Bsi bs a 300 1989 (2000) iso 7689 1988

BRITISH STANDARD AEROSPACE SERIES BS A 300 1989 ISO 7689 1988 Specification for Procurement of alloy steel bolts with strength classification 1100 MPa and MJ threads Reproduced by IHS under l icense w[.]

Specification for

This Bri shStan ard, ha ing

b en pre ared u der the

directonof the Aerosp ce

Stan ards Policy Commi e ,

waspublished u der the

authoriyof the Bo rd

ofBSIan comes

into efect on

3 Octo er1 8

© BSI0 -2 0

The folowing BSI references

relate to the work on this

stan ard:

Commi e referenceACE/12

Draft for comment8 /72 1 DC

ISBN 0 5 0 1 4 9 X

The prep ration of this BritishStand ard was entrusted b the Aerosp ce

Stand rds Pol cy Commit e ( ACE/ -) to Tech ical Commit e ACE/12 upon

which the fol owing bod ies were represented :

Civ il Av iation Authority ( Airworthines Div ision)

Electronic Eng ine ring Association

Ministry of Defence

Society of British Aerosp ce Comp nies Limited

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

Commit e s responsible Inside font cov er

Fig ure 4 — Non-permis ible la s, seams and

Fig ure 5 — Permis ible la s, seams and

Ta le 2 — Qual fication testing requirements for bolt samples 6

Ta le 3 — Summary of q ual fication an ac eptance tests 7

Ta le 5 — Minimum tensi e an double shear loa s

Ta le 6 — Qual fication and ac eptance v alues for

Ta le 7 — Thread dis ontin ities— Ma imum depth of

Ta le 9 — Samplng plans for v isual inspection and

Ta le 10 — Sampl ng plans for the inspection of

Ta le 1 — Varia le sampl ng for tensie an shear tests

Aerosp ce Stand ards Polcy Commit e , is id entical with ISO7 8 :19 8

“ A er ospa ce— A llo ste l bol s wih str ength cla ssifica tion1100MPa a nd MJ

thr ea d s— Pr ocur ement spe ifica tion” publshed b the International

Org anization for Stand rdization ( ISO)

The Tech ical Commit e has rev iewed the prov isions of ISO6 0 -1, and

ISO6 0 to which reference is mad e in the text, and has decid ed that they are

ac epta le for use in conju ction with this stand ard Related BritishStand ards

to ISO6 0 -1:19 1 and ISO6 0 -1:19 2are, respectiv ely , BS24 :19 6 “ Method

fr B r inel ha r d ne s te t a nd f r ver ifica tion o B r inel ha r d ne s te tng ma chine ”

and BS427 “ Method fr Vicker s ha r d ne s te t Part1:19 1 “ Te tng o meta ls” It

is env isag ed that a BritishStand rd cor espond ing to ISO7 61wi l be publshed

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

Inte national Stand rd Cor esp nding BritishStand rd

ISO28 9-1:19 4 BS6 01 Sa mplng pr oc d ur es fr inspe ton by a ttr ibute

Part1:19 2 Spe ifica tion f r sa mplng pla ns ind exed by

a cc pta ble qua liy level(A QL) fr lot-by-lot inspe t on

( Tech icaly eq uiv alent)

ISO3 3 :19 7 BS5 32 Sta tistca l ter minology

Part1:19 8 Glos a r y o ter ms r ela ting to pr oba bii y a nd

gener a l ter ms r ela ting to sta tistc

( Identical

ISO5 5 -2:19 1 BS629 MJ thr ea d s fr a er ospa ce constr ucton

Part2:19 2 Spe ifica tion f r d imensions fr bols a nd

n ts

( Identical

ISO6 0 :19 6 BS8 1 Method fr R ockwel ha r d ne s te t

Part1:19 2 Te t ng o meta ls

( Tech icaly eq uiv alent)

Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g esi andi ,

p g es1 to14, an inside 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 indicated in the amendment ta le on the

inside f ont cov er

1 Scope and field ofappl cation

This InternationalStand rd specifies the characteristic an q ualty as urance req uirements for bolts

with normal hea s, ma e of aloy ste l, hav ing a tensie streng th clas ification of1 10 MPa andMJ

thread s, and intended for use in aerosp ce construction

This InternationalStand rd a ples to bolts as defined a ov e, prov ided that reference is mad e to this

InternationalStand ard in the product stand ard or definition document

2 Ref r nces

ISO28 9-1, Sa mplng pr oc d ur es fr inspe ton by a ttr ibute — Pa r t1: Sa mplng pla ns ind exed by

a cc pta ble qua liy level (A QL) fr lot-by-lot inspe t on

1)

ISO3 3 , Sta tistc — Voca bula r y a nd symbols

ISO5 5 -2, A er ospa ce constr ucton— MJ thr ea d s— Pa r t2: D imensions f r bol s a nd n ts

ISO6 0 , Meta llc ma ter ia ls— Ha r d ne s te t— B r inel te t

ISO6 0 -1, Meta llc ma ter ia ls— Ha r d ne s te t— Vicker s te t— Pa r t1: HV5 to HV100

ISO6 0 , Meta llc ma ter ia ls— Ha r d ne s te t— R ockwel te t

(s a le A– B– C– D– E– F– G– H– K)

ISO7 61, Aer ospa ce— B ols— Te t method s

2)

3 Definitions

3.1

pro uction batch

q uantity of finished bolts man factured, using the same proces , f om a sing le material cast ( sing le heat

of aloy ), hav ing the same b sic p rt n mber an diameter, heat-treated tog ether to the same specified

cond ition and produced as one contin ous ru

3.2

inspe tion lot

q uantity of bolts fom a sing le production b tch with the same p rt n mber which completely defines the

bolts

3.3 Discontinuities

3.3.1

crack

rupture in the material which ma extend in any d irection an which ma be inter ry stal ine or

trans ry stal ine in character

3.3.2

seam

open sur ace defect resulting f om extension of the material

3.3.3

la

sur ace d efect caused b fold ing ov er metal fins or sharp corner and then rol ng or forg ing them into the

sur ace

3.3.4

inclusions

non-metal c p rticles orig inating f om the material manufacturing proces These p rticles ma be

isolated or ar ang ed in string s

1)

At present at the stag e of draft.( Re ision,in p rt,of ISO2 5 :1 7 )

2)

At present at the stag e of draft

3.4

sing le random sampl ng

the taking of n items f om a population of N items in such a wa that al pos ible combinations of n items

hav e the same prob bi ity of being chosen

3)

3.5

critical defe t

a d efect that, ac ording to jud g ement and ex erience, is l kely to result in hazardous or u safe conditions

for indiv id uals using , maintaining or d epend ing upon the considered prod uct, or that is l kely to prev ent

perormance of the fu ction of a major end item

3)

3.6

m ajor defe t

a defect, other than c itical, that is lkely to result in a faiure or to reduce material y the usa i ity of the

considered product for its intended purpose

3)

3.7

minor defe t

a defect that is not lkely to red uce material y the usa i ity of the consid ered product for its intend ed

purpose, or that is a dep rture fom esta l shed specification hav ing l t le bearing on the efectiv e use or

operation of this product

3)

3.8

samplng plan

a plan ac ording to which one or more samples are taken in ord er to obtain information and pos ibly to

reach a decision

3)

3.9

l m iting qual ty (LQ)

in a sampl ng plan, a q ual ty lev el which cor esponds to a specified an relativ ely low prob bi ty of

ac eptance: for the purposes of this InternationalStand rd, a10% prob bi ty of ac eptance ( LQ

1 ) It is

the l miting lot q ualty characteristic that the consumer is wi ing to ac ept with a low prob bi ty that a

lot of this qualty would oc ur

)

3.10

ac epta le qual ty level (AQL)

a q ualty lev el which in a sampl ng plan cor espond s to a specified but relativ ely hig h prob bi ty of

ac eptance

it is the ma imum per cent defectiv e ( or the ma imum n mber of defects per h ndred u its) that, for

purposes of sampl ng inspection, can be considered satis actory as a proces av erag e

3)

4 Qual ty as ura nce

4.1 General

4.1.1 Appr val o manufacturers

The man facturer shal conform to the q ual ty as urance and a prov al proced ures in efect in the

pur haser’s cou try :the purpose of these procedures is to ensure that a man facturer has a q ual ty sy stem

an the ca a i ty for contin ous production of bolts comply ing with the specified q ual ty req uirements

The g ranting of an a prov al of the man facturer is a fu ction of the Certification Authorities, or their

a pointed representativ e, who ma be the prime contractor

4.1.2 Q ual ficat ion o b lt s

The purpose of qualfication inspections and tests of bolts is to check that the desig n and manufacturing

cond itions of a bolt al ow it to satis y the req uirements of this InternationalStand rd

The g ranting of q ualfication of a bolt is a fu ction of the Certification Authorities in the pur haser’s

cou try , or their a pointed representativ e, who ma be the prime contractor

3)

Defini on taken fom ISO3 3 :1 7 ( ISO3 3 is cur ently b ing rev ised b ISO/ TC6 , Ap lca tions of statstcal method s.)

4.1.3 Ac ept anc o b lts

The purpose of ac eptance inspections an tests of bolts is to check, as simply as pos ible, using a method

which is inex ensiv e and representativ e of actual conditions of use, with the uncertainty in erent in

statistical sampl ng , that the bolts satis y the req uirements of this InternationalStand rd

Acceptance inspections an tests shal be car ied out b the man facturer, or und er his responsibi ty The

man facturer is responsible for the qual ty of the bolts manufactured

4.2 Qualfication inspe tion and test conditions

Qual fication inspections and tests ( req uirements,method s, number of bolts) are specified in Ta le 1 They

shal be car ied out on

— each ty pe and d iameter of bolt,

— 25 bolts selected f om a sing le inspection lot b simple rand om samplng

The test prog ramme ma pos ibly be red uced, or the qualfication of a bolt be g ranted , without inspection

or testing : any such decision shal be b sed on the results obtained on simi ar ty pes and d iameter of bolts

prov ided that the desig n and manufacturing conditions are id entical

The inspections and tests shal be repeated on any bolt if the man facturing conditions hav e chang ed

Ta le 2 ind icates the al ocation of bolt specimens for the inspections and tests

Qual fication inspections and tests are summariz d in Ta le 3

4.3 Acc ptanc inspe tion and test conditions

Acceptance inspections and tests ( req uirements, methods, number of bolts) are specified in Ta le 1; they

shal be car ied out on each production b tch or inspection lot Bolts f om the b tch or lot to be tested shal

be selected b simple random samplng

Each bolt ma be submit ed to sev eral inspections or tests

The bolts to be subjected to destructiv e inspections or tests ma be those on which non-destructiv e

inspections or tests hav e be n car ied out

I a more string ent inspection is d eemed neces ary , al or p rt of the q ualfication inspections and tests ma

be per ormed during the ac eptance inspection an testing In this case, the number of bolts submit ed to

these inspections and tests is the same as that submit ed for q ualfication inspections and tests

Production b tches or inspection lots d eclared u ac epta le after the ac eptance inspections and tests shal

be submit ed for re-nspection or re-testing only after al defectiv e u its hav e be n remov ed and / or defects

hav e be n cor ected

Twice the normal sample siz shal be used for re- nspecting or re-testing the at ributes causing initial

rejection; the same ac eptance lev el shal be used

Acceptance inspections and tests are summariz d in Ta le 3

The requirements of this InternationalStand rd are g iv en in Ta le 1 and , u les otherwise specified, they

a ply to bolts rea y for use Unles otherwise specified, the test temperature shal be the ambient

temperature These req uirements complement the requirements of al other stand ard s or specifications

referenced in the prod uct stand rd or in the d efinition document of the bolt

Ta le 1 — Te hnical requirem ents and test m ethods

Clause

No

C aracte is ic Te h ical r quir m ent Inspe tion and tes m etho Q/A

a

S m ple

siz

5.1 Mate ials In acordance wih the prod ct stan ard or

defini on document

As stated in the material

sp cificaton

5.2 Dim ensions In acordance wih the re uirements of the

prod ct stan ard or defini on prod ct

Stan ard g aug ing Q

A 2

Ta le 8 an

Ta le 9

5.3 Man facturing

5.3.1 Fo ging The he ds of the b lts shal b formed b a hot

or cold forg ing proces b fore he t tre tment

In the case of hot forg ing , the e uipment shal

b such that an ade uate temp rature is

g uarante d throug hout the prod cton b tch

The e uipment used shal b

a prov ed

5.3.2 Heat tr atment The forg ed blan s shal b he t tre ted to

prod ce the pro ertes re uired b the prod ct

stan ard or defini on document.Blan s shal

not b hardened more than twice

5.3.3 Machining The amou t of material remo ed fom the

b aring surace of the he d an the shan of

the he t-tre ted blan s shal b as li le as

practca le consistent wih the remo al of

surace contaminaton,prod cton of a smo th

surace an maintenance of o tmum g rain

flow arou d the u der-he d filet radius as

shown in Fig ure 1

Se 5.5.1

5.3.4 Cold r l ing The filet radius shal b cold roled, after he t

tre tment an machining so as to remo e al

visual sig ns of machining an to ce te

sup ricial cold working ; this ma cause

distorton which shal not e ce d the v alues

shown in Fig ure 2;this re uirement is not

a plica le to fuly thre ded s rews or b lts wih

a nominal diameter les thanMJ

Se 5.5.1

5.3.5 Thr ads To b formed b a sing le roling roces after al

he t tre tment ( e.g after hardening ,

temp ring ,etc.)

5.3.6 Surac r ugh es In acordance wih the prod ct stan ard or

defini on document

V isual comp rison method or

th mbnail comp rison method

Q

A 3

Ta le 8 an

Ta le 9

5.3.7 Surac c ating In acordance wih the prod ct stan ard or

defini on document

Se a plica le co tng

sp cificaton

Q

A 3

Ta le 8 an

Ta le 9

5.4 Me hanical

pro e ties

5.4.1 Tensie s r ngth In acordance wih the minimum tensile lo ds

sp cified in Ta le 5

Tensile tests are not a plica le to the folowing :

a) protru ing he d b lts of g rip leng th les

than2D ;

b) cou teru k he d b lts of g rip leng th les

than2,5D ;

c) thre ded-to-he d b lts of o eral leng th

les than3D or b lts ha ing n o eral

leng th les than1 mm

In such cases, this test shal b re laced b a

hard es test

A 5

Ta le 1 ,

columnB

or Ta le 1

a

Q =qualificaton insp cton an test con i ons ( se 4.2)

A =ac e tance insp cton an test con i ons ( se 4.3)

Table 1 — Te hnical requirem ents and test m etho s

Clause

No

Characte is ic Te h ical r quir m ent Inspe tion and tes m etho Q/A

S m ple

siz

5.4.2 Double shear

sr ngth

In ac ordance wih the v lues sp cified in

Ta le 5

The g rip leng th shal not b shorter than twice

the nominal shan diameter for protru ing

he d b lts or shorter than2,5tmes the

nominal shan diameter for cou ter u k he ds

A 5

Ta le 1 ,

columnB or

Ta le 1

5.4.3 Hard es Before surace co tng is a plied, the hard es

at the en of the thre d shal b :

Brinel:3 7/ 37 HBS

or Rockwel:3 / 40HR

or V icker:3 4/ 39 HV3

Se ISO6 0 , ISO6 0 -1 an

ISO6 0

Q

A 4

Ta le 1 ,

columnA

5.4.4 Tension fatigue

sr ngth

Life:

— me n v lue

— in ivid al v alue

Fre uency :

Lo ds:

6 0 0cy clesmin

4 0 0cy clesmin

1 00 0cyclesma

1 0Hz

se Ta le 6

A 1

Ta le 1 ,

columnB

Unbroken b lts shal b ren ered u usa le

Unles otherwise sp cified, fatg ue tests shal

not b car ied out on the folowing :

a) b lts wih driled shan s;

b) b lts of thre d size smaler than5mm;

c) b lts ha ing a g rip leng th of les than

twice the diameter

5.5 Metalurg ical

pro e ties

5.5.1 Head- to- shank

grain flow an

fi et wo k efct

Flow lines in the filet are immediately b low

the surace shal closely conform to the filet

contour ( se Fig ure 1)

Se Fig ure 1 for bre ks in flow lines

If there is doubt a out the ac e ta iliy of the

g rain flow or filet work efect, the ac e ta iliy

shal b decided b the results of the ac e tance

fatg ue test

Sp cimens shal b taken fom

the finished b lt ( se Fig ure 6)

The sectons to b e amined

shal b subjected to a

mac os o ic etchant

Mac oso ic e aminaton of a

long itu inal secton at a

suia le mag nificaton

( X 10 toX 20)

Q

A 4

Ta le 1 ,

columnB

5.5.2 Thr ad grain flow

an wo k efct

The g rain flow shal b contn ous an shal

folow the g eneral thre d contour wih the

ma imum densiy at the b t om ofthe ro t

radius ( se Fig ure 3)

Mac os o ic e aminaton Q

A 4

Ta le 1 ,

columnB

5.5.3 Mic os ructur The finished b lts shal show no sig ns of

o erhe tng , carburizaton,nirog enizaton or

interg ran lar o idaton in e ces of the limis

sp cified in Ta le 4

Sp cimens shal b taken fom

the finished b lt ( se Fig ure 6)

The sectons to b e amined

shal b subjected to an

a pro riate micos o ic

etchant

Mic os o ic e aminaton at a

mag nificaton ofX 10

In cases of doubt,

mic o-hard es testng of the

shan shal b car ied out using

a lo d of5 g Bolts are

ace ta le if the d iference in

V icker mic o-hard es , when

me sured in a zone

b twe n0,0 5 an 1,5mm fom

the surace,is wihin4 p ints

Q

A 4

Ta le 1 ,

columnB

5.5.4 Disc ntin ities The b lts shal not show any dis ontn iy

e ual to or g re ter than the limiatons

sp cified in this InternatonalStan ard

( se Ta le 4) Care shal b e er ised to a oid

confusing c acks wih other dis ontn i es

Cracked b lts an those ha ing dis ontn i es

transv r e to the a is ( i.e.at an ang le of more

than1 ° to the long itu inal a is) shal b

rejected an destro ed

Mag netc insp cton b b th

long itu inal an cir ular

methods The combined method

is p rmis ible

In cases of doubt, mic oso ic

e aminaton at a mag nificaton

of X 10 shal b car ied out

Q

A 2

Mag netc:

Ta le 8 an

Ta le 9

Mic oso ic

e aminaton:

Ta le 1 ,

columnB

Ta le 1 — Te hnical requirem ents and test m ethods

Ta le 2 — Qual fication testing requirements for b lt sam ples

Clause

No

C aracte is ic Te h ical r quir m ent Inspe tion and tes m etho Q/A

S m ple

siz

5.5.4.1 Head an shank Se Ta le 4 for the limis of ac e tance

5.5.4.2 Thr ad Acce tance limis ( se Fig ure 4 an Fig ure 5):

— in the u lo ded p rt of the filet, a o e the

pich diameter, se Ta le 7;

— at the cest of the thre ds, se Ta le 7—

v lues to b inc e sed b half the diference

b twe n the actual me sured diameter an

the minimum e ternal thre d diameter

(se ISO5 5 -2);

— a slig ht ir eg ulariy in the form of the

c ests in relaton to the b sic profile is

ac e ta le (se Fig ure 5)

5.6 Pro uct

identification

Marking in acordance wih the prod ct

stan ard or defini on document

Bolts to b “p ckag e-marked” shal b p cked

an identfied in ac ordance wih5.7.1

an 5.7.2

A 2

Ta le 8 an

Ta le 9

5.7 Delve y

5.7.1 Pack ging The b lts shal b p cked in such a wa as to

pre ent any damag e or corosion oc ur ing in

the cour e of han ling , transp rtaton an

storag e

Each b sic p ckag e shal only contain b lts wih

the same p rt n mb r an the same insp cton

lot n mb r

5.7.2 La el ng Each b sic p ckag e shal car y a la el on which

the complete p rt n mb r,quant y, prod cton

b tch n mb r an insp ctor’s stamp ha e b en

leg ibly recorded

Ty e oftes

Deined

in

Bolt sam ple n m be

Non-des ructive

S race roug hnes 5.3.6 X X X

Des ructive

He d-to-shan g rain flow

an filet work efect

Thre d g rain flow an

work efect