Bsi bs 2a 302 2000 (2001) iso 5858 1999

BRITISH STANDARD AEROSPACE SERIES BS 2 A 302 2000 ISO 5858 1999 Incorporating Corrigendum No 1 Nuts, self locking, with maximum operating temperatures less than or equal to 425 ?? ?? ? ?? ?C — Procure[.]

Incor por a ting

Cor r igend um No 1

This British Stan ard, ha ing

b en pre ared u der the

direction of the Eng ine r ing

Sector Commite , was

publshed u der the authority

of the Stan ards Committ ee

an comes into efect on

1 J n ary2 0

© BSI 0 -2 0

ISBN 05 0 3 4 1 8

Th is British Stand r d reproduces v erb tim ISO 5 5 :19 9, in clud ing

corr ig endum N ovembe 20 0,and implements it as the UK national stand rd

It super ed es BS A 3 2:19 2 which is withd rawn

The UK p rticip tion in its prep ration was entrusted b Tech ical Commit e

ACE/1 , Aerosp ce fastener and fastening sy stems, to S bcommit e

ACE/ 12/1, Aerosp ce fastener and fasten ing systems ( International , which

has the responsibi ty to:

A l st of org nizations represented on this commit e can be obtained on

request to its sec etary

Th e British Stand ards which implement international publcations refer red to

in this d ocumen t ma be found in the BSI Stand ards Catalogue un der the

section entitled “ International Stand rds Cor espondence Index ”, or b using

the “F ind” faci ity of the BSI Stand r ds Electr onic Catalog ue

A British Stand rd do s not purport to include al the neces ary prov isions of

a contract User of British Stand rds are responsible for their cor ect

a plcation

Com pl a nc with a British Standard do s not ofitself c nfer immunity

f om leg al obl g ations

— aid enq uir er to u der tan d the tex t;

— present to the responsible international/ European commit e any

enq uiries on the interpretation , or proposals for chang e, and ke p the

UK interests informed ;

— monitor r elated inter national and European dev elopments and

promulg ate them in the UK

Sum mary ofpag es

This document comprises a font cov er, an inside f on t cov er, the ISO title p g e,

p g es i and i i, a blan p ge, p ges 1 to 26, an inside b ck cove and a b ck

cov er

The BSI copy right notice display ed in this d ocument indicates when the

document was last is ued

Am endm ents is ued sinc publ cation

13 52

Corr ig n umNo.1

Ju e 20 1 Indicated b a sidel ne

Seco d e itio

19 9-1 -15

Cor r ecte a d r ep nte

2 0 -1 -15

A éronautiq e et esp ce — Écr ou à freinage interne dont la temp rature

maximale d'uti sation est infér ieure ou égale à 4 5 °C — Sp cification

d'a provision ement

Contents Pa e

1 Sc pe 1

2 Normativ refere c s .1

3 Terms a d d finitio s 2

4 Qu lty a s ra c 4

4.1 Ge eral 4

4.1.1 Ma ufa turer's ap ro al 4

4.1.2 Qu lfic tio of n ts 4

4.1.3 Pro u tio a c pta c of n ts 4

4.2 Qu lfic tio inspe tio a d te t c n ition 5

4.3 Pro u tio a c pta c in pe tio a d te t c n itio s 5

4.4 Us of "statistic l pro e s c ntrol (SPC)" 5

5 Te h ic l re uireme ts .6

Ann x A (nor mative) Type of permis ible s rfa e dis o tin ity (se 5.1.4) 2

Ann x B (infor mativ e) Cros -s ctio al are formula (se Ta les 3 an 4) 2

ISO (he International Organization for Stan ardization) is a w orldwide federation of national stan ard b dies (ISO

memb r b dies) The w ork of pre arin International Stan ard is normaly carr ied out throu h ISO tec nical

commite s Eac memb r b d inter ested in a s bject for whic a tec nical commite has b en esta ls ed has

the r i ht to b r epresented on that commite International organization , governmental an non-gover nmental, in

laison w ith ISO, also tak e p rt in the w ork ISO cola orates closely w ith the International Electrotec nical

Commis ion (IEC) on al mater s of electr otec nical stan ar dization

Inter national Stan ar ds ar e dr afed in ac or dan e w ith the r ules given in the ISO/IEC Dir ectives, Par t 3

Draf International Stan ar ds ado ted by the tec nical commite s are circ lated to the memb r b dies for votin

Publcation as an Inter national Stan ar d r eq ir es a pr oval by at le st 7 % of the memb r b dies castin a vote

Inter national Stan ard ISO 5 5 w as pr ep red by Tec nical Commite ISO/TC 2 , A ircraf an sp ce vehicles,

Subcommite SC 4, A erosp ce fastener s stems

This secon edition can els an r eplaces the fir st edition (ISO 5 5 :19 1), whic has b en tec nicaly r evised

An ex A for ms a nor mative p r t of this Inter national Stan ar d An ex B is for infor mation only

Aerospace — Nuts, self lock ing, with maximum operating

This International Stan ard sp cifies the req ired c ar acter i tic for metric selflock in n ts, with MJ thre d , for

u e in a r osp ce con tr uction at a maximum temp r atur e les than or eq al to 4 5 °C

It is a plca le to n ts as defined a ove, pr ovided that r eferen e is made to this International Stan ard in the

r elevant definition doc ment

The folowin normative doc ments contain provision whic , throu h referen e in this text, con titute pr ovision of

this International Stan ard For dated r eferen es, s bseq ent amen ments to, or revision of, an of these

publcation do not a ply How ever, p rties to agre ments b sed on this Inter national Stan ar d ar e en our aged to

in estigate the p s ibi ty of a plyin the most recent edition of the normative doc ments in icated b low For

u dated referen es, the latest edition of the normative doc ment refer red to a ples Memb rs of ISO an IEC

maintain r egister s of c r r ently v ald Inter national Stan ar ds

ISO 6 1:19 7, A ssembly to ls for s rew s an n ts — W ren h an socket o enin s — Toleran es for gener al u e

ISO 14 3:19 2, Metal c an oxide co tin s — Me s rement of co tin thicknes — Micr os o ical method

ISO 2 5 -1:19 9, Sampln proced res for in p ction by atributes — Part 1: Sampln s hemes in exed by

ac e tan e q alty lmit (A QL) for lotby-lot in p ction

ISO 3 5 :19 4, Non-destr uctive testin — Penetrant in p ction — General pr i ciples

ISO 3 8 :19 6, Ste l, non-aloy an low -aloy — Deter mination of de th of decar bu zation

ISO 4 8 :19 6, Ge metrical Prod ct Sp cification (GPS) — Surface texture: Profie method — Rules an

pr oced r es for the as es ment of s r face texture

ISO 5 5 -2:19 9, A erosp ce — MJ thre d — Part 2: Limit dimen ion for b lts an n ts

ISO 7 0 :19 8, A er osp ce — Splne drives — Wr en hin config ration — Metric series

ISO 7 81:—

1)

A erosp ce — Selflock in n ts w ith maximum o eratin temp rature les than or eq al to 4 5 °C —

Test method

ISO 7 7 :19 3, Contr ol c arts — General g ide an introd ction

ISO 7 6 :19 3, Ac e tan e control c ar ts

1) To b p blsh d (Re isio of ISO 7 81:19 4)

ISO 8 5 :19 1, Shewhart control c arts.

ISO 9 2 :19 0, Corr osion tests in artificial atmospheres — Salt spr ay tests

ISO/TR 13 2 :19 5, Guide for the selection of statistical method in stan ardization an sp cification

3 Terms and definitions

For the pur poses of this Inter national Stan ar d, the folowin ter ms an definition a ply

3.1

d finitio do ume t

doc ment sp cifyin al the r eq ir ements for n ts, i.e



metalur gical;

 ge metr i al an dimen ional;

 fu ctional (str en th an temp r atur e clas es)

NOT Th d finitio d cume t may b a Intern tio al Sta d r d, a n tio al sta d rd, or a in-h use sta d r d or dr awin

definite q antity of some commodity man factur ed or pr od ced u der con ition whic ar e pr es med to b u ifor m

NOT For th p r poses of this Intern tio al Sta d r d, a b tch is a q a tity of finish d n ts, of th same typ a d same

diameter, pr od ce fr om a mate al o tain d from th same melt ma ufacture in th co r se of th same pro uctio c cle,

folowin th same ma ufactu n ro te a d h vin u d r go e al th rele a t h at tr eatme ts a d surface tre tme ts

in lu io s

non-metal c p r ticles or i inatin fr om the mater ial man factu n pr oces

NOT Th se p r ticles may b isolate or ar ra g d in str i gs

3.8

critic l d fe t

defect that, ac ordin to ju gement an exp rien e, is lk ely to res lt in hazardou or u safe con ition for

in ivid als u in , maintainin , or de en in up n the con idered prod ct, or that is lk ely to pr event p r forman e of

the fu ction of a major en item

3.9

major d fe t

defect, other than critical, that is lk ely to r es lt in a faiur e or to red ce mater ialy the u a i ty of the con idered

pr od ct for its inten ed pur pose

3.10

min r d fe t

defect that is not lk ely to r ed ce mater ialy the u a i ty of the con idered pr od ct for its inten ed purp se, or that is

a de ar tur e fr om esta ls ed sp cification havin ltle b ar i g on the efective u e or o er ation of this pr od ct

3.1

s mpln pla

plan ac or din to whic one or mor e samples ar e taken in or der to o tain infor mation an p s ibly r eac a decision

NOT For th p rp ses of this Intern tio al Sta d rd, e ch sampln pla sp cifies th n mb r of n ts to b insp cte as

a fu ctio of th size of th b tch a d th ac e ta ce n mb r n mb r of d fectiv items ac e ta le (Ac)

maximum p r cent defective (or the maximum n mb r of defects p r h n r ed u its) that, for pur poses of sampln

in p ction, can b con ider ed satisfactor y as a pr oces aver age

NOT Va a t q alty le el which in a sampln pla cor resp n s to a sp cifie b t r elativ ly hig pr ob bi ty of

ac e ta ce

3.14

lmitin q alty

LQ

^sampln plan& q alty level whic cor r esp n s to a sp cified an r elatively low pr ob bi ty of ac e tan e

NOT 1 I is th lmitin lot q alty ch racte stic th t th co sumer is w il n to ac e t with a low pr ob bi ty th t a lot of this

s lf-lo k in torq e

tor que to b a pled to the n t or b lt to maintain its movement of rotation in relation to the as ociated p rt, the

as embly b in u der no axial lo d an the n t lockin s stem b in completely en aged with the b lt (wo pitc es

minimum pr otr usion, in lu in the en c amfer )

tor que req ired to start u s rew in the n t or b lt with resp ct to the as ociated p rt, w ith the n tlock in device

sti fuly en aged on the b lt, but afer the axial lo d in the as embly has b en removed by u s rewin half a tur n

folowed by a halt in r otational movement

3.19

tig tenin an u tig tenin tor ques w hic the drivin fe ture of the n t has to w ith tan re e tedly without an

p r manent defor mation whic would pr event the a pr opr iate wr en h fr om b in u ed or pr eclu e r e-u e of the n t

4.1.1 Ma ufa turer's approv l

The man factur er s al confor m to the q alty as ur an e an a pr oval pr oced r es defined by ISO 9 0

The pur pose of these pr oced r es is to en ur e that a man factur er has a q alty s stem an the ca a i ty for

contin ou pr od ction of n ts complyin with the sp cified q alty r eq ir ements

Ap roval of the man factur er s al b gr anted by the Certification A uthorities, or their a p inted r epr esentative, w ho

may b the pr ime contr acto

4.1.2 Qu lfic tio of n ts

The purp se of q alfication in p ction an tests of n ts is to c eck that the desig an man facturin con ition

for a n t alow it to satisfy the r eq ir ements of this Inter national Stan ar d

Qualfication of the n ts s al b granted by the Certification A uthorities in the purc aser's cou tr y, or their

a p inted r epr esentative, who may b the pr ime contr acto

4.1.3 Pro u tio a c pta c of nuts

The purp se of prod ction ac e tan e in p ction an tests of a n t is to c eck , as simply as p s ible, u in a

method whic is inexp n ive but the most r epresentative of the actual con ition of u e, with the u certainty

in er ent in statistical sampln , that the n ts satisfy the r eq ir ements of this Inter national Stan ar d

Pr od ction ac e tan e in p ction an tests s al b car r ied out by the man factur er , or u der his r esp n ibi ty

The man factur er is r esp n ible for the q alty of the n ts man factur ed

4.2 Qual fic tion inspe tion a d te t conditions

Qualfic ation in p ect ion an tests (req irement s, method , n mb rs of n ts) are sp cified in Ta le 1 They s al b

car r ied out on:

 e c typ an diameter of n t;

 10 n ts selected fr om a sin le b tc by simple r an om sampln

The test programme may p s ibly b red ced, or q alfication of a n t granted, w ithout in p ction or testin ; an

s c decision s al b b sed on the res lts o tained on simiar typ s an diameter s of n ts provided that the desig

an man factu n con ition ar e identical

The in p ction an tests s al b re e ted on an n t if the s p ler or the man facturin con ition have

c an ed

Qualfication in p ction an tests ar e s mmar i ed in T able 2

4.3 Production ac e ta c ins e tion a d te t c nditions

Pr od ction ac e tan e in p ction an tests (r eq irements, method , n mb rs of n ts) are sp cified in Ta le 1

They s al b car ried out on e c b tc Nuts from the b tc to b tested s al b selected by simple ran om

sampln

Eac n t may b s bjected to sever al in p ction or tests

The n ts to b s bjected to destru tive in p ction or tests may b those on whic non-destru tive in p ction or

tests have b en car r ied out

If a mor e str i gent in p ction is de med neces ar y, al or p rt of the q alfication in p ction an tests may b

p rformed d rin the prod ction ac e tan e in p ction an testin In this case, the n mb r of n ts s bmited is

the same as that s bmited for q alfication in p ction an tests

Batc es declared u ac e ta le afer the pr od ction ac e tan e in p ction an tests s al b s bmited for

re-in p ction or testin only afer al the defective u its have b en r emoved an /or defects have b en corected In this

case, the atribute(s) whic cau ed the r ejection s al b ver ified u in a sample of twice the nor mal size with the

same n mb r of defective items ac e ta le

Pr od ction ac e tan e in p ction an tests ar e s mmar i ed in T able 2

4.4 Use of "statistic l proce s c ntrol (SPC)"

W her e a c ar acteristic is o tained by a contr oled statistical proces , the man factur er has the p s ibi ty, in or der

to declar e confor mity of the c ar acter i tic, of r efr ainin fr om the final s stematic sampln pr ovided for in this

Inter national Stan ar d, if he is ca a le of formaly ju tifyin this c oice by u in ISO/TR 13 2 an the stan ard

q oted in it as a b sis

This ju tification w il in lu e the folow in phases:

 analy is of the pr od ct's key c ar acter i tic ;

 analy is of the r i ks for e c implemented pr oces ;

 deter mination of the p r ameter s an /or c ar acter i tic to b r esp cted u der SPC;

 deter mination of the ca a i ties of e c pr oces ;

 dr awin up an in p ction plan an integr ation in the man factu n pr oces ;

 dr awin up of r outes an contr ol c ar ts (ISO 7 6 , ISO 7 7 , ISO 8 5 );

 u e of contr ol c ar ts for data con oldation;

 deter mination of the au its to b r un an the contr ol to b car r ied out to en ur e r ela i ty of the dev ice

To b u a le in prod ction, this proces s al have b en valdated b forehan by the q alfyin b d , either d r i g

the q alfication phase, or a p steriori ac ordin to the case, by analy in the ju tificatory fie an the res lts of the

q alfication in p ction s c as pr ovided for in clau e 5

The tec nical r eq ir ements of this Inter national Stan ar d ar e given in Ta le 1

They complement the r eq irements of al other stan ar ds or sp cification referen ed in the definition doc ment for

the n t

NOT Th ate tio of th users of this Intern tio al Sta d r d is dr aw n to th fact th t if th re is n Intern tio al Sta d r d

sp cifyin th meth d to b use , a prior a re me t is n ces ary b twe n th user a d th ma ufactur er with resp ct to th

folowin insp ctio s a d tests:

 sp ctro ra hic a aly is or sp ctr os o ic a aly is of th material (se 5.1.1)



micro r ap ic insp ctio of th str ucture of th mate al (se 5.1.2)

 insp ctio for car burizatio or d car bu zatio (se 5.1.3)

 ma n tos o ic insp ctio for sur face dis o tin ities (se 5.1.4)

 ma n tic p rme bi ty insp ctio (se 5.1.6)

 insp ctio by ch mical r ea e t to d ter min typ of sur face co tin (se 5.2.2)

 tactie insp ctio or insp ctio usin a profiometer to d ter min sur face r ou h es (se 5.3.2)

p r tial d car bu zatio is

p r mis ible pro id d th t

sur face co tin sh l b

within th lmits sp cifie

in th d finitio d cume t

thick nes of sur face

co tin s In case of d u t

micro ra hic insp ctio

in ac ord nce with

a ainst corosio

test in ac ord nce with

ISO 9 2

Exp sur e for 3 6 h

with ut sig s of corosio

— Nuts w ith loc in by

pla tic in ert

bih x gon l driv

Minimumtolera ces

sp cifie in ISO 6 1

b) Spln driv

Maximum mate al

co ditio of female

wre chin d vice in

ac ord nce with

from withsta din

co tin o sly, with ut