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MS21250

PROCUREMENT SPECIFICATION: MIL-B-8831
TITLE: BOLT,STEEL,EXTERNAL WRENCHING 180,000PSI FTU, 450°F, 12 POINT
CLASSIFICATION: STANDARD PART MS 21250

 

Dash
No.
Thread
MIL-S-8879
A
Diam
B
Diam
Nom
Size
W
D
Diam
E
Diam
H J
+.010
-.030
M N
Diam
±.005
P
Max
Q R S
Max
T
Min
U
±.016
02 .1640-
UNJC-3A
.300
.290
.1635
.1625
0.2188 .219
.204
0.076 0.25 0.10 .062 .037 0.05 .041
.031
0.385 .031
03 .1900-32
UNJF-3A
.350
.340
.1895
.1885
0.25 .250
.235
0.092 0.265 0.125 0.055 0.42
04 .2500-28
UNJF-3A
.438
.428
.2495
.2485
0.3125 .312
.297
0.135 0.30 0.18 0.069 0.492
05 .3125-24
UNJF-3A
.531
.521
.3120
.3110
0.375 .375
.360
0.162 0.348 0.215 .070 .055 0.082 0.579 .047
06 .3750-24
UNJF-3A
.649
.639
.3745
.3735
0.4375 .437
.422
0.197 0.388 0.26 0.091 .057
.047
0.625
07 4375-20
UNJF-3A
.750
.740
.4370
.4360
0.50 .500
.485
0.228 0.435 0.32 0.099 0.721
08 .5000-20
UNJF-3A
.828
.818
.4995
.4985
0.5625 .562
.547
0.254 0.504 0.38 .094 0.123 0.768
09 .5625-18
UNJF-3A
.938
.928
.5615
.5605
0.625 .625
.610
0.287 0.557 0.44 0.133 0.825 .062
10 .6250-18
UNJF-3A
1.050
1.040
.6240
.6230
0.6875 .687
.672
0.327 0.618 0.50 0.15 0.899
12 .7500-16
UNJF-3A
1.230
1.220
.7490
.7480
0.8125 .812
.797
0.38 0.711 0.57 .200 0.178 .073
.063
.187 1.036
14 .8750-14
UNJF-3A
1.438
1.428
.8740
.8730
0.9375 .937
.922
0.438 0.808 0.65 .125 .260 0.198 1.244 .078
16 1.000-12
UNJF-3A
1.625
1.615
.9990
.9980
1.0625 1.062
1.047
0.493 0.923 0.74 0.222 .250 1.479

 

GRIP MS 21250, LENGTH: ±.015
DIAMETER DASH NUMBER
DASH
No.
GRIP
±.010
2 3 4 5 6 7 8 9 10 12 14 15
4 .25 0.655 0.69 0.762 0.849 0.895 0.991 1.038
6 .375 0.78 0.815 0.887 0.974 1.02 1.116 1.163 1.247 1.294 1.431
8 .50 0.905 0.94 1.012 1.099 1.145 1.241 1.288 1.372 1.419 1.556 1.764 1.999
10 .625 1.03 1.065 1.137 1.224 1.27 1.366 1.413 1.497 1.544 1.681 1.889 2.124
12 .75 1.155 1.19 1.262 1.349 1.395 1.491 1.538 1.622 1.669 1.806 2.014 2.249
14 .875 1.28 1.315 1.387 1.474 1.52 1.616 1.663 1.747 1.794 1.931 2.139 2.374
16 1.00 1.405 1.44 1.512 1.599 1.645 1.741 1.788 1.872 1.919 2.056 2.264 2.499
18 1.125 1.53 1.565 1.637 1.724 1.77 1.866 1.913 1.997 2.044 2.181 2.389 2.624
20 1.25 1.655 1.69 1.762 1.849 1.895 1.991 2.038 2.122 2.169 2.306 2.514 2.749
22 1.375 1.78 1.815 1.887 1.974 2.02 2.116 2.163 2.247 2.294 2.431 2.639 2.874
24 1.50 1.905 1.94 2.012 2.099 2.145 2.241 2.288 2.372 2.419 2.556 2.764 2.999
26 1.625 2.03 2.065 2.137 2.224 2.27 2.366 2.413 2.497 2.544 2.681 2.889 3.124
28 1.75 2.155 2.19 2.262 2.349 2.395 2.491 2.538 2.622 2.669 2.806 3.014 3.249
30 1.875 2.28 2.315 2.387 2.474 2.52 2.616 2.663 2.747 2.794 2.931 3.139 3.374
32 2.00 2.405 2.44 2.512 2.599 2.645 2.741 2.788 2.872 2.919 3.056 3.264 3.499
34 2.125 2.53 2.565 2.637 2.724 2.77 2.866 2.913 2.997 3.044 3.181 3.389 3.624
35 2.188 2.833
36 2.25 2.655 2.69 2.762 2.849 2.895 2.991 3.038 3.122 3.169 3.306 3.514 3.749
38 2.375 2.78 2.815 2.887 2.974 3.02 3.116 3.163 3.247 3.294 3.431 3.639 3.874
39 2.438 3.225
40 2.50 2.905 2.94 3.012 3.099 3.145 3.241 3.288 3.372 3.419 3.556 3.764 3.999
42 2.625 3.03 3.065 3.137 3.224 3.27 3.366 3.413 3.497 3.544 3.681 3.889 4.124
44 2.75 3.155 3.19 3.262 3.349 3.395 3.491 3.538 3.622 3.669 3.806 4.014 4.249
46 2.875 3.28 3.315 3.387 3.474 3.52 3.616 3.663 3.747 3.794 3.931 4.139 4.374
48 3.00 3.405 3.44 3.512 3.599 3.645 3.741 3.788 3.872 3.919 4.056 4.264 4.499
50 3.125 3.53 3.565 3.637 3.724 3.77 3.866 3.913 3.997 4.044 4.181 4.389 4.624
52 3.25 3.655 3.69 3.762 3.849 3.895 3.991 4.038 4.122 4.169 4.306 4.514 4.749
54 3.375 3.78 3.815 3.887 3.974 4.02 4.116 4.163 4.247 4.294 4.431 4.639 4.874
56 3.50 3.905 3.94 4.012 4.099 4.145 4.241 4.288 4.372 4.419 4.556 4.764 4.999
58 3.625 4.03 4.065 4.137 4.224 4.27 4.366 4.413 4.497 4.544 4.681 4.889 5.124
60 3.75 4.155 4.19 4.262 4.349 4.395 4.491 4.538 4.622 4.669 4.806 5.014 5.249
62 3.875 4.28 4.315 4.387 4.474 4.52 4.616 4.663 4.747 4.794 4.931 5.139 5.374
64 4.00 4.405 4.44 4.512 4.599 4.645 4.741 4.788 4.872 4.919 5.056 5.264 5.499
66 4.125 4.53 4.565 4.637 4.724 4.77 4.866 4.913 4.997 5.044 5.181 5.389 5.624
68 4.25 4.655 4.69 4.762 4.849 4.895 4.991 5.038 5.122 5.169 5.306 5.514 5.749
70 4.375 4.78 4.815 4.887 4.974 5.02 5.116 5.163 5.247 5.294 5.431 5.639 5.874
72 4.50 4.905 4.94 5.012 5.099 5.145 5.241 5.288 5.372 5.419 5.556 5.764 5.999
74 4.625 5.03 5.065 5.137 5.224 5.27 5.366 5.413 5.497 5.544 5.681 5.889 6.124
76 4.75 5.155 5.19 5.262 5.349 5.395 5.491 5.538 5.622 5.669 5.806 6.014 6.249
78 4.875 5.28 5.315 5.387 5.474 5.52 5.616 5.663 5.747 5.794 5.931 6.139 6.374
80 5.00 5.405 5.44 5.512 5.599 5.645 5.741 5.788 5.872 5.919 6.056 6.264 6.499
82 5.125 5.53 5.565 5.637 5.724 5.77 5.866 5.913 5.997 6.044 6.181 6.389 6.624
84 5.25 5.655 5.69 5.762 5.849 5.895 5.991 6.038 6.122 6.169 6.306 6.514 6.749
86 5.375 5.78 5.815 5.887 5.974 6.02 6.116 6.163 6.247 6.294 6.431 6.639 6.874
88 5.50 5.905 5.94 6.012 6.099 6.145 6.241 6.288 6.372 6.419 6.556 6.764 6.999
90 5.625 6.03 6.065 6.137 6.224 6.27 6.366 6.413 6.497 6.544 6.681 6.889 7.124
92 5.75 6.155 6.19 6.262 6.349 6.395 6.491 6.538 6.622 6.669 6.806 7.014 7.249
94 5.875 6.28 6.315 6.387 6.474 6.52 6.616 6.663 6.747 6.794 6.931 7.139 7.374
96 6.00 6.405 6.44 6.512 6.599 6.645 6.741 6.788 6.872 6.919 7.056 7.264 7.499

GRIP LENGTH OF BOLTS SHALL BE MEASURED FROM UNDERSIDE OF HEAD TO THE END OF FULL CYLINDRICAL PORTION OF THE SHANK.

DASH NO. INDICATED PREFERRED LENGTHS IN 0.125″ INCREMENTS. INTERMEDIATE OR LONGER LENGTHS IN 0.062″ INCREMENTS MAY BE OBTAINED BY SPECIFIYING SIGNIFICANT DASH NUMBERS. LENGTH AND GRIP OF A BOLT WITH AN ODD DASH NUMBER WILL BE 0.061″ GREATER THAN SHOWN FOR THE BOLT WITH THE PRECEDING EVEN SECOND DASH NUMBER.

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