Threaded Insert Styles

MIL-STD-1758........Insert Screw Thread, Preferred for Design, Listing of (CANCELLED)
This may be cancelled but it is an excellent resource.
  1. Keenserts:

Keensert Boss and Cover to Housing Guidelines          
Figure of insert to boss/cover relationship
  Screw 
    Size
MS51830CAxx
 Insert Dash  No.
Socket Hd Cap Screw   Flat Washer  Insert  Hole Boss  Parts 
Dia Hd dia Hd hght Part
Number
Dia Thk Part
Number
O.D. Length Min full thd Lng 1/2 Dia Cover Chassis
A B max C max D max E F G max H J min K L M ref
2 -101 0.086 0.140 0.086 NAS1351
CxxLExx
0.164 0.016 NAS620
Cx
0.164 0.135 0.140 0.350 0.170 0.120 0.350
4 -102 0.112 0.183 0.112 0.224 0.032 0.190 0.185 0.160 0.400 0.190 0.150 0.400
6 -103 0.138 0.226 0.138 0.282 0.032 0.216 0.185 0.160 0.420 0.220 0.170 0.450
8 -104 0.164 0.270 0.164 0.319 0.032 0.250 0.235 0.210 0.480 0.250 0.190 0.500
10 -105 0.190 0.312 0.190 0.369 0.063 0.312 0.327 0.370 0.600 0.310 0.220 0.590
1/4 -106 0.250 0.375 0.250 NAS1352
Nxx-xx
0.483 0.063 NAS620
Cx
0.375 0.390 0.430 0.750 0.370 0.290 0.710
5/16 -107 0.312 0.469 0.312 0.582 0.063 AN960
C516
0.437 0.452 0.500 0.900 0.440 0.340 0.830
3/8 -108 0.375 0.562 0.375 0.645 0.063 AN960
C616
0.500 0.515 0.560 1.050 0.500 0.370 0.920
7/16 -109 0.437 0.656 0.437 0.770 0.063 AN960
C716
0.562 0.577 0.620 1.200 0.560 0.440 1.050
1/2 -110 0.500 0.750 0.500 0.895 0.063 AN960
C816
0.625 0.640 0.680 1.350 0.620 0.500 1.170
  1. T-Serts:

  1. Helicoils 

*inactive for new design


HELICOILS
UNF (1191)
UNC (1185)

AVAILABLE INSERT LENGTHS
SCREW
THD
INSERT  SCREW
THD
INSERT 
SIZE O.D. O.D.
(max)
HOLE DEPTH (bottom tap) SIZE O.D. O.D.
(max)
HOLE DEPTH (bottom tap)
1D
1.5D 2D 2.5D 3D 1D  1.5D  2D  2.5D  3D
1D  1.5D  2D  2.5D  3D








1-64
.073
.103
.136
.172
.209
.245
.282
.073
.110
.146
.183
.219
2-64 .086 .119 .149
.192
.235
.278
.321
2-56 .086 .119 .157 .200 .243 .286 .329 .086 .129 .172 .215 .258
3-56 .099 .146 .170
.220
.269
.319
.368
3-48 .099 .139 .182 .232 .281 .331 .380 .099 .148 .198 .247 .297
4-48 .112 .162 .195
.251
.307
.363
.419
4-40 .144 .159 .212 .268 .324 .380 .436 .112 .168 .224 .280 .336








5-40 .125 .173 .225 .288 .350 .412 .475 .125 .187 .250 .312 .375
6-40 .138 .193 .238
.307
.376
.445
.514
6-32 .138 .193 .263 .332 .401 .470 .539 .138 .207 .276 .345 .414
8-36 .164 .224 .275
.357
.439
.521
.603
8-32 .164 .220 .289 .371 .453 .535 .617 .164 .246 .328 .410 .492
10-32 .190 .256 .315
.410
.505
.600
.695
10-24 .190 .259 .357 .452 .547 .642 .737 .190 .285 .380 .475 .570








12-24* .216 .285 .383 .491 .599 .707 .815 .216 .324 .432 .540 .648
1/4-28
.250
.326
.393
.518
.643
.768
.893
1/4-20
.250
.330
.450
.575
.700
.825
.950
.250
.375
.500
.625
.648
5/16-24 .312 .400 .479
.635
.791
.947
1.103
5/16-18 .312 .400 .534 .690 .846 1.002 1.158 .312 .469 .625 .781 .937
3/8-24 .375 .468 .542
.729
.917
1.104
1.292
3/8-16 .375 .472 .625 .812 1.000 1.188 1.375 .375 .562 .750 .937 1.125
7/16-20 .438 .549 .638
.857
1.076
1.295
1.514
7/16-14 .438 .551 .724 .943 1.162 1.381 1.600 .438 .656 .875 1.094 1.312
1/2-20 .500 .617 .700
.950
1.200
1.450
1.700
1/2-13 .500 .622 .808 1.058 1.308 1.558 1.808 .500 .750 1.000 1.250 1.500
9/16-18 .562 .691 .784
1.065
1.346
1.627
1.908
9/16-12 .562 .694 .895 1.176 1.457 1.738 2.019 .562 .844 1.125 1.406 1.687
5/8-18 .625 .758 .847
1.160
1.472
1.785
2.097
5/8-11 .625 .767 .989 1.302 1.614 1.926 2.239 .625 .937 1.25 1.562 1.875
3/4-16 .750 0.901 1.000
1.375
1.750
2.125
2.500
3/4-10 .750 .906 1.150 1.525 1.900 2.275 2.650 .750 1.125 1.500 1.875 2.250
7/8-14 .875 1.051 1.161
1.598
2.036
2.473
2.911
7/8-9 .875 1.052 1.319 1.757 2.194 2.632 3.069 .875 1.312 1.750 2.187 2.625
1"-14 *
1.000
1.186
1.286 1.786 2.286 2.786 3.286







1.000
1.500
2.000
2.500
3.000
1”-12  1.000 1.199 1.333
1.833
2.333
2.833
3.333
1"-8 1.000 1.196 1.500 2.000 2.500 3.000 3.500 1.000 1.500 2.000 2.500 3.000
1”1/8-12  1.125 1.334 1.458
2.021
2.583
3.146
3.708
1”1/8-7
1.125 1.355 1.696 2.259 2.821 30384 3.946 1.125 1.687 2.250 2.812 3.375
1”1/4-12  1.250 1.469 1.583
2.208
2.833
3.458
4.083
1”1/4-7  1.250 1.483 1.821 2.446 3.071 3.696 4.321 1.250 1.875 2.500 30125 3.750
1”3/8-12  1.375 1.610 1.708
2.396
3.083
3.771
4.458
1”3/8-8
1.375 1.643 2.042 2.729 3.417 4.104 4.792 1.375 2.062 2.750 3.437 4.125
1”1/2-12  1.500 1.745 1.833
2.583
3.333
4.083
4.833
1”1/2-6  1.500 1.772 2.167 2.917 3.667 4.417 5.167 1.500 2.250 3.000 3.750
  1. Rivnuts