Reproduced By IHS
\/\rith The Permission Of AIA/NAS
Under Royalty Agreement
NATIONAL AEROSPACE STAN DARD
@ COPYRIGHT 2011 AEROSPACE INDUSTRIES ASSOCIATIOI{ OF AMERICA, INC. ALL RIGHTS RESERVED
FED.SUPPLY CLASS
5310
COUNTERSINK, COUNTERBORE, OR MDIUS
RELIEF TO THREAD WITHiN THE UMITS OF
DIMENSION'OD'' AND 88O MIN ANGLE.
=
<.
MARK MANUFACTURER'S
8
U
ID. POSITION OPTIONAL.
z
z
tr
s
g:R
88O MIN
Q@<
z2>
EBe
<iH
i*5s
9o?
E6E
COPPER BASE ALLOY NUTS
SHALL BE STAMPED WITH
LETTER ''B" ON TOP OR
HEX FLAT, FOR IDENTIFICANON.
CONFIGURATION OF NUT OPTIONAL.
UMITAT]ONS IMPOSED ONLY ON
DIMENSIONS AND REOUIREMENTS
SPECIFIED HEREIN.
(2)COMPLETELYREVISED
TABLE
DASH NUMBERS
NON-METALLIC INSERT
ALUM
STEEL COPPER
CRES
ALLOY
BASE
ALLOY
U<
OI
F=
FO
oI
22
;Y
S=
o@
oz
d<
<I
OF
Zd
str
@g
zd
tsz
U5
Ptr
2P,
<[
<U
6Z
ep
OE
d)
;i
=oF
<Fz
==6
i9a
c02
D02
D04
D06
D08
N02
N04
N06
N08
802
804
806
808
D3
N3
B3
c04
c06
c08
c3
D4
D5
D6
D7
D8
D9
D10
N4
84
C4
N5
B5
N6
N7
N8
N9
N10
N12
N14
N16
N18
N20
N22
N24
B6
c5
c6
87
C7
B8
c8
B9
C9
810
BT2
c10
B14
B16
ct4
Dt2
DT4
D16
D18
D20
D22
D24
818
820
ct2
c16
c18
B.22
c20
c22
B.24
c24
I_
T
THREAD
AS8879
DIMENSIONS
A
MAX
UNJF-38
UNIF-38
UNIF-38
UNJF-3B
.5000-20 UNJF-3B
F
BEARING
MIN
SURFACE
MAX
125
.268
.268
14I
110
.r57
.219
.266
.188
.235
.305
.336
.367
.430
.339
.188
.313
.345
.282
.251
.376
.439
SQUARE-
-.010
MIN
.243
.243
1380-32 UNJC-38
.2500-28
.3125-24
.3750-24
.4375-20
QD
+.020
.25r
.25r
r25
.1900-32 UNJF-3B
C
MIN
.094
.094
.0860-56 UNIC-3B
.TI2O-40 UNJC-38
t640-32 UNJC-38
MIN
B
t9l
.374
.410
.482
.131
.131
156
183
.210
.502
.564
.690
.492
.552
.553
.679
.622
.766
.273
.336
.398
.458
.752
.741
.837
.531
NESS
N
t8/
^i
N
U
E
U
,031
.031
.004
.047
z
.006
062
.aa7
.094
.008
.328
.298
.3M
.877
.865
.978
.594
125
"376
.940
.928 1.051
.656
.787
.156
.010
UNJF-38
.375
.407
.422
UNIF-3B
.485
.172
.203
,011
1.0000-12 UNJF-38
.578
r.t250-t2
r.2500-t2
.672
.562s-18
.6250-18
.7500-16
.8750-14
UNIF-3B
UNIF-38
UNJF-38
UNJF-38
T.3750.12 UNJF-38
1.5000-12 UNrF-3B
.766
.828
1.064 1.052 1. 191
.454 L.252 1.239 1.403
516 t.440 1.427 1,615
.610 L.627 L.6L4 1.826
.703 1.815 1.801 2.038
2.008 I.973 2.249
.766
2.197 2.159 2.416
.391
,913
1.039
109
U
F
z
rt
U
.009
o
.0t2
d
U
1.166
1.290
.250
.313
.328
.013
zu
0L4
U
r.447
.281
1.568
.328
015
.016
(J
ii
k
u
THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MS21OB3, REVISION H. PART NUMBERS REMAIN MS21083.
PROCUREMENT
CUSTODIAN
REVISION
NATIONAL AEROSPACE STANDARDS COMMITTEE
2
TITLE
SPECIRCATION
NASM25027
NUT, SELF-LOCKTNG, HEXAGON,
NON-METALLTC TNSERT, LOW HETGHT, 250 oF
o
CLASSIFICATION
PART STANDARD
NASM21083
SHEET 1 OF 5
UsE OF OR REUANCE UPON THIS DOCUMEMT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUAUFY SUPPUERS OR CERTIFY
AIAMAKESNOREPRESENTATIONORCLAIMRESPECNNG(1)THESUITABIUTYOF
CONFORMANCEOFITEMSPRODUCEDUNDERNAT]ONALAEROSPACESTANDARDS.
ITEMS FOR ANY PARTICULAR APPUCATION OR (2) THE EXISTENCE OF OR APPLICABIUTY THERETO OF PATEI.IT OR TMDEI'1ARKs RIGHTS.
f
th
o
ffi
@copyRrc'r2o,,l:l*Illi:::'"^i*:,:*xlll***,,,"u,o
ffi
MATERIAL:
STEEL:
=
a
5
z
T
k
q
121s (UNS G121s0) PER AMS5O10.
.:
d
3;s
Qd<
CRES:
zZ>
l,.i
1006 (UNS G10060) PER ASTM A29|A29M, ASTM 4510 ORASTM 4853.
1008 (uNS G10080) pER ASTM A29|A29M, ASTM A510 OR ASTM A853.
1009 (uNS G10090) PER SAE J118.
1010 (uNS G10100) pER AMS5040, ASTM M9|A29M, ASTM 4510 OR ASTM 4853.
1018 (UNS G10180) pER AMS5069, ASTM p2glA29M, ASTM 4510 OR ASTM A853.
1035 (UNS G10350) pER AMS5080, ASTM p2glA29M, ASTM 4510 OR ASTM A853.
1137 (UNS G11370) PER AMS5024 OR ASTM A29/A29tv1.
11137 (UNS GLL374) pER AMss€2O OR ASTM A29/A29M.
1213 (UNS G12130) pER SAE J403 OR ASTM A29|A29M.
12114 (UNS Gt2L44) pER SAE J403 OR ASTM 4108.
6<
x=x
v3=
a:a
ALUMINUM ALLOY:
302 (UNS 530200) PER AMS5688, AMS5636, AMS5637, OR AMS-QQ-S-763.
303 (UNS 530300) pER AMS5640, ASTM A581, OR ASTM A582.
304 (UNS 530400) pER AMS5647, AMS5639 OR AMS-QQ-S-763
304HN (UNS 530452) pER ASTM A276, OR AMS-QQ-S-763.
3041 (UNS 530430) pER ASTM A493, AMS5647 OR AMS-QQ-S-763.
20M-r6
(UNS A92014) PER AMS-QQ-A-20012, AMS-QQ-A-225/4, OR AMS4121.
2077 T4 (UNS A92017) pER AMS-QQ-A-22sls OR AMS4118.
2024-T6 OR T4 (UNS A92024) pER AMS-QQ-A-225/6 OR AMS4120.
707s-T6 OR T651 (UNS A97075) pER AMS-QQ-A-200/11, AMS-QQ-A-225/9, OR
AM54123.
BMSS:
CA 360 (UNS C36000), 1/2 HARD.
cA 260 (UNS C26000) PER ASTM 836/836M,
ASTM 816/816M.
A$FI4*F+,
,ASTF4,A829, AMS4610 OR
NON-METALUC INSERT: NYLON PER ASTM D4066, GROUP 1, CLASS 1 OR 2.
F
U<
<U
OI
UF
FO
ed
FINISH:
STEEL AND COPPER BASE ALLOY NUTS: CADMIUM PLATED IN ACCORDANCE WTTH AMS-QQ-P.416,
TYPE II, CLASS 2.
CRES NUTS: PASSIVATE IN ACCORDANCE WITH AMS27OO, METHOD 1, CLASS 4.
;c
Sx
ALUMINUM ALLOY NUTS: ANODIZE OR CHEMICALLY SURFACE TREAT IN ACCORDANCE WITH
PROCUREM ENT SPECIFICATION.
ALUMINUM ALLOY NUTS: IN SIZES .0860-56 THRU .1900-32 DYED BLUE PER PROCUREMENT
SPECIFICATION.
oo
az
d<
<I
OF
Zi
3[
rF
:'1
z6
u^>
9Jtr
i'l
LUBRICATION:
<L=
{u
o:
o;
LUBRICANT APPROVED IN ACCORDANCE WITH NASM25O27; LUBRICANTS SHALL BE SOLUBLE IN THE
CLEANER SPECIFIED IN THE PROCUREMENT SPECIFICATION.
HF
YOF
=z<
B<o
<ts2
*q9
96;
rd!
REVISION
2
o
td
ir
@
cor'r nr-rrELY REVISED
NASM21083
SHEET 2
USE OF OR REI]ANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS EMNRELY VOLUNTARY. AIA DOES NOT QUAUFY SUPPUERS OR CERTIFY
CONFORMANCE OF ITET4S PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENIATION OR CLAIM RESPECNNG (1) THE SUITABIUTY OF
ITEMS FOR ANY PARTICULAR APPUCANON OR (2) THE EXISTENCE OF OR APPUCABIUTY THERETO OF PATENT OR TRADEMARIG RIGHTS.
NATIONAL AEROSPACE STANDARD
O COPYRIGHT 2011 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA" I]{C, ALL RIGHTS RESERVED
CODE:
THE PART NUMBER SHALL CONSIST OF THE BASIC PART NUMBER FOLLOWED BY A DASH NUMBER FROM
TABLE I.
=
d
:
EXAMPLES OF PART NUMBERS:
z
MS21083N4 = .2500-28 STEEL NUT, NON-METALUC INSERT, CADMIUM PLATED.
MS2108384 = .2500-28
tr
o
o
COPPER BASE ALLOY NUT, NON-METALUC INSERT, CADMIUM PLATED.
MS21083C4 = .2500-28 CRES NUT, NON-METALLIC INSERT, PASSIVATED.
MS21083D4 = .2500-28 ALUMINUM ALLOY NUT, NON-METALLIC INSERT, ANODIZED OR CHEMICAL
CONVERSION COATING.
g:R
oo<
Zz>
u-^z
Y=y
NOTES:
*=b
7Z
YQr
Ets;
(1)
(2)
(3)
ts
U<
st
Uts
I:
FO
oL
z<
;Y
5x
oo
oz
<=
OF
Ze
str
og
zd
u>
REMOVE ALL BURRS AND SHARP EDGES.
DIMENSIONS IN INCHES AND APPLY AFTER FINISH AND PRIOR TO THE APPLICATION OF LUBRICATION
UNLESS OTHERWISE SPECIFIED.
DESIGN AND USAGE LIMTTATIONS:
THESE NUTS ARE INTENDED FOR SHEAR APPLICATIONS.
THE STEEL NUTS ARE DESIGNED TO DEVELOP AN ULTIMATE TENSILE STRESS (Ftu) OF 70 KSI.
THE ALUMINUM NUTS ARE DESIGNED TO DEVELOP AN ULTIMATE TENSILE STRESS (Ftu) OF 70
KSI FOR SIZES "04" THRU "3" AND 35 KSI FOR SIZES "4" AND LARGER.
THE CRES NUTS ARE DESIGNED TO DEVELOP AN ULTIMATE TENSILE STRESS (Ftu) OF 70 KSI
FOR SIZES "04" THRU '8" AND 58 KSI FOR SIZES "9" AND LARGER.
THE COPPER BASE ALLOY NUTS HAVE NO AXIAL STRENGTH REQUIREMENTS.
THESE ULTIMATE TENSILE STRESS REQUIREMENTS ARE BASED UPON THE CROSS SECilONAL
AREA AT THE MINIMUM MINOR DIAMETER OF AS8879 EXTERNAL THREADS, AND WILL
BE OBTAINED WHEN THE NUTS ARE TESTED ON BOLTS HAVING A MINIMUM
ULTIMATE TENSILE STRENGTH 160 KSI. THESE NUTS ARE DESIGNED TO BE USED ON
3A EXTERNAL THREADS.
THESE NUTS SHALL BE USED IN ACCORDANCE WITH THE UMITATIONS OF NASM33588.
(4)
THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN.
(5)
UNLESS OTHERMSE SPECIFIED HEREIN, REFERENCED DOCUMENTS SHALL BE THE ISSUE
IN
EFFECT ON
DATE OF MANUFACTURE. HOWEVER, EXISTING MATERIAL INVENTORY CERTIFIED TO A PREVIOUS
REVISION OF THE APPLICABLE MATERIAL SPECIFICATiON(S) IS ACCEPTABLE FOR USE UNTIL
DEPLETION.
U>
Ptr
<[
=P,
(6)
aPF2s€?7.
]U
oE
ox
(7)
bs
ilJ
=<
=2<
<Fz
=<o
^-Y
-o>
Tdu
Fdd
UNLESS OTHERWISE SPECIFIED, PART INVENTORY MANUFACTURED TO PREVIOUS REVISIONS OF THE
APPLICABLE DMWING OR SPECIFICATION MAY BE PROCURED AND USED UNTIL STOCK IS DEPLETED.
18/
BEARING SURFACE SHALL BE SQUARE WITH PITCH DIAMETER WITHIN "X" WHEN MEASURED IN
ACCORDANCE WITH NASM25O27.
I9I
DIMENSION ACROSS FLATS INCLUDE DEFORMATION OF SELF-LOCKING DEVICE.
REVISION
2
E
d
if
@
counr-rrElY
REVTsED
NASM21083
5HETI J
THIS DOCUMENT OR ANY NATIONALAEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUAUFY SUPPUERS OR CERTIFY
CONFORMANCEOFITEMSPRODUCEDUNDERNATIONALAEROSPACESIANDAROS,
AIAMAKESNOREPRESENIATIONORCLAIMRESPECNNG(1)THESUIIABIUTYOF
ITEI.4S FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPUCABIUTY THERETO OF PATENT OR TRADEMARKS RIGHTS.
USE OF OR RELIANCE UPON
(10)
(11)
U
FOR CRES NUTS, MAGNETIC PERMEABILITY SHALL BE LESS THAN 2.0 (AIR = 1.0) FOR A FIELD
STRENGTH H = 200 OERSTEDS USING A MAGNETIC PERMEABIUTY INDICATOR PERASTM A3421A342M,
TEST METHOD 3.
MINIMUM VIEMTION LIFE REQUIREMENT SHALL BE THREE TIMES AVEMGE VIBMTION UFE LISTED IN
NASM25O27.
=
a
t
(r2)
SURFACE TEXTURE SHALL
z
(13)
DIMENSIONING AND TOLEMNCING pER ANSI y14.5M-1982.
Nor
EXCEED 125 MICROINCHES Ra pER ASME 846.1.
s
I
6
!t>i.i
Q6<
uiz
TABLE
?:e
*Ei.e
T
H_z
THREAD
<i<
,0860-56 UNJC-3B
.1120-40 UNJC-38
.1380-32 UNJC-38
230
.t640-32 UNJC-38
840
1,230
.1900-32 UNIF-38
.2500-28 UNJF-38
F
fiE
uF
FO
oL
@F
<F
rtr,
oS
530
840
t.20
r.20
2.60
2.60
4.50
4.50
5.10
6.80
10.40
18.00
25.00
36.00
43.00
55.00
5.10
6.80
10.40
18.00
25.00
36.00
43.00
55.00
13.280
16.880
88.500
106.800
13
.13
.25
2.60
2.60
4.50
5.10
6.80
10.40
18.00
25.00
36.00
43.00
55.00
10.440
1.3750-12 UNJF-38
1.5000-12 UNJF-38
.13
.13
.25
.40
5.680
.5000-20 UNJF-38
1.2500-12 UNJF-3B
.13
.13
.25
.40
.46
.66
1.05
BRASS
7.680
7.400
9.380
11,940
.5625-18 UNJF-38
6250-18 UNJF-38
.7500-16 UNiF-38
.8750-14 UNJF-38
33.800
840
1.230
AL
ALLOY
2,840
.3750-24 UNJF-3B
.4375-20 UNJF-3B
43,900
57,200
72.000
350
530
STEEL
3,840
r.t45
24.680
230
WEIGHT
LBS/1OO (REF)
.40
.46
.66
1.05
1.20
2.60
2.60
r.230
1.845
L1250-12 UNJF-38
oz
d<
230
350
3,690
5,680
7.680
1.0000-12 UNJF-38
e2
9v
$x
Oo
350
530
2,290
.3t25-24 UNJF-38
U<
II _ PERFORMANCE CHAMCTERISTIG
TENSILE STRENGTH
LBF MIN
STEEL
ALUM
CRES
ALLOY
5,220
6,640
8,440
12,340
16.900
21.950
28.600
36,000
44.250
53.400
2.290
3.690
L7,5t0
23,950
31.500
40.850
51.780
63.490
76,300
.46
.66
1.05
xz
=.o
Es
Ptr
<[
=t?
<U
oE
HH
=<
=oF
<FZ
<!20
=23
:o>
rd!
REVISION
:
P
2
@
coNrlrrElY
REVTsED
NASM21083
SHEET 4
usE oF oR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUAUFY SUPPUERS OR CERTIFY
coNFoRMANcE oF ITEMS PRoDUCED UNDER NATIoNAL AERospAcE STANDARDS. AIA MAKES No REPRESENTATIoN oR CLAIM nrselcnruc
1ry rnE suITABIury oF
NEMS FOR ANY PARTICUI.AR APPUCAT]ON OR (2) THE EXISTENCE OF OR APPUCABIUTY THERETO OF PATENT OR TMDEMARKS RIGHTS.
ffi,
NATIONAL AEROSPACE STANDARD
O COPYRIGHT 2011 AEROSPACE II{DUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED
NAIIOf{AI Af BOSTACE STANOA8OS
INTERCHANGEABILITY
INTERCHANGEABIUTY RELATIONSHIP: MS21083 NUTS CAN UNIVERSALLY REPLACE AN364, MS20364, AND NAS1022 NUTS
OF LIKE MATERI,AL, PLATING,.THREAD SIZE AND LOCKING DESIGN (ALL-METAL OR WITH NON-METALUC INSERT), BUT
THESE AN364, MS2O364 AND NAS1O22 NUTS CANNOT UNIVERSALLY REPLACE THE MS21O83 NUTS.
TABLE
a
:
AN3ff
z
III -
INTERCHANGEABILITY
CANCELLED AND INACNVE PART NUMBERS
MS20364
-632
-632
-632A
D632A
N06
B06
D06
-832A
N08
tr
U
D632
o
D632C
-ffio
-832
qgii
D832
8836
=z>
lrtr=
-=Y
*=ir
a_z
;Yf
EEE
D1024C
81032
81032C
D1032C
D1032
8428
- 1032
DIUJIA
81032
D1032A
D1032
8428C
D428C
B3
E3
D3
H3
-428A
N4
MS21OB3N3
MS21O83B3
M521OB3D3
MS21O83N4
8428
Br''z8c
M2BA
84
E4
MS2108384
D428
D428C
D428A
H4
MS21083ry+
-5244
-524
D4
N5
8524A
8524
D524
B5
E5
H5
-524A
8524C
8524A
D524A
MS21083N5
-624
-624A
8624C
8624A
B6
E6
MS210B386
D62E
D624C
D624A
D624
D624C
D624A
D6
N7
H6
MS21083D6
M521083N7
M52108387
MS21083D7
MS21083N8
M52108388
D524C
-720A
-720
8720C
8720A
8720
8720C
87204
87
E7
D720
D720C
820C
D720A
D720
D720C
D720A
H7
-820A
-820
_B2OA
882OA
D82OA
8820
D820
820C
8820C
DB2OC
D82OA
-918A
-918
D7
N8
B8
D8
N9
8918A
D918A
81018C
B1O1BA
D1018C
D1O1BA
8918
D918
- 1018
81018
D1018
- 12164
-12t6
81215
D1216
8918C
D918C
-
1018A
B1216
81216C
B1216A
D1216
D1216C
D1215A
_T4T4A
-14L4
=.o
8I414
81414C
B1414A
D14t4
D1414C
D1414A
81414
DT414
-720A
BB2OA
-918A
891BA
B9
E9
H9
-1018C
-1018A
D9
N10
M52108389
MS21083D9
M521083N10
81018C
D1018C
81018A
D1018A
810
E10
M521OB3B1O
D10
N12
H10
MS21083D10
M521083N1
MS21083B12
M521083D12
M521083N14
MS21083814
-t2L6A
81216C
D1216C
-r4t4
Bt4l4C
Dt4t4C
BL2
Et2
HL2
-1414A
D12
N14
B74L4A
D14144
BL4
Et4
D14
H14
812164
D1216A
1614A
-t6I4
-1614A
81614
D1614
81614A
D1614A
81614
D1614
81614A
D1614A
-1614(
-16.141
81514C
81614C
D1614C
D1614C
1812
-
<lz
81812
D1812
-zul
B2OL2
B20rz9
D2012
D20t2C
1812A
NAS1022817
NASiO22Dl7
NAS1022A17
NAS1022E17
NAS1022H17
M521083N18
-1812A
N18
81812
81812C
81812A
818
E1B
D1812
D1B12C
D1B12A
H18
MS21083B1B
M521OB3D1B
-)o1)A
-20t2
D18
N20
82012A
D2012A
B2O12
B20t2C
820
D2072
D2012C
82012A
D20124
E20
H20
MS21083N20
MS21083820
M521083D20
-
1812
MS21OB3D14
NAS1022N17
81812A
D1812A
81812C
D1812C
MS21OB3D8
MS21OB3N9
D918A
-
YOF
E8
HB
8918C
D918C
- 1514
iJ
MS210B3Bs
MS21OB3D5
MS21083N6
8720
-t2L6
Tdu
N3
81032A
D1032A
8624
8918
D918
- 1018
B1018
D1018
Y.i
- 1 0??a
8428A
D524A
-918
=e3
81032C
D1032C
Dz+28A
og
,^
ro>o
MS21O83DOB
8624A
8820C
{u
@Z
HOB
-6244
D820C
2P,
<ir
DOB
8524C
B820
U>
Ptr
M521083808
D832A
-6)4
tx24
D820
str
EOB
D5
N6
F
oz
d<
<I
OF
Zd
M521O83NOB
BOB
8524C
D524C
U<
>2
Sx
=i
Oo
MS21083N06
MS21083806
MS21083D06
8524
D524
-820
UF
FE
FO
D832C
-428
-428A
-720
6H
D832
D632C
E06
H06
D1024A
-524
:J
-832
- 1 n?74
-428
D428
D632
-6404
-832A
DB32A
BB36A
DB32C
DB36C
D1,024
- 1032
D632A
SUBSTITUTE
PART NUMBERS
NAS to22
-20r2A
D20
REVISION
2
:
d
@
coNer-rrElY
REVISED
NASM21083
SHEET 5
USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPUERS OR CERT1FY
AIAMAKESNOREPRESENTATIONORCLAII"IRESPECNNG(1)THESUITABIUTYOF
CONFORi4ANCEOFITEMSPRODUCEDUNDERMTIONALAEROSPACESTANDARDS.
ITEMS FOR ANY PARTICUTAR APPLICANON OR (2) THE EXISTENCE OF OR APPUCAEIUTY THERETO OF PATENT OR TMDEMARKS RIGHTS.