Bsi bs 4a 169 2002 (2006)

BRITISH STANDARD AEROSPACE SERIES BS 4A 169 2002 Amendment No 1 Specification for aluminium alloy bolts (Unified hexagons and Unified threads) for aircraft ICS 49 030 20 BS 4A 169 2002 This British St[.]

A mend ment No 1

ICS 4 0 0.2

This Bri sh Stan ard, hav ing

b en pre ared u der the

directon of the Eng ine ring

Sector Policy an Strateg y

Commi e ,was published

u der the authoriy of the

Stan ards Policy an Strateg y

Commi e on 2 J n ary 0 2

© BSI 2 0

T he folowing BSI references

r elate to the work on this

stan ard:

Commi e reference AC /12

Draft for comment 0 /70 8 7 DC

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

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

folowing bodies were represented:

Civ il Aviation Authority ( Airworthines Div ision)

Confederation of British Forg er

Institute of Petr oleum

Ministry of Defence

Society of British Aerosp ce Comp nies Ltd

Am endm ents is ued sinc publcation

16 7 Ju e 20 6 Cor ections to Ta le 2

Pag e

Ta le 2 — Bearing len gth L, clamping length Mand overal leng th E 5

Figure 2 — Bearing leng th L, clamping leng th Mand overal leng th E

This Br itish Stand rd has be n prep red b Tech ical Commit e ACE/12 It is a

revision of BS3A16 :19 2 which is super eded and withdrawn

This revision of BS 3A16 refer to the relevant requiremen ts in BSA10 It

incorporates amendment 1 of BS 3A 16 an d up ates and revises material

specifications

NOT Fastener s man factured to pre ious edi ons of this sp cificaton ma contn e t o b sup lied

u tl stocks are e hausted

A British Stand ard do s n ot purport to include al the neces ary prov isions of a

contract U ser of British Stan dard s are responsible for their cor ect a pl cation

Compl anc with a British Standard do s not of itself c nfer im m unity

f om leg al obl g ations

Sum m ary of pag es

This document comprises a f ont cover, and inside f ont cov er, p g es i and i,

p ges 1 to 15 and a b ck cover

The BSI copy rig ht notice display ed in this document ind icates when the

document was last is ued

1 Scope

This British Stand rd specifies mater ials and manufactur e, dimensions,protectiv e treatment and qualty

as urance req uirements for aluminium-aloy hex ag on-hea bolts with unified threa s

NOT The latest edit ion of an Aer osp ce Ser ies stan ard is in icated b a prefix n mb r

2 Norm ative ref rences

The folowing normativ e documents contain provisions wh ich, throug h reference in this text, constitute

provisions of this British Stand rd For d ted references, subsequent amend ments to, or revisions of, any

of these publcations do not a ply For und ted references, the latest edition of the publcation refer ed to

a ples

BS3A10 , Spe ifica tion fr gener a l r equir ements f r bol s a nd fr ee-r un ing n ts o tensie str ength not

exce d ing 1 249MPa

BSL16 , Spe ifica tion f r ba r s a nd extr ud ed s ct ons o a luminium-cop er -ma gne ium-siicon-ma nga ne e

a ll oy (solut on tr ea ted a nd a r tificia lly a ged ) (not exce d ing 200mm dia meter o mino s ctona l d imension)

(Cu 4.4, Mg 0.5, Si 0.7, Mn 0.8)

3 General r quir ments

Bolts shal conform to BSA10

4 Materials and manufacture

The bolts shal be mach ined f om b r s that conform to BS L 16

5 Dim ensions and tolerances

5.1 All fin ished bolts shal confor m to the dimensions and tolerances specified in Ta le 1 and Ta le 2

5.2The clamping len gth of the bolt sh al conform to the dimensions an d tolerances specified in Ta le 2, and

shal be such that when a stand ard n t, without counter in or ring g aug e is, s rewed on as far as pos ible

b hand, its lea ing face is within a distance Mf om th e under ide of the bolt hea The ru -out of the

threa shal not ex ce d twice the threa pitch

5.3The nominal length of the bolt shal be the minimum bear ing length L, which is determined b the

minimum clamping leng th, M, les two thr ea pitches ( se Ta le 2)

NOT The b aring leng ths L quoted in Ta le 2 ar e in 0.1 inch inc ement s but where a 0.0 leng th incr ement is re uir ed t his should

b b ag re ment b t we n man facturer an user an should b identfied as folows: 8??B , in icatng a 6-3 UNC b lt of b aring

length L 0.8 inches.M an E ne d to b adjusted ac ordingly

6 Scr w threads

The bolts shal ha e u ified s rew thr ea s, of the for m and fit specified in the latest edition of BS A10

7 Anti- cor osion tr atment

All finished bolts shal be anodiz d and d y ed gre n

NOT Because of the use of the chromic acid proces for anodizing, the b lts wil not neces arily b u ifor mly coloured after st ai ning

NOT Hard es v alues ar e not curently a plica le,though the ma b come a plica le in the ne r future

9 Identification and marking

The bolts shal be marked in ac ord nce with BS3A10 :19 1, clause 8

10 Qual ty as urance procedure

The bolts shal conform to the qualty r equirements specified in BS A 10 , as a propriate to the method of

man facture

Fig ure 1 — Dimensions of bolts (se Ta le 1)

B

C

D

G

L

(bear in len t h)

M *

(clampin len t h)

E*

(o er al len t h)

F

(f or r ef

only)

15º

4 5º

3 º

R r ad

Max r uno t of

t hr ea = 2 x pit ch

A

D

3 º

R r ad

0.015 in

Dia of washer

f ace = B min - 0.01in

0

Nom inal siz De ima l

equiv lent

ofnominal

siz

Diam ete of

plain p rtion of

shan

2?

pitch??????

Min

length of

sc ewed

p rtion

of shan

Width ac os flat Width

ac os

corne s

T ick es ofhea Ra ius u de b lt

hea t

Depth of

cham fe

?

ma min Ref.only ma min ma ma min ma min ma min

0.1 2-4 UNC ( 4) 0.1 20 0.1 15 0.10 5 0.0 0 0.3 0 0.18 0.18 0.2 7 0.0 0 0.0 0 0.015 0.0 5 0.020 0.015

0.13 -32 UNC ( 6) 0.13 0 0.13 5 0.13 5 0.0 3 0.27 0.25 0.24 0.28 0.0 5 0.0 5 0.015 0.0 5 0.0 0 0.020

0.16 -32 UNC ( 8) 0.16 0 0.16 5 0.16 5 0.0 3 0.327 0.31 0.3 7 0.3 1 0.10 0.0 0 0.020 0.010 0.0 0 0.020

0.19 -32 UNF ( 10) 0.19 0 0.18 5 0.18 5 0.0 3 0.3 7 0.3 4 0.3 9 0.3 7 0.1 5 0.10 0.020 0.010 0.0 0 0.020

0.25 -28 UNF ( E) 0.25 0 0.24 5 0.24 5 0.0 1 0.4 9 0.4 8 0.4 1 0.5 5 0.15 0.14 0.0 0 0.015 0.0 0 0.0 0

0.31 5-24 UNF ( G) 0.31 5 0.31 0 0.3 9 0.0 3 0.4 7 0.5 0 0.4 3 0.5 7 0.18 0.17 0.0 0 0.015 0.0 0 0.0 0

0.3 5-24 UNF ( J) 0.3 5 0.3 4 0.3 15 0.0 3 0.5 7 0.5 2 0.5 4 0.6 0 0.2 0 0.2 0 0.0 0 0.015 0.0 0 0.0 0

0.4 7 -20 UNF ( L ) 0.4 7 0.4 7 0.4 3 0.10 0.6 0 0.6 8 0.6 9 0.7 4 0.27 0.26 0.0 0 0.015 0.0 0 0.0 0

0.5 0-20 UNF ( N ) 0.5 0 0.4 9 0.4 6 0.10 0.7 0 0.7 0 0.7 1 0.8 6 0.3 0 0.29 0.0 0 0.015 0.0 0 0.0 0

0.5 25-18 UNF ( P) 0.5 25 0.5 20 0.5 8 0.1 1 0.8 9 0.8 5 0.8 6 1.010 0.3 0 0.3 0 0.0 0 0.015 0.0 0 0.0 0

0.625-18 UNF ( Q) 0.625 0.624 0.620 0.1 1 0.9 9 0.9 8 0.929 1.0 3 0.3 0 0.3 0 0.0 0 0.015 0.0 0 0.0 0

* For b aring leng th L, clampling lengt h M an o eral leng th E se Ta le 2

???

This dimension is an a solute minimum as ociated wih ma imum length M an minimum length E I is not inten ed for use for man facturing or insp cton purp ses

a

Pa rt No L*

min

M E Pa rt No L*

min

min

min

17A 1.7 1.7 0 2.10 17B 1.7 1.7 3 2.10 17C 1.7 1.7 3 2.15 17D 1.7 1.7 3 2.20

18A 1.8 1.8 0 2.20 18B 1.8 1.8 3 2.20 18C 1.8 1.8 3 2.25 18D 1.8 1.8 3 2.3

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Pa rt No L*

min

M E Pa rt No L*

min

min

min

27A 2.7 2.7 0 3.10 27B 2.7 2.7 3 3.10 27C 2.7 2.7 3 3.15 27D 2.7 2.7 3 3.20

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Table 2 — Bearing leng th L, clamping leng th M and overal leng th E( contn ed)

Part No L*

min

m

min

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Ta le 2 — Bea ring length L, clam ping leng th M a nd overal leng th E( contn ed)

Part No L*

mi n

min

min

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Table 2 — Bearing leng th L, clam ping leng th M and overal leng th E( contnued)

Part No L*

min

m

m

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Ta le 2 — Bea ring length L, clam ping leng th M a nd overal leng th E( contn ed)

Part No L*

min

min

min

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Ta ble 2 — Bearing leng th L, clamping leng th M and overal leng th E( contnued)

Pa rt No L*

min

min

m

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Ta le 2 — Bea ring length L, clam ping leng th M a nd overal leng th E( contn ed)

Part No L*

m

m

min

*Se 5.3

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

+0

0.0 –

+0.0

0 –

Table 2 — Bearing leng th L, clamping leng th M and overal leng th E( contnued )

? in UNF

Pa rt No L*

min

*Se 5.3

+0

0.0 –

+0.0

0 –

Ta le 2 — Bea ring length L, clam ping leng th M a nd overal leng th E( contn ed)

? in UNF

Part No L*

m

*Se 5.3

+0

0.0 –

+0.0

0 –

Bibl og raphy

BS 3A 16 , Spe ifica tion fr a luminium a llo bol s (Unified hexa gons a nd u ified thr ea d s fr a ir cr a ft)

3 9 Chiswick Hig h Roa

L ondon

BSI is the independent national bod y responsible for prep ring

BritishStand rds It presents the UK view on stand rds in Europe and at th e

international level It is incor porated b Roy l Charter

Revisions

BritishStand rds are up ated b amendment or rev ision User of

BritishStand rds should make sure that they pos es the latest amendments or

editions

It is the constan t aim of BSI to improve the qual ty of our products and serv ices

W e would be g rateful if any one find ing an inac uracy or ambig uity whie using

this BritishStand rd would inform the Sec etary of the tech ical commit e

responsible, the identity of which can be fou d on the inside f ont cover

Tel:+4 ( 0)208 9 9 0 Fa :+4 (0)208 9 7 0

BSI ofer member an individual up ating serv ice caled PL US which ensures

that subs riber automatical y receiv e the latest editions of stan dar ds

Buying stand rds

Order for al BSI, in ternational and foreign stand rds publ cation s should be

a dres ed to Customer Ser vices Tel:+4 (0)208 9 9 01

Fa :+4 ( 0)208 9 7 01 Emai :ord er s@ bsi glob l.com Stand ard s are also

av aia le f om th e BSI website at ht p:/ /www.bsi g lob l.com

In response to order for international stand rds, it is BSI pol cy to sup ly the

BSI implementation of those th at have be n publshed as BritishStand rds,

u les otherwise requested

Information on standards

BSI provides a wide rang e of information on n ational, European an d

international stand rds through its Library and its Tech ical Help to Ex orter

Serv ice Various BSI electronic information services are also av aia le which give

detai s on al its products and serv ices Contact the Information Centr e

Tel:+4 ( 0)208 9 71 1 Fa :+4 (0)208 9 7 4 Emai: info@ bsi g lob l.com

S bs r ibing member of BSI are kept up to d te with stand rds d ev elopments

and receive substantial dis ou ts on the pur hase price of stand rds For detais

of these and other benefits contact Member hip Administration

Tel:+4 ( 0)208 9 7 02 Fa :+4 (0)208 9 7 01

Emai :member ship@ bsi glob l.com

Information regard in g onl ne ac es to British Stand rds v ia British Stand rds

Onlne can be fou d at ht p:/ /www.bsi glob l.com/bsonlne

Fur ther infor mation a out BSI is av ai a le on the BSI website at

ht p://www.bsi glob l.com

Cop rig ht

Copy right subsists in al BSI publcations BSI also holds the copy rig ht, in the

UK, ofthe publ cations of the inter national stand ar d ization bodies Except as

permit ed u der the Copy rig ht, Design s and Patents A ct 19 8 no extract ma be

repr oduced, stored in a retriev al system or transmit ed in any form or b any

means – electronic, photocop ing , recording or otherwise – without prior writ en

permis ion f om BSI

This do s not preclude the f e use, in the cour e of implementing the stand ard,

of neces ary detai s such as symbols, and siz , ty e or gra e designations I these

detai s are to be used for any other purpose than implementation then the prior

writ en permis ion of BSI must be obtained

Detai s and a v ice can be obtained f om the Copy rig ht & L icensing Man ager

Tel:+4 ( 0)208 9 7 7 Fa :+4 (0)208 9 7 5

Emai :cop r ig ht@ bsi glob l.com