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NATIONAL AEROSPACE STAN DARDO COPYRIGH'I'2013 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC, ALL RIGHTS RESERVED

USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTiFYCoNFoRNIANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. ALA MAKES NO REPRESENTATION OR CLArM RESPECTING (1) THE SUITABILITY OF]TEIVIS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TMDEMARKS RIGHTS.

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DESJGN OF WRENCHING PAD FACES BETWEEN WRENCHING CORNERS ISOPTIONAL IF THE WRENCH]NG CORNERS ARE WITHIN THE L]MiTS OF E, WAND C BEFORE LUBRICATION AND THE UMIT OF THE AREA BETWEEN THECORNERS IS WITFIIN THE MAXIMUM LIM]T OF W FOR THE E LENGTH OFWRENCHING CORI{ERS, BEFORE LUBRICATION

RADIUS,CHAMFEROR SQUARE I -G///

TOOL MARK ORDISTORTIONPERMISSiBLE INLOCKING AREA

COUNTERSINK,COUNTERBORE, ORMDIUS RELIEF TOTHREAD WITHIN THELIMITS OFDIMENSIONS OD & G

TABLE I - DIMENSIONS

@ cover-rrElY REVTsED

Reproduced By IHS

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SIZEDASF

NO,

THREAD

/3tQIA

MAX@B

MIN MINQD E

MIN

t6t

F

MIN

t7t

U H J

MINW

tstX

t4t/VRENCHINC

TORQUEIN-LBF MIN

tB/

AXIALSTRENGTHLBF MIN

t9l

WTLBSi 10C

MAXMIN MAX MIN \4AX MIN \4A) MIN

02.0860-56UNJC-38

.t6i .LJ/ .138 .106 .086 .04s ,01s .02L ,004 .100 ,080

.010

.Lzi .L22 ,002s 5 660 .020

04.LL20-40UNJC-38

20( .L76 .L7L .L42 .TL2 05c n)9 .027 .005 .L2s .103 .15t .150

.003

10 1,1 1o ,0s0

06.1380-32UNJC.3B

244 .2Lz .207 .16€ .138 .055 039

.031 .006

.L4I 1i5 ,19C .181 20 L,670 .080

08.L640-32UNJC-38

.29C ,26( .244 .L94 .t64 .060 .04L.188

. LZJ.01

.22L .2r 30 2Ael .150

3.1900-32UNJF-3B

,33C 29C .277 .220 't or 065 .043 .t54 .252 .24 OU 3,470 .180

4.2500- 28UNJF-38

42C ?RF .34i .280 .250 .090 .057 .03€ 00, .2t9 .204 .UI:' .316 .304 1s0 6,20Q .350

5.3125-24UNJF-38

,520 .482 .4L9 .342 .3L2 .LaC 077.042 ,00€

.266 .251 .023 ,378 .367.004

330 9,820 .600

o.3750 24UNJF.3B

.OZU .575 .49L .405 .375 .L25 089 ,282 .267 .030 .440 .430 530 15,200 .800

THE INITIAL REL.EASE OF THIS DOCUMENT SUPERSEDES MS2IO42, REVISION M. PART NUMBERS REMAIN M527042.

CUSTODIAN

NATIONAL AEROSPACE STANDARDS COMMITTEE

REVISION

1PROCUREMENTSPECIFICATION

NASM25O27

TITLE

NtuT, SELF-LOCKING,450o F, REDUCED HEXAGON,REDUCED HEIGHT, RING BASE, NON-CORROSTON

RESISTANT STEEL

CLASSIFICATIONPART STANDARD

NASM21042SHEET 1 OF 4

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NATIONAL AEROSPACE STANDAR.D@ COPYRIGHT 2013 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED

usE oF oR RELIANCE UPON THIS DOCUMENT OR ANY NATTONAL AEROSPACE STANDARD IS ENTTRELY VOLUNTARY. AIA DOES NOT QUALIF/ S;UPPLIERS OR CERTTFYCONFORMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING ( 1) THE SUITABILITY OFITEMS FOR ANY PARTICUI.AR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABIL]TY THERETO OF PATENT OR TMDEMARKS RIGHTS.

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MATERIAL:

STEEL: UNS G10350 (AISI C103s) PERAMS5080, AMS-QQ-S-700UNS G10420 (ArSr C1042)UNS G10500 (AISI 1050) PER AMS5085UNS G40270 (AISI 4027) pER ASTM A322UNS G40370 (AISI 4037) pER ASTM 4322, 4108 A33+, 4519, A547, AMS6300UNS G86300 (AISI 8630) pER AMS62B0, AMS6350 6355, AMS6360 653g, A|N4S6550UNS G87400 (AISI 8740) pER AMS6322, AMS6323, AMS6325, AM56327, AI\456358

HEAT TREATMENT:

DEVELOP BASIC MATERIAL PROPERTIES WITH CONTROLS PER AMS2759, HARDNEISS TO 49 HRCMAX.

FINISH:

PLATING, CADMIUM PLATE IN ACCORDANCE WITH AMS-QQ-P-416, TYPE II, CLASS 2,FOR DRY FILM LUBRICATED NUTS, TYPE AND CLASS ARE OPTIONAL IF THE NUTS I\4EET THE SALT

SPMY REQUIREMENTS OF AMS-QQ-P-416, TYPE II.

LUBRICATION:

DRY FILM OR NON-DRY FILM IN ACCORDANCE WITH NASM25O27. OTHER LUBRICA,NTS SHALL BE

SOLUBLE IN THE CLEANER SPECIFIED IN PROCUREMENT SPE:CIFICATION.

CODE:

THE PART NUMBER SHALL CONSIST OF THE BASIC MS NUMBER FOLLOWED BY A DIASH NUMBERFROM TABLE I.

LETTER"L" BEFORE FIRST DASH NUMBER DESIGNATES DRY FILM LUBRICATED NUTS,

EXAMPLES OF PART NUMBER:

M52I042L4.2500-28 NUT, CADMIUM PLATED, DRy FILM LUBRICATED.MS2IO42-4.2500-28 NUT, CADMIUM PLATED, NOT DRY FILM LUBRICATED.

NOTES:

(1) DIMENSIONS IN INCHES AND APPLY AFTER FINISH UNLESS OTHERW]:SE SPECIFIED.

(2) DTMENSTONS AND TOLERANCTNG pER ASME y14.5M-1982.

/3/ THREADS BEFORE LUBRTCATION pER ASBB79.

I4I BEARING SURFACE SHALL BE SQUARE WITH PITCH DIAMETER WITHII\ "X" WHEN ]VIEASURED INACCORDANCE WITH NASM25O27.

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REViSION

INASl"l21042

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NATIONAL AEROSPACE STAN DARDO COPYRIGHT 20I3 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA" INC, ALL RIGHTS RESERVED

USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUAUFY SUPPUERS OR CERTIFYCoNFoRMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUTTABILmY OFITEMS FOR ANY PARTICULAR APPLICA IION OR (2) THE EXiSTENCE OF OR APPLiCABILITY THERETO OF PATENT OR TMDEMARKS RIGHTS.

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/51 DIMENSIONIS APPLY PRIOR TO DEFORMATION OF LOCKING FEATURE.

/61 MINIMUM LENGTH OF EACH WRENCHING CORNER.

17I MINIMUM D]ISTANCE FROM THE WASHER FACE OF THE NUT TO THE BEGINNING OF THE MINIMUMLENGTH *E'OF

EACH WRENCHING CORNER.

IBI NUT SHALL I]E TESTED FOR WRENCHING TORQUE BY THE USE OF A BOX OR SOCKET WRENCH.

/91 TEST BOLTS SHALL BE 180,000 pSI MrN.

(10) SURFACE TEXTURE: SURFACE TEXTURE IN ACCORDANCE WITH ASME 846.1 UNLESS oTHERWISESPECIFIED THE SURFACE TEXTURE SHALL NOT EXCEED 125 MICROINCHES,

(11) REMOVE ALt. SHARP EDGES AND BURRS.

(12) THESE NUTS SHALL BE USED IN ACCORDANCE WITH THE LIMITATIONS OF NASM3358B,

(13) NASM21042 SUPERSEDES: AN363, AN364, AN365, MS20364, MS20365, MS21040, NAS679 IN pART,NAS1O21 IN PART, NAS1O22 IN PART, NAS1291 IN PART.

(14) THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN.

(15) UNLESS OTHERWISE SPECIFIED, ISSUES OF R.EFERENCED DOCUMENTS ARE THOSE IN EFFECT ATTHE TIME OF SOLICITATION.

(16) UNLESS OTHERWISE SPECIFIED HEREIN, REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECTON DATE OF MANUFACTURE. HOWEVER, EXISTING MATERIAL INVENTORY CERTIFIED TO A PREVIOUSREVISION OF THE APPLICABLE MATERIAL SPECIFICATION(S) IS ACCEPTABLE FOR USE UNTILDEPLETION.

ILTI MARKING: MANUFACTURER'S IDENTIFICATION REQUIRED FOR SIZES .T640-32 AND LARGER. SIZES.1380-32 AND SMALLER AT MANUFACTURER'S OPTION (POSITION OPTIONAL).

@ corvrer-rrElY REVTsED NASM21042

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NATIONAL AEROSPACE STANDARD@ COPYRIGHT 2013 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC, ALL RIGHTIS RESERVED

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EdrUSE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SiUPPUERS OR CERTIFYCoNFoRMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. ALA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OFITEMS FOR ANY PARTICULAR APPLICAT]ON OR (2) THE EXISTENCE OF OR APPLIOqBTLITY THERE-TO OF PATENT OR TMDEIYARKS RIGHTS.

TABLE II - INTERCHANGEABILITY TABLECANCELLED AND INACTIVATED PART NUMBERS SUBSTITUTIVE

PART NUMBERSAN363 AN364 AN365 MS20364 MS20365 MS21040 NAS679 NAS 021 NAS1022 NAS129ix02 MS2r042-02-02 MSZLO42LO2

-440C -440C -04 x04w. x04 AX04 x04 ttts2t042-04104 A04 A04 -04 tv1s2r042L04

-448C NONE-632 -632C -632C -632C -6321 -06 XO6W, XO6 AXO6 AXO6 x06 M521042-06

-640C -640C NONE

106 A06 A06 A06 -06 MS21042106-832C -832C -832C -832C -832C -08 XOBW. XOB AXOB AXOS XOB M521042-08

108 AOB A08 A08 -08 MS21042108-836C -836C NONE

-7024 -t024c NONE-7032 -1032C -1032C -1032C -1032C -3 X3W, X3 AX3 AX3 X3 MS21042-3-420 -420C NONE

L3 A3 A3 A3 -3 MS2104213-428 -428C -428C -428C -428C -4 X4W. X4 AX4 AX4 x4 MS2t042-4

L4 A4 A4 A4 -4 MS2L042L4-518 -518C NONE-524 -524C -524C -524C -524C -5 X5 AX5 AX5 X5 M521042-5

L5 A5 A5 A5 -5 MS2104215-616 -616C NONE-624 -624C -624C -624C -624( -6 X6 AX6 AX6 X6 MS2L042-6

L6 A6 A6 A6 -6 M52104216-7 NAS679X7L7 NAS679A7

-720C -720C AX7 A7 SEE NASM21245-B20C -820C AXB AB SEE NASM21245-918C -918C AX9 A9 SEE NASM21245

-101BC -1018C AXlO 410 SEE NASM21245-t2t6c -L2L6C AX12 ALz SEE NASM21245.L4I4C -t4L4C AX14 A14 SEE NASM21245-1614C -1614C NAS1O22A17-1812C -1B12C AX18 A1B SEE NASM21245-20r2c -2072C AX2O A20 SEE NASM21245

@ couer-rrElY REVTsED

REVISION

1

|NASfrl21042SHEET 4