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< Reversible Thread Plug Gages (Standard)
< Taperlock Thread Plug Gages
< Helical Coil Gages
< Metric Thread Gages
< Pipe Thread Gages
< Thread Ring Gages
< Truncated Thread Setting Plug Gages
  Reference Sheets  
< Thread Gage Tolerances- Class Y
< Thread Gage Tolerances- Class W
< Thread Gage Tolerances- Class X
< Metric Thread Gages- Thread Rings & Setting Plugs
< Metric Thread Gages- Thread Work Plugs
< American National Taper Pipe Thread Gages- NPT
< Pipe Thread Gages
< Unified Thread Gages- Thread Rings & Settings
< Unified Thread Gages- Thread Work Plugs Pitch & Diameter
< Gage Pipe Plugs- Internal & External
 
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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