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Alpha Thread Gage, Inc.

"Leading the pack in the thread gage industry!"                                                                                  

·680 Ajax Drive, Madison Heights, MI 48071-4214·

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REFERENCE SHEET

Reference Sheets Available Basic Dimensions NPT Taper Thread Plug & Ring Gages • Unified Thread Gages- Thread Work Plugs • Unified Thread Gages-Thread Ring and Setting Plugs • Metric Thread Gages-Thread Work Plugs • Metric Thread Gages-Thread Rings & Setting Plugs • Class X Tolerances • Class W Tolerances • Class Y Tolerances
   
UNIFIED THREAD GAGES
Pitch Diameter Chart
Thread Ring and Setting Plugs
NOMINAL SIZE Go 3A NoGo 3A Go 2A NoGo 2A   NOMINAL SIZE Go 3A NoGo 3A Go 2A NoGo 2A
0-80 UNF .0519 .0506 .0514 .0496 9/16-24 UNEF .5354 .5325 .5342 .5303
1-64 UNC .0629 .0614 .0623 .0603 5/8-11 UNC .5660 .5619 .5644 .5589
1-72 UNF .0640 .0626 .0634 .0615 5/8-18 UNF .5889 .5854 .5875 .5828
2-56 UNC .0744 .0728 .0738 .0717 5/8-24 UNEF .5979 .5949 .5967 .5927
2-64 UNF .0759 .0744 .0753 .0733 11/16-24 UNEF .6604 .6574 .6592 .6552
3-48 UNC .0855 .0838 .0848 .0825 3/4-10 UNC .6850 .6806 .6832 .6773
3-56 UNF .0874 .0858 .0867 .0845 3/4-16 UNF .7094 .7056 .7079 .7029
4-40 UNC .0958 .0939 .0950 .0925 3/4-20 UNEF .7175 .7142 .7162 .7118
4-48 UNF .0985 .0967 .0978 .0954 13/16-20 UNEF .7800 .7767 .7787 .7743
5-40 UNC .1088 .1069 .1080 .1054 7/8-9 UNC .8028 .7981 .8009 .7946
5-44 UNF .1102 .1083 .1095 .1070 7/8-14 UNF .8286 .8245 .8270 .8216
6-32 UNC .1177 .1156 .1169 .1141 7/8-20 UNEF .8425 .8392 .8412 .8368
6-40 UNF .1218 .1198 .1210 .1184 15/16-20 UNEF .9050 .9016 .9036 .8991
8-32 UNC .1437 .1415 .1428 .1399 1-8 UNC .9188 .9137 .9168 .9100
8-36 UNF .1460 .1439 .1452 .1424 1-12 UNF .9459 .9415 .9441 .9382
10-24 UNC .1629 .1604 .1619 .1586 1-14 UNS .9536 .9494 .9519 .9463
10-32 UNF .1697 .1674 .1688 .1658 1-20 UNEF .9675 .9641 .9661 .9616
12-24 UNC .1889 .1863 .1879 .1845 1 1/16-12 UNF 1.0084 1.0042 1.0067 1.0010
12-28 UNF .1928 .1904 .1918 .1886 1 1/16-18 UNEF 1.0264 1.0228 1.0250 1.0203
12-32 UNEF .1957 .1933 .1948 .1917 1 1/8-7 UNC 1.0322 1.0268 1.0300 1.0228
1/4-20 UNC .2175 .2147 .2164 .2127 1 1/8-12 UNF 1.0709 1.0664 1.0691 1.0631
1/4-28 UNF .2268 .2243 .2258 .2225 1 1/8-18 UNEF 1.0889 1.0853 1.0875 1.0828
1/4-32 UNEF .2297 .2273 .2287 .2255 1 3/16-12 UNF 1.1334 1.1291 1.1317 1.1259
5/16-18 UNC .2764 .2734 .2752 .2712 1 3/16-18 UNEF 1.1514 1.1478 1.1499 1.1450
5/16-24 UNF .2854 .2827 .2843 .2806 1 1/4-7 UNC 1.1572 1.1517 1.1550 1.1476
5/16-32 UNEF .2922 .2898 .2912 .2880 1 1/4-12 UNF 1.1959 1.1913 1.1941 1.1879
3/8-16 UNC .3344 .3311 .3331 .3287 1 1/4-18 UNEF 1.2139 1.2103 1.2124 1.2075
3/8-24 UNF .3479 .3450 .3468 .3430 1 5/16-12 UNF 1.2584 1.2541 1.2567 1.2509
3/8-32 UNEF .3547 .3522 .3537 .3503 1 5/16-18 UNEF 1.2764 1.2728 1.2749 1.2700
7/16-14 UNC .3911 .3876 .3897 .3850 1 3/8-6 UNC 1.2667 1.2607 1.2643 1.2563
7/16-20 UNF .4050 .4019 .4037 .3995 1 3/8-12 UNF 1.3209 1.3162 1.3190 1.3127
7/16-28 UNEF .4143 .4116 .4132 .4096 1 3/8-18 UNEF 1.3389 1.3353 1.3374 1.3325
1/2-13 UNC .4500 .4463 .4485 .4435 1 7/16-12 UNF 1.3834 1.3790 1.3816 1.3757
1/2-20 UNF .4675 .4643 .4662 .4619 1 7/16-18 UNEF 1.4014 1.3977 1.3999 1.3949
1/2-28 UNEF .4768 .4740 .4757 .4720 1 1/2-6 UNC 1.3917 1.3856 1.3893 1.3812
9/16-12 UNC .5084 .5045 .5068 .5016 1 1/2-12 UNF 1.4459 1.4411 1.4440 1.4376
9/16-18 UNF .5264 .5230 .5250 .5205 1 1/2-18 UNEF 1.4639 1.4602 1.4624 1.4574

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