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Standard Pitch Diameter Chart

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Thread Plug Gages

NOMINAL SIZE GO BASIC
ALL CLASSES
ALL SERIES		 UNIFIED PITCH DIAMETERS
NOT GO X TOL.
GO =+
NO GO
=–		 X
LEAD
TOL.		 X ±
HALF
ANGLE
TOL.
CL. 2B CL. 3B
#0 - 80 UNF .0519 .0542 .0536 .0002 .0002 0°30'
#1 - 64 UNC .0629 .0655 .0648 .0002 .0002 0°30'
#1 - 72 UNF .0640 .0665 .0659 .0002 .0002 0°30'
#2 - 56 UNC .0744 .0772 .0765 .0002 .0002 0°30'
#2 - 64 UNF .0759 .0786 .0779 .0002 .0002 0°30'
#3 - 48 UNC .0855 .0885 .0877 .0002 .0002 0°30'
#3 - 56 UNF .0874 .0902 .0895 .0002 .0002 0°30'
#4 - 40 UNC .0958 .0991 .0982 .0002 .0002 0°20'
#4 - 48 UNF .0985 .1016 .1008 .0002 .0002 0°30'
#5 - 40 UNC .1088 .1121 .1113 .0002 .0002 0°20'
#5 - 44 UNF .1102 .1134 .1126 .0002 .0002 0°20'
#6 - 32 UNC .1177 .1214 .1204 .0003 .0003 0°15'
#6 - 40 UNF .1218 .1252 .1243 .0002 .0002 0°20'
#8 - 32 UNC .1437 .1475 .1465 .0003 .0003 0°15'
#8 - 36 UNF .1460 .1496 .1487 .0002 .0002 0°20'
#10 - 24 UNC .1629 .1672 .1661 .0003 .0003 0°15'
#10 - 32 UNF .1697 .1736 .1726 .0003 .0003 0°15'
#12 - 24 UNC .1889 .1933 .1922 .0003 .0003 0°15'
#12 - 28 UNF .1928 .1970 .1959 .0003 .0003 0°15'
#12 - 32 UNEF .1957 .1998 .1988 .0003 .0003 0°15'
1/4 - 20 UNC .2175 .2224 .2211 .0003 .0003 0°15'
1/4 - 28 UNF .2268 .2311 .2300 .0003 .0003 0°15'
1/4 - 32 UNEF .2297 .2339 .2328 .0003 .0003 0°15'
5/16 -18 UNC .2764 .2817 .2803 .0003 .0003 0°10'
5/16 - 24 UNF .2854 .2902 .2890 .0003 .0003 0°15'
5/16 - 32 UNEF .2922 .2964 .2953 .0003 .0003 0°15'
3/8 - 16 UNC .3344 .3401 .3387 .0003 .0003 0°10'
3/8 - 24 UNF .3479 .3528 .3516 .0003 .0003 0°15'
3/8 - 32 UNEF .3547 .3591 .3580 .0003 .0003 0°15'
7/16 - 14 UNC .3911 .3972 .3957 .0003 .0003 0°10'
7/16 - 20 UNF .4050 .4104 .4091 .0003 .0003 0°15'
7/16 - 28 UNEF .4143 .4189 .4178 .0003 .0003 0°15'
1/2 - 13 UNC .4500 .4565 .4548 .0003 .0003 0°10'
1/2 - 20 UNF .4675 .4731 .4717 .0003 .0003 0°15'
1/2 - 28 UNEF .4768 .4816 .4804 .0003 .0003 0°15'
9/16 - 12 UNC .5084 .5152 .5135 .0003 .0003 0°10'
9/16 - 18 UNF .5264 .5323 .5308 .0003 .0003 0°10'
9/16 - 24 UNEF .5354 .5405 .5392 .0003 .0003 0°15'
5/8 - 11 UNC .5660 .5732 .5714 .0003 .0003 0°10'
5/8 - 18 UNF .5889 .5949 .5934 .0003 .0003 0°10'
5/8 - 24 UNEF .5979 .6031 .6018 .0003 .0003 0°15'
11/16 - 24 UNEF .6604 .6656 .6643 .0003 .0003 0°15'
3/4 - 10 UNC .6850 .6927 .6907 .0003 .0003 0°10'
3/4 - 16 UNF .7094 .7159 .7143 .0003 .0003 0°10'
3/4 - 20 UNEF .7175 .7232 .7218 .0003 .0003 0°15'
13/16 - 20 UNEF .7800 .7857 .7843 .0003 .0003 0°15'
7/8 - 9 UNC .8028 .8110 .8089 .0003 .0003 0°10'
7/8 - 14 UNF .8286 .8356 .8339 .0003 .0003 0°10'
7/8 - 20 UNEF .8425 .8482 .8468 .0003 .0003 0°15'
15/16 - 20 UNEF .9050 .9109 .9094 .0003 .0003 0°15'
1”- 8 UNC .9188 .9276 .9254 .0004 .0004 0°05'
1”- 12 UNF .9459 .9535 .9516 .0003 .0003 0°10'
1”- 14 UNS .9536 .9609 .9590 .0003 .0003 0°10'
1”- 20 UNEF .9675 .9734 .9719 .0003 .0003 0°15'
1 1/16 - 12 UN 1.0084 1.0158 1.0139 .0003 .0003 0°10'
1 1/16 - 18 UNEF 1.0264 1.0326 1.0310 .0003 .0003 0°10'
1 1/8 - 7 UNC 1.0322 1.0416 1.0393 .0004 .0004 0°05'
1 1/8 - 12 UNF 1.0709 1.0787 1.0768 .0003 .0003 0°10'
1 1/8 - 18 UNEF 1.0889 1.0951 1.0935 .0003 .0003 0°10'
1 3/16 - 12 UN 1.1334 1.1409 1.1390 .0003 .0003 0°10'
1 3/16 - 18 UNEF 1.1514 1.1577 1.1561 .0003 .0003 0°10'
1 1/4 - 7 UNC 1.1572 1.1668 1.1644 .0004 .0004 0°05'
1 1/4 - 12 UNF 1.1959 1.2039 1.2019 .0003 .0003 0°10'
1 1/4 - 18 UNEF 1.2139 1.2202 1.2186 .0003 .0003 0°10'
1 5/16 - 12 UN 1.2584 1.2659 1.2640 .0003 .0003 0°10'
1 5/16 - 18 UNEF 1.2764 1.2827 1.2811 .0003 .0003 0°10'
1 3/8 - 6 UNC 1.2667 1.2771 1.2745 .0004 .0004 0°05'
1 3/8 - 12 UNF 1.3209 1.3291 1.3270 .0003 .0003 0°10'
1 3/8 - 18 UNEF 1.3389 1.3452 1.3436 .0003 .0003 0°10'
1 7/16 - 12 UN 1.3834 1.3910 1.3891 .0003 .0003 0°10'
1 7/16 - 18 UNEF 1.4014 1.4079 1.4062 .0003 .0003 0°10'
1 1/2 - 6 UNC 1.3917 1.4022 1.3996 .0004 .0004 0°05'
1 1/2 - 12 UNF 1.4459 1.4542 1.4522 .0003 .0003 0°10'
1 1/2 - 18 UNEF 1.4639 1.4704 1.4687 .0003 .0003 0°10'

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