Bsi bs 2a 295 2000 (iso 7481 2000)

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ThisBrit ishSt and rd,havin

Amendmentsis ue sincepublcation

Am d.No Date Com m en ts

T h isBri ti s hStan dardreprodu c esverb timI SO74 81:2 0 an di m plem en tsitasth e

U Kn ation als tan dard.I ts u pers edesBSA2 5:19 5wh ichi swi th draw n

T h eU Kp rti cipati onini tsprep rationw asen tru stedbyTe h n icalCom m i tte

ACE/12,Aeros pac efas ten er an dfas ten in gsystem s ,toSu bc om m i tte AC /12/1,

Aerosp c fas ten er an dfas ten in gsys tem s(i n tern ation al),w h ichh asth e

resp n s i bil ityto:

Ðai den qu i rer tou n ders tan dth etext;

Ðpres en ttoth eres pon sibl ei n tern ation al/Eu ro ea com m itteean yen qu iries

o th ein terpretation ,orpro osalsforch an g e,an dkeepth eU Ki n terests

T h eBritishStan dardswh i c hi m pl em en tin tern ation alorEu ro ea pu bli c ation s

referedtoi nth i sdocu m en tm aybefou n dinth eBSIStan dardsCatalog u eu n derth e

s ecti onen titledªI n tern ation alStan dardsCoresp n den c eI n dexº,orbyu sin gth e

ªFi n dºfac i li tyofth eBSIStan dardsElectron icCatal og u e

ABri ti shStan darddoesn otpu rp rttoi n cl u dea th en ec s arypro i sion sofa

c on tract.U ser ofBri tishStan dardsareresp n s i bleforth eircore ta pli cation

Complancewith aBritishStand rdd esnotofitselfconferimmunity

f om le a lo lga tions

S mmaryofp g s

T h isdocu m en tc om pri s esafon tco er,a in sidefon tco er,th eI SOtitlep g e,

p g esi itoiv,p g es1 to19an dab ckc over

T h eBSIco yrig h tn oticedisplay di nth i sdocu m en tin di cateswh enth edocu m en t

wasl astis sued

A erospace — Nuts, self lock ing, with

A éronautiq eetesp ce—Écrou àfreinageinternedontlatemp rature

maximaled'uti sation estinférieureouégaleà4 5°C—Méthodesde

contrôleetd'es ai

Contents Page

Foreword iv

1 Sc pe 1

2 Normativ refere c s 1

3 In pe tio sa dte ts 2

3.1 Hard e ste t .2

3.2 Be rin s rfa es u re e ste t 2

3.3 A xial oa te t .4

3.4 Wre c in fe turete t .6

3.5 Stre sembrit leme t te t 7

3.6 Torq e-o t te t .8

3.7 Te tofn rotatio ofthec ptiv wa h r 9

3.8 Pu h-o t e t 10

3.9 Self-lo kin torqu at ambie t emperature 12

3.10 Self-lo kin torq eatambie t emperatureafterh ats a atma imumoperatin temperature 14

3.1  Perma e ts t e t 15

3.12 Vibratio te t 16

ISO(heInternationalOrganization forStan ardization)isawor l widefederation ofnational stan ard b dies(ISO

memb r b dies) The work of pre ar i g Inter national Stan ard is normaly car ried out thr ou h ISO tec nical

commite s Eac memb rb d interested in as bject orw hic atec nical commite hasb en esta ls ed has

ther i ht ob r epr esented on thatcommite nternational organization , gov ernmental an non-governmental, in

laison w ith ISO, also take p r t in the w or k ISO cola orates closely with the International Electr otec nical

Commis ion (IEC)on al matersofelectr otec nicalstan ardization

Inter national Stan ard aredrafed in ac ordan ewiththerulesgiv enintheISO/ IECDirectives,Par t3

Dr af Inter national Stan ard ado ted bythetec nical commite s are cir culated to the memb rb dies forvotin

Publcation asan InternationalStan ardreq iresa proval byatle st7 %of hememb rb diescastin av ote

Atention is draw n tothep s ibi tythatsome of heelementsof this Inter national Stan ar d mayb the s bjectof

p tentr i hts SOs al notb heldr esp n ibleforidentify in an oral s c p tentrig ts

International Stan ard ISO7 81 was pre ared by Tec nical Commite ISO/TC2 , A ircraf an sp ce vehicles,

Subcommite SC4, A erosp cefasteners stems

This secon edition can els an re laces the fir st edition (ISO7 81:19 4), w hic has b en tec nicaly revised

Nota ly ,atest ornorotation of heca tiv ewas erw asad ed

INT ERNAT IONALSTANDADR ISO 18 7 :(0 0 )E

1Scope

This Inter national Stan ard sp cifies test method for metric selfloc in n ts w ith MJ thre d inten ed for u e in

a r osp ce con tru tion at maximum o eratin temp r atures les than or eq al to 4 5°C It des rib s the test

devicean themethod fore c test

It a ples to self loc in n ts as defined a ov e, provided that the r elev ant doc ments (dimen ional stan ar d,

draw in ,proc rementsp cification,etc.)refertothisInternational Stan ard

ThisInternationalStan ards al b u edin conju ction w ith ISO5 5

NOT E T his Internatio al Sta nd r d o ly sp cif ies tests f or a mbie t a d elev ate temp ratur e a plcatio s T ests for

a plcat io satles th nambie t emp ratures,f orex amplecryo e ic,sh l b asa re du o b tw ee selera dp rch se

2Normativ e references

Thefolow in normativedoc mentscontain provision whic , thr ou h r eferen ein this text,con tituteprovision of

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

publcation donota ply However, p rties toagre mentsb sed on this Inter national Stan ard ar een our aged to

inv estigate the p s ibi ty of a ply in the most recent edition of the nor mativ e doc ments in icated b low For

u dated referen es, the latest edition of the nor mative doc ment refer red to a ples Memb rs of ISO an IEC

maintainregister sofc r rentlyv aldInter national Stan ard

ISO6 1:19 7,As emblyto lsfors rew san n ts—Wren han sock eto enin s—Toleran esforgeneralu e

ISO10 4:19 9, Metal c materials—Hard es test— Rock wel s p rficial test s ales 15N, 3 N, 4 N, 15T, 3 T

an 4 T)

ISO5 5 -2:19 9,A er ospa ce—MJt hr ea ds—Pa r t2:L imitdimen ion f orb lt sa ndn ts

ISO5 5 :19 9, Aerosp ce— Nuts, selflock in , w ith maximum o eratin temp rature les than or eq al to

4 5°C—Proc r ementsp cification

ISO6 0 -1:19 7, Metal cmaterials—Vick ershard es test—Part1:Testmethod

ISO6 0 -1:19 9, Metal cmaterials—Rock wel hard es test—Part1: Testmethod (s ales A , B, C, D, E, F, G,

H,K , N,T)

ISO7 0 :19 8,Aer ospa ce—Splned v es—Wr en hin c onf ig r a t ion—Met r icser ies

3Inspections and tests

3.1Hardne ste t

3.1.1Pro e ure

Thec oicede en son theconfig rationof hen tan avaia leeq ipment.Theauthorizedproced resare:

¾Roc w el hard es in ac ordan ew ithISO6 0 -1;

¾Vic ershard es HV5toHV10 in ac ordan ewithISO6 0 -1;

¾Roc w el s p rficialhard es in ac ordan ewithISO10 4;

¾micr ohard es

3.1.2Meth d

Thistests al b car ried outatambient emp rature

Theme s rementzone (b arin s rface, acr os flats, u der side of an horn t lu s, etc.) s al corr esp n to the

folow in con ition :

a) thic nes atle steq alto10timesthep netr ation de th;

b) p ralelsm w ith r esp ct ob arin s rfacenotgre terthan3°

Shouldthisnotb p s ible, car ryout histeston ac tsectionafermouldin then tintothermosetin resin

Removeal p s ibleco tin (protection,lubr i ation,p int, etc.)intheme s r ementzone.A lig theb ar i gs rface

to o tain the req ir ed relation hip These two o eration s al not gener ate an he t la le to modify the

c aracter i tic of hematerialcon titutin then tb in tested

Car ryout hetestan then c ec conformitywiththereq irementsof hedimen ionalstan ard ordraw in

Nutss bjectedtothistests al notb u ed again

3.2Be ring s rfa es uare e ste t

3.2.1Te td vic

Thetestdev iceisi u tratedinFig re1

Thetestdev icein lu esthefolowin elements:

a) a thr eaded man r el w ith en in ac ordan e w ith ISO5 5 -2, with the ex e tion of the pitc diameter whic

s al b in ac ordan ewiththevaluessp cifiedinTa le5forthemaximumman rel;

b) a colar sldin on the plain p rtion of the thre ded man rel whose external diameterB is at le st eq al to

referen e dimen ionA fortypeI I an Vn ts in Fig r e2an eq al toreferen e dimen ionA forty peI an

IVn tsin Fig r e2;

c) an a pro riatefe lergau e

Dime sio sinmi metr es

Fix da c orn ts Flo a tin a nchorn t s

andg n cha nne ln ts

Figure2

Thetests al b cariedoutatambient emp rature

Forflo tin n ts,extract hen t rom thecageorc an el

Lubricatetheman rel an n t orthre ded p rt thre d asstated in Ta le1 (ifneces ary) Screw , with orw ithout

aw r en h,thethr eaded man r el ntothen torthre dedp rtuptoaminimum en agementof hre turn

Movethecolarintocontactw ith theb arin s rface

Evaluate the outofs uar enes by me n of a fe ler gau e w hose thic nes corr esp n s to the p rmis ible

s uarenes err orp rmitedbythedimen ionalstan ard,thedraw in orthepr oc rementsp cification

3.3Axial loa te t

3.3.1Te td vic

Thetestdev iceisi u tratedinFig re3

Thetestdev icein lu esthefolowin elements:

a) ab arin plateinste l,he t re tedtoahar dnes W4 HRC;

b) aconical was er(ortestin cou ter su kn ts);

c) ab ltwith c ar acter i tic asfolow s:

1) thre d :inac ordan ewith ISO5 5 -2,

2) ten iestren th clas :gre terthanthatof hen tu dertest,

3) mater ial an co tin :nosp cificreq irement

3.3.2Metho

Theaxial o d istran mitedtothen tbytheb lt,then tr estin ontheb ar i g plate

Forcou ters n n ts,aconical was erisinter posed

3.3.2.1 8 %te t

Thistests al b car ried outatambient emp rature

Lubricatetheb ltan n t hre d asstated inTa le1 (ifneces ary) As embletheb arin plate, an p s iblythe

conical w as er, ontotheb lt A ssemblethen tan me s retheloc in tor quewhen theprotru ion istw o pitc es

minimum (in lu in c amfer)

Position theas emblyon theten iemac ine Ap lythelo dslowlyan progres iv ely Red cethelo dslow lyan

pr ogres ivelywhen thevalueq oted inthepr oc rementsp cification hasb enre c ed

Remove the as embly fr om the ten ie mac ine Un cr ew the n t a half urn an ce se movement, then again

u s rewan me s rethebre kaw aytorq e

Removethen t, thens bmitit oavis al examination, an ifneces ary , an examination atamag ification of´10

afersectionin ,toc ec confor mitywiththereq irementsof heproc r ementsp cification

Dime sio sinmi metr es

0,100,2

Stainles ste l

None Stainles ste l Siver

Sy ntheticoi

3.3.2.2 10 %te t

Thistests al b carr ied outatambient emp ratur e

If the test in lu es a he t so k, then he t he n t an maintain it at the temp rature q oted in the proc r ement

sp cification Take the n t from the oven an alow it to co l slow ly to ambient temp r ature, then proce d as

folow s

Lubricate the b lt an n t thre d as sp cified in Ta le1 (if neces ary), as emble the b arin plate an , if

r eq ired, the conical w as er, onto the b lt As emble the n t w ith a protru ion of tw o b lt pitc es minimum

(in lu in c amfer)

Position theas emblyon theten iemac inean a ply thelo d slow lyan progres ively Red cethelo d slow ly

an progres ivelyw henthevalueq oted in theproc rementsp cification hasb en r eac ed

Remove the as embly from the ten ie mac ine Remove the n t, then s bmit it to a vis al examination, an if

neces ary, an examination atamag ification of ´10afersectionin toc ec conformityw ith thereq ir ements of

theproc rementsp cification

Nutss bjectedtothistests al notb u ed again

3.4Wre c ing fe turete t

Thistesta plesonlytow ren ha len ts

3.4.1Te td vic

Thetestdev iceisi u tratedinFig re4

Thetestdev icein lu esthefolowin elements:

a) abloc ofste l, he t tr eatedtoahard es ofW 4 HRC;

b) ab ltwith c ar acteristic asfolow s:

1) thre d : inac ordan ewith ISO5 5 -2,

2) ten iestren th clas :nosp cificreq irement,

3) mater ial an co tin :nosp cificreq irement

NOT E Anyoth rd v icewhic hpr ev entsth rotatio of h n ta dalow sth sp cif ie torq etob a ple is ac e t able

Forinsta nce:

¾ n tweld do ablockoft hesamemate al, h as emblyb in h at-treat edtoth correctlev el;

¾ n ts mo nte in co nter -rotat io o a thre d d ro of str en th clas a pr opria te to h ld th req ire torqu s with ut

3.4.2Meth d

Thistests al b carr ied outatambient emp r ature

Maketwoflatson theflan eof hen tsothatithasacle ran eof0,0 mm to0,1 mm in idetheslot, lubr i atethe

b ltan n t thre d as sp cified in Ta le1 (if neces ary) n ert hemodified n tinto the slot As emble the b lt

an moderatelytig ten it, then as emblethebloc intoav ice

Re e t hefolow in o eration then mb rof imessp cified intheproc rementsp cification:

Ap lythetorq etothen t, in atig tenin movement, as q oted in theproc r ementsp cification, w ith theaid ofa

soc et w ren h w ith an o enin toleran e in conforman e w ith ISO6 1 or ISO7 0 Remove, then re lace the

soc etw ren h A pplythesametorq etothen tinan u tig tenin direction

Finaly, dismantletheas embly , then s bmit hen t oavis alexamination an ,ifneces ary , toan examination at

amag ificationof

´

10afersectionin toc ec conformityw iththereq irementsof hepr oc rementsp cification

Nutss bjected tothistests al notb u ed again

3.5Stre sembr it leme t te t

This test a ples only to n ts he t r eated to a har dnes W4 HRC ex e t for o p site in ication giv en in the

proc rementsp cificationordefinitiondoc ment

3.5.1Te td vic

Thetestdev iceisi u tr atedinFig re5

Thetestdev icein lu esthefolow in elements:

a) abloc w ith p ralelfacesinste l,he t re tedtoahard es W 4 HRC;

b) ab ltwith thefolowin c ar acteristic :

1) thr ead: in ac ordan ew ithISO5 5 -2,

2) ten iestren th req irementgre terthanthatof hen tu dertest,

3) material an co tin : nosp cificr eq irement

3.5.2Meth d

Thistests al b caried outatambient emp ratur e

Hold the b ltby the he d, lubricate the b lt an n t thr ead as sp cified in Ta le1 (if neces ary), as emble the

bloc an as emblethen t ob tested

Dime sio sinmi metres

Tig tenthen t othetor queq oted in theproc r ementsp cification with theaidofasoc etw ren h in ac ordan e

with ISO6 1 orISO7 0 K ee then tu deraxialten ionforthep riodq otedin theproc rementsp cification

At heen of this p riod, dismantletheas embly, then s bmit hen t oav is al examination an , ifneces ary, to

an examination at a mag ification of ´10 afer sectionin to c ec confor mity with the req ir ements of the

proc rementsp cification

Nutss bjected tothistests al notb u ed again

3.6Torque-outte t

Thistesta plesonlyton tsmadefr om morethan onep rt, eitherbydesig (lo tin an horn tsorgan c an el

n ts), orbythene d ofman facture( ixed an horn tsw hoseb d is as embled totheb se late bybr azin or

cln hin )

It aims to c ec that the retention device is a le to resist rotation of the thre ded p rtion d rin tig tenin an

u tig tenin

3.6.1Te td vic

Thetestdev iceisi u tr atedinFig r e6an dimen ion aregiven inTa le2

Thetestdev icein lu esthefolow in elements:

a) afixin plate;

b) as oulderedman relthre ded in ac ordan ewithISO5 5 -2

1)

c) aloc n t hre ded in ac ordan ewithISO5 5 -2;

d) rivetsorb ltstofixthen t nosp cificreq irement

3.6.2Meth d

Thistests al b carr ied outatambient emp r ature

Atac then torp rtionofc an el tob tested ontheplatebyme n ofrivetsorb lts.Lubr i atetheman r el an

n t hre d as sp cified in Ta le1 (ifneces ary ) Screwin the man rel sothat he s ouldercontactsthe b d of

the n t (on b ar i g s rface or b tom of cou terb re) Ap ly the tor que to the n t, in a tig tenin mov ement, as

q otedintheproc rementsp cification

As embletheloc n tan a plytoit hesametorq eintherev ersedir ection

Dismantle the as embly , then s bmit the n t as wel as the cage or the c an el to a vis al examination an , if

neces ary , toan examination atamag ification of´10afersectionin toc ec conformity w ith thereq irements

of hepr oc rementsp cification

Nutss bjected tothistests al notb u ed again

Dime sio sinmi metr es

a

T hr ea e le gt h:»3D

Figure6

3.7T estof norotationofthec ptiv ewa her

Thistesta plesonlyton tsw ithca tiv ewas er

1) Ash uld redsle v emo nte o ab ltmayalsob use