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Thread Work Plugs

Alpha Thread Gage, Inc.

Mailing address:
  PO Box 261
 

 Royal Oak, MI  
  48068-0261

E-MAIL: alphathread@aol.com

Leading the pack in the thread gage industry.

 

PHONE (248) 585-5800 · FAX (248) 583-9800

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REFERENCE SHEET

Reference Sheets Available [ Thread Gage Tolerances- Class Y Tolerances ] [ Thread Gage Tolerances- Class W Tolerances ] [ Thread Gage Tolerances- Class X Tolerances ] [ 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 Work Plugs- Pitch Diameter Chart ] [ Unified Thread Gages- Thread Ring and Setting Plugs ] [ Gage Pipe Plugs- Internal and External ]
UNIFIED THREAD GAGES

Pitch Diameter Chart

Thread Work Plugs
NOMINAL SIZE Go Basic NoGo 2B NoGo 3B   NOMINAL SIZE Go Basic NoGo 2B NoGo 3B
0-80 UNF .0519 .0542 .0536   9/16-24 UNEF .5354 .5405 .5392
1-64 UNC .0629 .0655 .0648   5/8-11 UNC .5660 .5732 .5714
1-72 UNF .0640 .0665 .0659   5/8-18 UNF .5889 .5949 .5934
2-56 UNC .0744 .0772 .0765   5/8-24 UNEF .5979 .6031 .6018
2-64 UNF .0759 .0786 .0779   11/16-24 UNEF .6604 .6656 .6643
3-48 UNC .0855 .0885 .0877   3/4-10 UNC .6850 .6927 .6907
3-56 UNF .0874 .0902 .0895   3/4-16 UNF .7094 .7159 .7143
4-40 UNC .0958 .0991 .0982   3/4-20 UNEF .7175 .7232 .7218
4-48 UNF .0985 .1016 .1008   13/16-20 UNEF .7800 .7857 .7843
5-40 UNC .1088 .1121 .1113   7/8-9 UNC .8028 .8110 .8089
5-44 UNF .1102 .1134 .1126   7/8-14 UNF .8286 .8356 .8339
6-32 UNC .1177 .1214 .1204   7/8-20 UNEF .8425 .8482 .8468
6-40 UNF .1218 .1252 .1243   15/16-20 UNEF .9050 .9109 .9094
8-32 UNC .1437 .1475 .1465   1-8 UNC .9188 .9276 .9254
8-36 UNF .1460 .1496 .1487   1-12 UNF .9459 .9535 .9516
10-24 UNC .1629 .1672 .1661   1-14 UNS .9536 .9609 .9590
10-32 UNF .1697 .1736 .1726   1-20 UNEF .9675 .9734 .9719
12-24 UNC .1889 .1933 .1922   1 1/16-12 UNF 1.0084 1.0158 1.0139
12-28 UNF .1928 .1970 .1959   1 1/16-18 UNEF 1.0264 1.0326 1.0310
12-32 UNEF .1957 .1998 .1988   1 1/8-7 UNC 1.0322 1.0416 1.0393
1/4-20 UNC .2175 .2224 .2211   1 1/8-12 UNF 1.0709 1.0787 1.0768
1/4-28 UNF .2268 .2311 .2300   1 1/8-18 UNEF 1.0889 1.0951 1.0935
1/4-32 UNEF .2297 .2339 .2328   1 3/16-12 UNF 1.1334 1.1409 1.1390
5/16-18 UNC .2764 .2817 .2803   1 3/16-18 UNEF 1.1514 1.1577 1.1561
5/16-24 UNF .2854 .2902 .2890   1 1/4-7 UNC 1.1572 1.1668 1.1644
5/16-32 UNEF .2922 .2964 .2953   1 1/4-12 UNF 1.1959 1.2039 1.2019
3/8-16 UNC .3344 .3401 .3387   1 1/4-18 UNEF 1.2139 1.2202 1.2186
3/8-24 UNF .3479 .3528 .3516   1 5/16-12 UNF 1.2584 1.2659 1.2640
3/8-32 UNEF .3547 .3591 .3580   1 5/16-18 UNEF 1.2764 1.2827 1.2811
7/16-14 UNC .3911 .3972 .3957   1 3/8-6 UNC 1.2667 1.2771 1.2745
7/16-20 UNF .4050 .4104 .4091   1 3/8-12 UNF 1.3209 1.3291 1.3270
7/16-28 UNEF .4143 .4189 .4178   1 3/8-18 UNEF 1.3389 1.3452 1.3436
1/2-13 UNC .4500 .4565 .4548   1 7/16-12 UNF 1.3834 1.3910 1.3891
1/2-20 UNF .4675 .4731 .4717   1 7/16-18 UNEF 1.4014 1.4079 1.4062
1/2-28 UNEF .4768 .4816 .4804   1 1/2-6 UNC 1.3917 1.4022 1.3996
9/16-12 UNC .5084 .5152 .5135   1 1/2-12 UNF 1.4459 1.4542 1.4522
9/16-18 UNF .5264 .5323 .5308   1 1/2-18 UNEF 1.4639 1.4704 1.4687

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