NOMINAL
THREAD		 COUNTERSINK  MINIMUM TAPPING DEPTH
“M” DIA. PITCH DIAMETER INSERT LENGTH MINOR  DIA. TOP MAJ. THREAD
MIN MAX MIN 3B MAX 2B MAX 1D 1-1/2D 2D 2-1/2D 3D MIN MAX DIA. MAX PITCH P
UNIFIED
COARSE
1
(.073)-64		 .085 .10 .0832 .0843 .0850 .090 .125 .160 .200 .235 .0764 .0823 .0958 .01563
2.(.086)-56 .09 .11 .0976 .0989 .0996 .100 .150 .190 .230 .280 .0899 .0961 .1117 .01786
3
(.099)-48		 .11 .14 .1126 .1140 .1148 .120 .170 .220 .270 .320 .1036 .1104 .1289 .02083
4
(.112)-40		 .14 .17 .1283 .1299 .1308 .140 .190 .250 .310 .360 .1175 .1252 .1473 .02500
5
(.125)-40		 .16 .19 .1413 .1430 .1438 .150 .210 .280 .340 .400 .1305 .1373 .1603 .02500
6
(.138)-32		 .18 .21 .1583 .1601 .1611 .170 .240 .310 .380 .450 .1448 .1527 .1817 .03125
8
(.164)-32		 .20 .23 .1843 .1862 .1872 .200 .280 .360 .440 .520 .1708 .1781 .2077 .03125
10
(.190)-24		 .24 .27 .2170 .2192 .2203 .230 .330 .420 .520 .610 .1990 .2080 .2475 .04167
12
(.216)-24		 .26 .29 .2430 .2453 .2464 .260 .370 .470 .580 .690 .2250 .2340 .2735 .04167
1/4
(.2500)-20		 .31 .34 .2825 .2851 .2864 .300 .430 .550 .680 .800 .2608 .2704 .3187 .05000
5/16
(.3125)-18		 .38 .41 .3486 .3515 .3529 .370 .530 .680 .840 .990 .3245 .3342 .3884 .05556
3/8
(.3750)-16		 .45 .48 .4156 .4189 .4203 .440 .630 .810 1.000 1.190 .3885 .3987 .4602 .06250
7/16
(.4375)-14		 .52 .55 .4839 .4875 .4890 .510 .730 .950 1.170 1.380 .4530 .4639 .5343 .07143
1/2
(.5000)-13		 .59 .62 .5499 .5537 .5554 .580 .830 1.080 1.330 1.580 .5166 .5273 .6042 .07692
9/16
(.5625)-12		 .66 .69 .6167 .6208 .6225 .650 .930 1.210 1.490 1.770 .5806 .5918 .6751 .08333
5/8
(.65250)-11		 .73 .76 .6841 .6885 .6903 .720 1.030 1.340 1.650 1.970 .6447 .6564 .7477 .09091
3/4
(.7500)-10		 .87 .90 .8149 .8196 .8216 .850 1.230 1.600 1.980 2.350 .7716 .7838 .8850 .10000
7/8
(.8750)-9		 1.00 1.03 .9471 .9522 .9543 .990 1.420 1.860 2.300 2.740 .8990 .9119 1.0247 .11111
1
(1.000)-8		 1.14 1.17 1.0812 1.0868 1.0890 1.130 1.630 2.130 2.630 3.130 1.0271 1.0421 1.1681 .12500
1-1/8
(1.1250)-7		 1.29 1.32 1.2178 1.2239 1.2262 1.270 1.830 2.390 2.960 3.520 1.1559 1.1730 1.3171 .14286
1-1/4
(1.2500)-7		 1.41 1.44 1.3428 1.3490 1.3514 1.390 2.020 2.640 3.270 3.890 1.2809 1.2980 1.4421 .14286
1-3/8
(1.3750)-6		 1.56 1.59 1.4832 1.4900 1.4926 1.540 2.230 2.920 3.600 4.290 1.4110 1.4310 1.5982 .16667
1-1/2
(1.5000)-6		 1.69 1.72 1.6082 1.6151 1.6177 1.670 2.420 3.170 3.920 4.670 1.5360 1.5560 1.7232 .16667
UNIFIED
FINE
2
(.086)-64		 .09 .11 .0962 .0974 .0981 .100 .145 .190 .230 .275 .0894 .0947 .1088 .01563
3
(.099)-56		 .11 .14 .1106 .1119 .1126 .120 .170 .220 .270 .310 .1029 .1086 .1247 .01786
4
(.112)-48		 .14 .17 .1256 .1271 .1279 .130 .190 .240 .300 .360 .1166 .1229 .1419 .02083
6
(.138)-40		 .17 .20 .1543 .1560 .1569 .160 .230 .300 .370 .440 .1435 .1503 .1733 .02500
8
(.164)-36		 .20 .23 .1821 .1840 .1849 .190 .270 .360 .440 .520 .1701 .1771 .2032 .02778
10
(.190)-32		 .23 .26 .2103 .2123 .2133 .220 .320 .410 .510 .600 .1968 .2041 .2337 .03125
1/4
(.2500)-28		 .29 .32 .2732 .2754 .2765 .290 .410 .540 .660 .790 .2577 .2646 .2995 .03571
5/16
(.3125)-24		 .36 .39 .3395 .3421 .3433 .350 .510 .670 .820 .980 .3215 .3288 .3700 .04167
3/8
(.3750)-24		 .42 .45 .4020 .4047 .4059 .420 .600 .790 .980 1.170 .3840 .3910 .4325 .04167
7/16
(.4375)-20		 .50 .53 .4700 .4731 .4744 .490 .710 .930 1.140 1.360 .4483 .4561 .5062 .05000
1/2
(.5000)-20		 .56 .59 .5325 .5357 .5371 .550 .800 1.050 1.300 1.550 .5108 .5186 .5687 .05000
9/16
(.5625)-18		 .63 .66 .5986 .6020 .6035 .620 .900 1.180 1.460 1.740 .5745 .5826 .6384 .05556
5/8
(.6250)-18		 .69 .72 .6611 .6646 .6661 .680 .990 1.310 1.620 1.930 .6370 .6451 .7009 .05556
3/4
(.7500)-16		 .82 .85 .7906 .7945 .7961 .810 1.190 1.560 1.940 2.310 .7635 .7720 .8352 .06250
7/8
(.8750)-14		 .96 .99 .9214 .9257 .9274 .950 1.380 1.820 2.260 2.700 .8905 .8994 .9718 .07143
1
(1.000)-14		 1.08 1.11 1.0464 1.0508 1.0527 1.070 1.570 2.070 2.570 3.070 1.0155 1.0243 1.0968 .07143
1
(1.000)-12		 1.10 1.13 1.0542 1.0589 1.0608 1.080 1.580 2.080 2.580 3.080 1.0181 1.0281 1.1126 .08333
1-1/8
(1.1250)-12		 1.22 1.25 1.1792 1.1841 1.1860 1.210 1.770 2.330 2.900 3.460 1.1431 1.1531 1.2376 .08333
1-1/4
(1.2500)-12		 1.35 1.38 1.3042 1.3092 1.3112 1.330 1.960 2.580 3.210 3.830 1.2681 1.2781 1.3626 .08333
1-3/8
(1.3750)-12		 1.47 1.50 1.4292 1.4343 1.4364 1.460 2.150 2.830 3.520 4.210 1.3931 1.4031 1.4876 .08333
1-1/2
(1.5000)-12		 1.60 1.63 1.5542 1.5595 1.5615 1.580 2.330 3.080 3.830 4.580 1.5181 1.5281 1.6126 .08333