Bsi bs a 299 1989 (2000) iso 5857 1988

BRITISH STANDARD AEROSPACE SERIES BS A 299 1989 ISO 5857 1988 Specification for Procurement of alloy steel protruding head bolts with strength classification 1 250 MPa and MJ threads Reproduced by IHS[.]

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 of BSI

an 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 reference ACE/ 12

Draft for comment7 / 80 2 DC

ISBN 0 5 0 1 4 0 3

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

Stand ard s 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 sur ace ir eg ularities 16

Fig ure 5 — Permis ible la s, seams an surace ir eg ularities 16

Ta le 2 — Qual fication testing requirements for bolt samples 8

Ta le 3 — Summary of q ual fication an ac eptance tests 9

Ta le 5 — Minimum tensi e, double shear an stres dura i ty loa s

Ta le 6 — Qual fication and ac eptance v alues for tension fatig ue test 10

Ta le 7 — Thread dis ontin ities — Ma imum depth of permis ible faults 10

Ta le 9 — Samplng plans for v isual inspection and inspection of

Ta le 10 — Sampl ng plans for the inspection of mechanical an

Ta le 1 — V aria le sampl ng for tensie test ( alternativ e method) 13

theAerosp ce Stand rd s Polcy Commit e , is identical with

ISO5 5 :19 8“ A er ospa ce — A llo ste l pr otr ud ing hea d bols wih str ength

cla ssifica tion12 0MPa a nd MJ thr ea d s— Pr ocur ement spe ifica tion”

publshedb the International Org anization for Stand ard ization ( ISO)

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

reference is ma e in the text, and has d ecided that they are ac epta le for use in

conjunction with this stand ard A related BritishStand ard to ISO6 0 -1:19 2 is

BS427 “ Method f r Vicker s ha r d ne s te t Part1:19 1 “Te t ng o meta ls” It is

env isag ed that a BritishStand rd cor esponding to ISO7 61 wi 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 fr sa mplng pla ns ind exed by

a cc pta ble qua liy level (A QL) f r lot-by-lot inspe ton

( Tech icaly equiv 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 biiy

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 f r a er ospa ce constr ucton

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

a ndn ts

( Identical

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

Part1:19 2 Te tng o meta ls

( Tech icaly equiv 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 to18, 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 International Stand rd specifies the

characteristic and q ual ty as urance requirements

for bolts with protruding hea s, ma e of al oy ste l,

hav ing a tensie streng th clas ification

of125 MPa an MJ thread s, and intend ed for use

in aerosp ce construction

This International Stand rd a ples to bolts as

defined a ov e, prov ided that reference is ma e to

this International Stand rd in the product stand rd

or definition d ocument

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 ton

1)

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

ISO5 5 -2, A er ospa ce constr ucton— MJ

pro uction batch

q uantity of finished bolts manufactured, using

thesame proces , f om a sing le material cast

( sing leheat of al oy ), hav ing the same b sic p rt

n mber and d iameter, heat-treated tog ether to

thesame specified condition an prod uced as one

contin ous ru

3.2

inspe tion lot

q uantity of bolts fom a sing le production b tch

withthe same p rt n mber which completely

defines thebolt

3.3 Discontinuities

3.3.1

crack

rupture in the material which ma exten in any

d irection and which ma be inter ry stal ine or

trans ry stal ine in character

sur ace d efect caused b fold ing ov er metal fins or

sharp corner and then rol ing or forg ing them into

the sur ace

3.3.4

inclusions

non-metal c p rticles orig inating f om the material

man facturing proces These p rticles ma be

isolated or ar ang ed in string s

3.4

simple random sam pl 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 ty of being chosen

3)

3.5

critical defe t

a d efect that, ac ord ing to judg ement and

ex erience, is l kely to result in hazardous or u safe

conditions for indiv iduals using , maintaining or

depend ing upon the considered prod uct, or that is

l kely to prev ent per ormance of the fu ction of a

major end item

3)

3.6

m ajor defe t

a d efect, other than c itical, that is l kely to result in

a faiure or to reduce material y the usa i ty of the

considered prod uct for its intended purpose

3)

3.7

m inor defe t

a d efect that is not lkely to red uce materialy the

usa i ty of the consid ered product for its intended

purpose, or that is a dep rture fom esta lshed

specification hav ing l t le bearing on the efectiv e

use or operation of this product

3)

3.8

sam pl ng plan

a plan ac ording to which one or more samples are

taken in order to obtain information and pos ibly to

reach a d ecision

3)

3.9

l m iting qual ty (LQ)

in a sampl ng plan, a q ualty lev el which

cor esponds to a specified and relativ ely low

prob bi ity of ac eptance: for the purposes of this

International Stand rd , a10%prob bi ty of

ac eptance ( LQ

1) It is the lmiting lot qualty

characteristic that the consumer is wi lng to ac ept

with a low prob bi ty that a lot of this q ualty would

oc ur

)

3.10

ac epta le qual ty level (AQL)

a qual ty lev el which in a samplng plan cor esponds

to a specified but relativ ely hig h prob bi ity of

ac eptance

it is the ma imum per cent d efectiv e ( or the

ma imum n mber of d efects per h ndred u its)

that, for purposes of sampl ng inspection, can be

consid ered satis actory as a proces av erag e

4)

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 procedures in efect in the

pur haser’s country : the purpose of these

proced ures is to ensure that a man facturer has a

q ual ty sy stem and the ca a i ty for contin ous

production ofbolts comply ing with the specified

q ual ty requirements

The g ranting of an a prov al of the manufacturer 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 q ual fication inspections and tests of

bolts is to check that the d esig n and man facturing

conditions of a bolt al ow it to satis y the

requirements of this International Stand rd

The g ranting of qualfication 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

4.1.3 Ac eptanc o b lt s

The purpose of ac eptance inspections and tests

ofbolts is to check, as simply as pos ible, using a

method which is inex ensiv e an representativ e

ofactual conditions of use, with the u certainty

in erent in statistical samplng , that the bolts

satis y the req uirements of this International

Stand ard

Acceptance inspections and tests shal be car ied

out b the man facturer, or u der his

responsibi ty The man facturer is responsible for

the qual ty of the bolts man factured

4.2 Qual fication inspe tion and test

conditions

Qualfication 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 an diameter of bolt,

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

simple random sampl ng

The test prog ramme ma pos ibly be reduced, or the

q ual fication of a bolt be g ranted , without inspection

or testing : any such d ecision shal be b sed on the

results obtained on simiar ty pes and diameter of

bolts prov ided that the desig n and man facturing

conditions are id entical

The inspections and tests shal be repeated on any

bolt if the manufacturing conditions hav e chang ed

Ta le 2 ind icates the alocation of bolt specimens for

the inspections and tests

Qualfication 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,

method s,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 rand om samplng

Each bolt ma be submit ed to sev eral inspections

ortests

The bolts to be subjected to destructiv e inspections

or tests ma be those on which non-d estructiv 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 ual fication inspections and tests

ma be perormed d uring the ac eptance inspection

and testing In this case, the n mber of bolts

submit ed to these inspections an tests is the

sameas that submit ed for q ualfication inspections

and tests

Prod uction b tches or inspection lots declared

u ac epta le after the ac eptance inspections

andtests shal be submit ed for re- nspection or

re-testing only after al d efectiv e u its hav e be n

remov ed and / or defects hav e be n cor ected

4)

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

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

beused

Acceptance inspections and tests are summariz d

inTa le 3

The req uirements of this International Stand 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 requirements complement the

req uirements of al other stand rds or specifications

referenced in the product stand rd or in the

d efinition document of the bolt

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

Clause

No

Characte is ic Te h ical r quir m ent

Inspe tion and tes

m etho

Q/Aa

S m ple siz

5.1 Materials In ac ord ance with the prod uct

stand rd or definition d ocument

As stated in the

material specification

5.2 Dim ensions In ac ord ance with the

req uirements of the product

stand rd or definition d ocument

Stand rd g aug ing Q

A2

Ta le 8

andTa le 9

5.3.1 Fo ging The head s of the bolts shal be

formed b a hot or cold forg ing

proces before heat treatment

In the case of hot forg ing , the

eq uipment shal be such that an

ad eq uate temperature is

g uarante d throug hout the

production b tch

The eq uipment used

shal be a prov ed

5.3.2 Heat t reatment The forg ed blanks shal be heat

treated to prod uce the properties

req uired b the prod uct stand rd or

definition document Blan s shal

not be hardened more than twice

5.3.3 Machining The amou t of material removed

fom the bearing surace of the hea

and the shan of the heat-treated

blan s shal be as lt le as

practica le consistent with the

remov al of sur ace contamination,

production of a smo th sur ace an

maintenance of optimum g rain flow

arou d the u der-head fi et ra ius

as shown in Fig ure 1

Se 5.5.1

5.3.4 Stre s-rel eving After g rinding and before threa

an fi let rol ng , bolts shal be

stres -relev ed at a temperature

hig her than19 °C and20 to3 °C

below the final tempering

temperature for at least2h

5.3.5 Cold r l ing The fi et ra ius shal be cold roled

after heat treatment an machining

so as to remove al v isual sig ns of

machining and to c eate supericial

cold working ; this ma cause

distortion which shal not exce d

the v alues shown in Fig ure 2; this

requirement is not a pl ca le to

fuly threa ed s rews or bolts with

a nominal d iameter les than MJ

Se 5.5.1

5.3.6 Threads To be formed b a sing le rol ng

proces after al heat treatment

( e.g after hardening , tempering ,

stres -relev ing , etc.)

a

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

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

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

Clause

No

C aracte is ic Te h ical r quir m ent

Inspe tion and tes

In the ev ent of the bolt g rip leng th being

shorter than twice the nominal shan

d iameter, this test shal be replaced b a

hard nes test

A5

In the ev ent of the bolt g rip leng th being

shorter than twice the nominal shan

d iameter, this test shal be replaced b a

hard nes test

5.4.3 Hardne s Before sur ace coating is a pl ed, the

hardnes at the end of the threa shal be

Ta le 10,

column B

Unbroken bolts shal be rendered

u usa le

These req uirements are only a pl ca le to

bolts with diameter g reater than MJ5

an with a g rip leng th g reater than twice

Bolts that hav e be n subjected to this test

shal be destroy ed

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

Flow lnes in the fi let area

immed iately below the

surace shal closely conform

to the fi et contour

( se Fig ure 1)

Se Fig ure 1 for breaks in the

flow lne

I there is d oubt a out the

ac epta i ty of the g rain flow

or fi et work efect, the

ac epta i ty shal be decid ed

b the results of the

ac eptance fatigue test

Specimens shal be taken

f om the finished bolt

( se Fig ure 6) The sections

to be ex mined shal be

subjected to an a propriate

mac os opic etchant

Mac os opic ex mination

of a long itudinal section at

a suita le mag nification

( X 10 to X 20)

Q

A4

The grain flow shal be

contin ous an shal fol ow

the g eneral threa contour

with the ma imum density at

the bot om of the ro t ra ius

( se Fig ure 3)

Mac os opic ex mination Q

A4

carburization, nitrog enization

or interg ran lar oxid tion in

exces of the lmits specified

in Ta le 4

Specimens shal be taken

f om the finished bolt

( se Fig ure 6) The sections

to be ex mined shal be

subjected to an a propriate

mic os opic etchant

Mic os opic ex mination at

a mag nification of X 10

In cases of doubt,

mic o-hardnes testing of

the shank shal be car ied

out using a loa of5 g

Bolts are ac epta le if the

diference in Vicker

mic o-hardnes , when

Ta le 10,

column B

5.5.4 Dis ont inuitie The bolts shal not show any

dis ontin ity equal to or

g reater than the lmitations

specified in this International

Stand rd ( se Ta le 4) Care

shal be exer ised to av oid

confusing c acks with other

dis ontin ities

Cracked bolts an those

hav ing dis ontin ities

transv er e to the a is ( i.e.at

an ang le of more than10° to

the long itud inal a is) shal be

rejected an destroy ed

Mag netic inspection b

both long itudinal and

cir ular methods The

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

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 Hea d a nd sha nk Se Ta le 4 for lmits of

v alues to be inc eased b

half the diference betwe n

the actual measured

diameter and the minimum

external thread diameter

( se ISO5 5 -2);

— a slg ht ir eg ularity in

the form of the c ests in

relation to the b sic profi e

is ac epta le ( se Fig ure 5)

5.5.5 G rinding

burns

Before coating , the bolts shal

show no sig ns of g rinding

burns

A3

Ta le 10,

column A

identification

Marking in ac ord nce with

the product stand ard or

definition document

Bolts to be “ packag e-marked”

shal be p cked and identified

in ac ord ance with5.7.1

and5.7.2

A25

Ta le 8 and

Ta le 9

5.7.1 Packaging The bolts shal be p cked in

such a wa as to prev ent any

d mag e or cor osion

oc ur ing in the cour e of

handlng , transportation an

storag e

Each b sic p ckag e shal only

contain bolts with the same

p rt n mber an the same

inspection lot number

5.7.2 Label ing Each b sic p ckag e shal

car y a la el on which the

complete p rt n mber,

quantity , production b tch

number and inspector’s

stamp hav e be n leg ibly

recorded

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

Hea -to-shan

g rain flow and

fi let work efect