0,3
26 to 112
32 to 140

3,5
4,5
5,2
5,9
6,3
7,7

0,4
0,5

30

36 to 168

8,8

0,9

0,7

S

tol.

+0,4
0

8,3

1
9,1
10,6
12,1 1,4
13,6
16,7
1,6
19,9

T

Wrenching
dash
min. numberf

0
–0,2

—
2,5
2,8
3,3
3,7
4,7

2,5
2,8
3,5
3,8
3,9
4,2

06
07
08
09
10
12

0
–0,3

5,6

4,5

14

0,8

D7

min. max. H13 b

tol.

P
tol.

D4

a In

conformity with ISO 5855-2.
ISO 286-2.
c First length, corresponding to first L length.
4
d Conditions L min. and L max. cannot be obtained simultaneously.
1
2
e Increments:

2 for L4 u 100
4 for L4 > 100
If greater lengths are required, they shall be chosen using these increments.
f In conformity with ISO 4095 over T min.
b See

2

© BSI 01-2000


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List of references

See national foreword.

© BSI 01 - 2 000

BS A 304:1994


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BS A 304:1994
ISO 3203:1993

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