.r\'I VDUAU(,IndustriesAssociation

NATIONAL AEROSPACE STAN DARD

O COPYRIGHTi95SAEROSPACE INDUSTRIES ASSOCIATION OF AMERICA. INC. ALL RIGHTS RESENVED

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Generelly a{y rale tbreaded ualt aey be nade gelf,locklngl. I 6ee IS1598l for llEltatlons of use

Ihe lnlonatloa lncluded ln tbls desigr standard sball be appllcable to all eelf-IocLlng nele threaded parts rbeo speclfied. ftese detells sDply only io the locklngeleaent and do not define any otber feature of tbe fssteuer.

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2.1 I rlolrru (5 thread pltches) (Flgure 1) E ttreglon of nluhun engageoent of naletbreade rltb full feoale tbreeds required to oeet III,-F-182{0. De locklug eleaeotlltbln X reglon lust develop tbe requtred torque rben teeted per IIL-F-18240. 1}eleogtb or dlueter of locktng eleoent nay be Eore or lees tb8! X provldlng ell otherreo:lreaents 8re Eet.

2,2 y (Flgure l) = One cooplete tbread plus ulthreeded portlon of end, 1. e. chs&feraad aay erteoelon beyond thread area. hr ease ln startlug, tbe locEi.ng eleoent sbal.Inot be effecttve rltbln tbls erea.2,3 D (Fi.gure 1) = Xexj.nuo ua.Jor thread di.aueter, lbe locktng region of tbe parr,Dust paas freely or ritb finger pressure tbroueh s rlng gage of a dlaneter egual to

^ tbe oarlau.n rejor thread diaueter of the part.

S) 2.4 IIL-F-|B}4O does not cover all thread deslgnetlons or lenSths less tban X.Iinloun requlreuent for sucb confieuratlons 1s a posltlve lndlceti.on of torqrre.2,5 fbe locking action results fron the frlctlon on the tbreeds l80o froo theIocling eletent.2,5,1 lhe locklng eleoent sball be of a type approved under (pL tg240 and in-stalled by an autborized Droducer,2.5,2 lbe locking eleoent sbellproduce a torgue egual to tbe value establishedby XIL-F-182'10 lben ueed rith the oale threeds iu aa engageueut rith plain feoaletbreads througbout the region X, ercept as noted La 2,4,2.5,3 lte requlreoents of llIL-F-18240 are linlted to zEOT narluuD teoperature,

lbree basic types of eleoents ere avallable, as shom la Figure 2:

lype fl lndlcates aa heragoaal or round pellet.8pe l, lndicates e longitudinel strip.tpe P ludlcetee a petch FDe.hen Dosslble epeclly type es OPTIOI{AL.

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FASTEfiERS, I|ALE THREADED, SELF-LoCXtH6

CLASSIFICATION

DES IGI{ STAIIDARD

NAS I 283SHEET I OF 4

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NATIONAL AEROSPACE STAN DARD

O cop/nlcHTl968A€RGPACE rNDusTFres AssoclATloN oF AMER|CA, tNc. ALt RtcHTS RESERVED

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2'7 ldentlllcatioD Isrklng. tlen standard parts sre rerorled Der Flgure L tbeprrts are to be ldentlfted tttb tbe addltion of sir or mre ralged or depreesed doteln a clrcular pstten, If rerorked to tbts sDecMcatlon to s speclal ]ocatlon rrshom W sectlo! 3, the orlglnal p8rt nuob€t ls to be reuoved aad reglaced by ealdentillcrtlot rg sDecltr,ed bt tbe hStneertng drarln3.Detall drari,ng lntorrrtlou: lte detell lrle tbreaded part dratlng aay lnolude ooeof tbe notes as sq3eeled.lo gerngraph 3.t or Day coopletely deflne the locklagelaent by bcluding tbe Inloraatlon e8 supplled in paragrepb 3.2, 5,3, g,{,-oi S.S rgapplicsble.

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Flgurc 23.1 F use o! a note slollsr to one o!-those suggested ln Flnrre 2, the prpducerrtll detemlse the dj,aneter or leugth aad locail,on oi tue eieoeui aaa supply-e-prrtas deecrtbed lu paragrrph 2,

3,2 Insert tyPe opttongl: tpcEte regl9n X (S pttcbes) and speclfy value tor y(rl$re l). Add note such !s .provlde locktng elelent pei Nrsrzag oDlloual type."

9..2.1 Il locllng elerent nust be loccted dtaletrlcelly ln reletion to otberdlrensloae on tbe Dart, gbqs as tn Fllure 3.

3.3 Insert tyDe L:as sbom 1! Flgure {.

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heu the longltudlaat strlp type lssert ls requlred locateAdd note such as ,hov1d€ locllng eleaeut per type L".

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3,3. 1 If locking element nust be in a spectfled locationfeatures of tbe part, sbor as in Figure 3 or Figure 6.

3.3,2 lte lusert length will be as specifled ln Tab1e Ies lu Ftgure 5.

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Figure ? Fieure I3,3.3 lhe installation of type L locklng element noroally reguires a oilliug cutbelow tbe root of the thread. If thls cut c""not be tolerated in a portion of thepart adjasent to tbe strip, the dra'rihg oust specify as in Figure ?.

3.3,4 If tbe part is synroetrlcEl, lndicate the enteriug thread as ln Figure g.

3,4 rnsert type N: when tbe pellet type hsert is reguired, eltber heragonalor round, locete es sbom tn Figure 9 and edd I Dote such as 'Provide loctini.eleoentper N4,S1283 type N'.

Figure 9 Fisure Ll

3,4' 1 If locking eleoent nust be in e spectfied locatlon ln relatlon to otherfeatures of the part, show as i.n Figure 3 or Finrre 10.

3,4,2 Pellet dianeter for round type, or pellet diuension across flets forbexagonal type rill be as speclfied in Table I unless otherflise specified.3.4.3 rf Eultlple pellets are required, show locetions deslred. Fi.gure 11.

3.5 Petcb type P: f,tten ttte patcb tyDe eleoent is required, locete as shomln Fl8;ure 12 and adrl a note sucb as: oProvide lockiug eleoent per NA.S1283, type P. ,3.5.1 If tbe loc[ing eleoent oust be in a specified location in relation tootber features of tbe part, sbor as in Figure 3 or 1,4.

3.5,2 the pstch length rill be as specified in Tebleas in Fieiure 13.

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Copy!i9ht, 1968, Aerospace Industrres Associatton cJ AnericB, Inc.

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NATIONAL AEROSPACE STANDARD

4.0 the installation of lrne t and type N lochlng-eleoent require a drilled bole orslot tbat ertends belor the root of tbe tbread. rte nlnlnun rart iaiclu;;;-";'tubular parts for tbread slzes.0600 tbnr .1.120 eguals tbe tbreed i.pir,-pir"-.oro.F0r.1250 thnr.2500 equals the thread deptb plus.0Z0. Fbr.3125 tU"i i,iiOir-ii.olnloun rall equals tbe_thread deptb DIus .030. tlese ltuitatlons "r"-oJi-rppliceureto tbe type P locking elenent.

Iating Parts.5.1 Additioaal dlaoeter to natlng holes for clearance is not reguired.Paragrapb 2.3.5.2 lbe entering edge of natlng hole or thread sball be chaofered 90o to 100sto a diareter egual to tbe naxiuuo oaJor diaaeter of tue inread pror-.oio iiliii,

TABLE Ithe locking eleoent dloenslons shom are spproxioate and for engineeringinfomation only. If otber than tbese dioensions gre speclfied by the r1esigner,the values of [IL-F-18240 rill not lecesserlly apply.

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Fbr larger slzes aot llsted lD urL-F'-18240 specify t'equlred torque on drawiag.

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Copyrlght, 1958, Aerospace Industries Association ol Amenca, lnc,