Bsi bs a 313 1997 (iso 12261 1996)

BRITISH STANDARD AEROSPACE SERIES BS A 313 1997 ISO 12261 1996 Aerospace — Screws, pan head, internal offset cruciform ribbed or unribbed drive, pitch diameter shank, long length MJ threads, metallic[.]

Aerospace —

ICS 4 0 0.2

This Bri sh Stan ard, ha ing

b en pre ared u der the

directon of the Eng ine ring

Sector Bo rd, was published

u der the authoriy of the

Stan ards Bo rd an comes

into efect on

1 Mar h 1 9

© BSI 0 -1 9

The folowing BSI references

relate to the work on this

stan ard:

Commi e reference ACE/12

Draft for comment 9 / 70 7 3 DC

The prep ration of this British Stand rd was entrusted to Tech ical

Commit e ACE/12, Aerosp ce fastener and fastening sy stems, upon which

the folowing bodies were represented:

British Industrial Fastener Fed eration

Ministry of Defence

Society of British Aerosp ce Comp nies

Am endm ents is ued sinc publ cation

Pag e

National foreword

This British Stand rd has be n prep red b Technical Commit e ACE/12 It is

id entical with ISO 1 261:19 6, A er ospa ce — Scr ews, pa n hea d , inter na l o fs t

cr ucifr m r ib ed o u r ib ed d r ive, pich d ia meter sha nk, long length MJ thr ea d ,

meta llc ma ter ia ls, coa ted o u coa ted , str ength cla ss s le s tha n o equa l

to 1100MPa — D imensions, publshed b the International Org anization for

Stand ard ization ( ISO)

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

Cros - referenc s

Publcation r f r ed to Cor esp nding British Stand rd

ISO 3 5 :19 2 BS 2A 231:19 3 R oled thr ea d s fr bols Lea d a nd

r unout r equir ements

( Id entical

ISO 5 5 -2:19 8 BS 629 A er ospa ce MJ thr ea d s

Part 2:19 4 Limi d imensions f r bol s a nd n ts

( Id entical

ISO 7 13:19 4 BS 2A 29 :19 5 B ols a nd s r ews, metr ic Toler a nc s o

f r m a nd posiion

( Id entical

Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g es i an i ,

p g es 1 and 2, an insid e b ck cov er and a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

amendments incorporated This wi l be ind icated in the amendment ta le on

1 Scope

This International Stand rd specifies the

d imensions of p n head s rews with internal ofset

c uciform rib ed or u rib ed d riv e, pitch diameter

shank an long leng th MJ threa s, in metal ic

material, coated or u coated, with streng th clas es

les than or equal to 110 MPa

This International Stand ard is a plca le to the

compiation of aerosp ce product stand rd s

2 Normative r f r nces

The fol owing stand ard s contain prov isions which,

throug h reference in this text, constitute prov isions

of this International Stand ard At the time of

publcation, the editions ind icated were v ald All

stand ards are subject to rev ision, and p rties to

ag re ments b sed on this International Stand rd

are encourag ed to inv estig ate the pos ibi ty of

a ply ing the most recent editions of the stand rds

indicated below Member of IEC and ISO maintain

reg ister of cur ently v ald International Stand ards

ISO 3 5 :19 2, A er ospa ce — R oled thr ea d s f r

bols — Lea d a nd r unout r equir ements

ISO 5 5 -2:19 8, A er ospa ce — MJ thr ea d s —

Pa r t2: Limi d imensions fr bols a nd n ts

ISO 7 13:19 4, A er ospa ce — B ols a nd s r ews,

metr ic — Toler a nc s o fr m a nd posiion

ISO 1427 :—

1)

A er ospa ce — Dr ive , inter na l, o fs t

cr ucif r m, r ib ed — Metr ic s r ie

ISO 1427 :—

1)

A er ospa ce — Dr ive , inter na l, o fs t

cr ucif r m — Metr ic s r ie

3 Config uration and dimensions

Se Fig ure 1 an Ta le 1 Dimensions and

tolerances are ex res ed in mi imetres They are

a plca le after any sur ace coating , but before the

a plcation of any lubricant

Tolerances of form an position are specified in

ISO7 13

1)

To b published

Fig ure 1

Ta le 1

Diam ete

co e

T r a a D

1 D

2 D

4

K

L

1 bcd

L

2 bcd

L

3 L

4 d

Drive

co e

± 0,1 m in nom tol nom

tol

m in

m ax

± 0,3 nom tol m ax.m in

4

R6

0 0 MJ ×1 – 4h6h 6,3 1 ,7 1 5,2 ± 0,54,2 0,7 2 2 to 9 0,7 2,8 0,7

6

a

In ac ordance wih ISO 5 5 -2

b

Fir t leng th coresp n ing to firt L

4 leng th

c

Con i ons L

1 min an L

2

ma can ot b o tained simultane usly

d

Inc ements:

2 for L

4

< 1 0

4 for L

4

> 1 0

e

In ac ord nce with ISO 1427 or ISO 1427

0

0,3 –

0

0,5 –

0

02 , –

0

0, –

0

0,3 –

0

0, –

B

3 9Ch isw i ckH i g hR oa

Lon don

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