Bsi bs a 310 1995 (1999) iso 3186 1994

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BRITIS H S TAND ARD AE RO S PAC E S E RIE S

BS A 3 1 0 : 1 995
IS O 3 1 86: 1 994

Bolts, large
b ihexagonal head,
normal shank, short or
medium length MJ
threads, metallic
material, coated or
uncoated, strength
classes 1 2 5 0 MPa
to 1 80 0 Mpa —
D imensions


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BS A 310:1995

Committees responsible for this
British Standard
The p rep aration of this Britis h S tandard was entrus ted to Technical
C ommittee AC E /1 2 , Aerosp ace fas teners and fas tening s ystems , up on which
the following b odies were rep res ented:

British Indus trial Fasteners Federation
Minis try of D efence

S ociety of Britis h Aeros p ace C omp anies Ltd.
The Ass ociation of E lectronics , Telecommunications and Bus iness E quip ment
Industries

This Britis h S tandard, having
b een p rep ared under the
direction of the E ngineering
S ector Board, was p ub lis hed
under the authority of the
S tandards Board and comes
into effect on

Amendments issued since publication

1 5 May 1 995

© BS I 0 8- 1 9 9 9

The following BS I references
relate to the work on this
s tandard:
C om mittee reference AC E /1 2
D raft for comment 9 2 /845 5 0 D C

ISBN 0 580 24069 X

Amd. No.

D ate

C omments


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BS A 310:1995

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 08- 1 999

Inside front cover

1
2
Inside back cover

i


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BS A 31 0:1 995

National foreword

This British Standard has been prepared by Technical Committee ACE/1 2. It is
identical with ISO 31 86: 1 994,

Aeros p ace — Bolts , large b ihexagonal head, no rm al

shank, sho rt o r m edium length MJ threads, m etallic m aterial, coated or unco ated,
strength classes 1

250 MPa to 1

800 MPa — Dim ensions,

published by the

International Organization for Standardization (ISO).
Cross-references
International Standard

C orresponding British Standard

ISO 286- 2: 1 988

BS EN 20286
Part 2: 1 992

ISO system of lim its and fits

Tab les of standard to lerance grades and lim it

deviatio ns for holes and shafts

(Identical)
ISO 3353: 1 992

BS 2A 231 : 1 993

Rolled threads for b olts.

Lead and

runout req uirem ents

(Identical)
ISO 5855- 2: 1 988

BS 6293

Aerosp ace — MJ threads

Part 2: 1 994

Lim it dim ensions for b olts and nuts

(Identical)
ISO 791 3: 1 994

BS 2A 296: 1 995

Bo lts and screw s , m etric — To lerances o f

fo rm and p os ition

(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 to 4, 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 08- 1 999


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BS A 310:1995

1 Scope

IS O 2 86- 2 : 1 9 88, ISO s ystem of lim its and fits —
Part 2: Tab les o f standard tolerance grades and

This International S tandard sp ecifies the
lim it deviations for holes and shafts .

dimens ions of large b ihexagonal head b olts, with

clos e or large tolerance normal shank, and s hort or
medium length MJ threads , in metallic material,

IS O 3 3 5 3 : 1 992 , Aero sp ace — Rolled threads fo r
b olts — Lead and runout req uirem ents.

coated or uncoated, with s trength

IS O 4095 : 1 978, Fasteners fo r aerosp ace

clas ses 1 2 5 0 MPa to 1 80 0 MPa.

construction — Bi- hexago nal w renching
configuration.

It is intended for the drawing up of aerosp ace

IS O 5 85 5 - 2 : 1 9 88, Aeros p ace — MJ threads —

p roduct s tandards .

Part 2: Lim it dim ensions for b olts and nuts.

2 Normative references

IS O 7 91 3 : 1 994, Aeros p ace — Bolts and screw s,

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

m etric — Tolerances o f fo rm and p os ition.

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
Tolerances of form and p osition are sp ecified in
indicated b elow. Memb ers of IE C and IS O maintain
IS O 79 1 3 .
registers of currently valid International S tandards.

.

Figure 1

© BS I 0 8- 1 99 9

1

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BS A 3 1 0 : 1 995

Tab le 1

D1
C o ate d b o lts
D iame te r
co d e

a
Thre ad

no m.

0 60

0 70
0 80
1 00
1 20
1 40
1 60
1 80
200
220
240

2

MJ5 × 0,8 – 4h6h
MJ6 × 1 – 4h6h
MJ7 × 1 – 4h6h
MJ8 × 1 – 4h6h
MJ10 × 1,25 – 4h6h
MJ12 × 1,25 – 4h6h
MJ14 × 1,5 – 4h6h
MJ16 × 1,5 – 4h6h
MJ18 × 1,5 – 4h6h
MJ20 × 1,5 – 4h6h
MJ22 × 1,5 – 4h6h
MJ24 × 2 – 4h6h

5
6
7
8
10
12
14
16
18
20
22
24

b o lts

to l.

clo se

050

Unco ate d

large

clo se

D4

D5

large

+1
0

± 0,5

min.

min.

2,5 3,4
3,2 4,2

–0,013

–0,038

–0,020
–0,045

D3

D6

D7

D8

to l.

–0,010
–0,035

–0,016
–0,041

D2

h12 b

f7 b

3,9
4,5
6,1

7,7
h12 b
10,3
11,9
14,5
16
18,6
21,2

5,2
6,2
7,9
9,8
11,5
13,5
15,5
17,5
19,5
20,9

max. H13 b H13 b

6,8 9,5 10,3 1
7,8 11
11,8
8,8 12,5 13,3 1,4
9,8 14
14,8
11,8 17,3 18,3
13,7 20,9 22

16,7 23,9 25
18,6 27,4 28,5
1,6
21,6 30,4 31,5
23,6 33,4 34,5
26,6 36,4 37,5
29,6 39,4 40,5

1,5
1,9
2,4
3

3,8

© BSI 08-1999


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BS A 31 0:1 995

Table 1

H

K

min.

h15 b

Diameter

L1 c

code

L2

L3

Thread

Thread

short

050
060
070
080
1 00
1 20
1 40
1 60
1 80
200
220
240

a In

1,5
1,7
1,9
2,1
2,5
2,9
3,3
3,7
4,1
4,5
4,9
5,3

7,4
8,4
9,2
9,8
11,6
12,9
14,3
15,8
17,1
18,6
19,9
21,9

3 to 50
3 to 60

4 to 70
4 to 80
5 to 100
6 to 120
7 to 140
8 to 160
9 to 180
10 to 200
11 to 220
12 to 240

1 250

9
10
11
11,5
14,5
16
19
20,5
22,5
24,5
26
29,5

R1

S

T

medium
strength class (MPa)

± 0,2

P

12
14
15
16,5
20,5
22,5
26
28,5
31
33,5
36
41

dash
number

short medium

> 1 250

12,5

15
16
17
21
23,5
27,5
30
33
35,5
38
43,5

Wrenching

6

7,5
8,5
7
9,5
7,5 10,5
9 13
10 14,5
12 17
13 18,5
14,5 21
15 22,5
16 24
17,5 26,5

5,3
6,1
6,7
7,2
8,5
9,6
10,8
12,4
13,9
15,3
16,8
18,3

0
– 0,2

+ 0,4
0

0,8

3,3
3,8
4,2
4,6
5,5
6,4
7,1
8,4
9,4

10,5
11,6
12,7

1
1,2
1,4

1,8

d

min.

2,8
3,5
3,8
3,9
4,2
4,5
5,1
5,3
6,1
6,6
7,4
8,2

07
08
09

10
12
14
17
19
22
24
27
30

conformity with ISO 5855-2, except for the maximum major diameter “d” of bolts with a close tolerance on D1 , which shall be
D
– 0,025.

equal to 1 min.
b See ISO 286-2.
c Increments:

1 for L1 u 30
2 for 30 < L 1 u 100
4 for L1 > 100
If greater lengths are required, they shall be chosen using these increments.
d In conformity with ISO 4095 over T min.

© BSI 08-1999

3


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4

blank


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List of references

See national foreword.

© BSI 08- 1 999

BS A 310:1995


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BS A 310:1995
ISO 3186:1994

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