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Phone: 203-753-5121
Fax: 203-755-9011
Toll-free: 800-992-3233

Email us:
sales@danco-inc.com


Hours: 8am-5pm est
Mon-Fri
Standard Pitch diameters for Unified Inch Thread Ring & Set Plug Gages
NOMINAL SIZE2A GO2A NOGO3A GO3A NOGO
# 0-80 UNF
.0514
.0496
.0519
.0506
# 1-64 UNC
.0623
.0603
.0629
.0614
# 1-72 UNF
.0634
.0615
.0640
.0626
# 2-56 UNC
.0738
.0717
.0744
.0728
# 2-64 UNF
.0753
.0733
.0759
.0744
# 3-48 UNC
.0848
.0825
.0855
.0838
# 3-56 UNF
.0867
.0845
.0874
.0858
# 4-40 UNC
.0950
.0925
.0958
.0939
# 4-48 UNF
.0978
.0954
.0985
.0967
# 5-40 UNC
.1080
.1054
.1088
.1069
# 5-44 UNF
.1095
.1070
.1102
.1083
# 6-32 UNC
.1169
.1141
.1177
.1156
# 6-40 UNF
.1210
.1184
.1218
.1198
# 8-32 UNC
.1428
.1399
.1437
.1415
# 8-36 UNF
.1452
.1424
.1460
.1439
# 10-24 UNC
.1619
.1586
.1629
.1604
# 10-32 UNF
.1688
.1658
.1697
.1674
# 12-24 UNC
.1879
.1845
.1889
.1863
# 12-28 UNF
.1918
.1886
.1928
.1904
# 12-32 UNEF
.1948
.1917
.1957
.1933
1/4"-20 UNC
.2164
.2127
.2175
.2147
1/4"-28 UNF
.2258
.2225
.2268
.2243
1/4"-32 UNEF
.2287
.2255
.2297
.2273
5/16"-18 UNC
.2752
.2712
.2764
.2734
5/16"-24 UNF
.2843
.2806
.2854
.2827
5/16"-32 UNEF
.2912
.2880
.2922
.2898
3/8"-16 UNC
.3331
.3287
.3344
.3311
3/8"-24 UNF
.3468
.3430
.3479
.3450
3/8"-32 UNEF
.3537
.3503
.3547
.3522
7/16"-14 UNC
.3897
.3850
.3911
.3876
7/16"-20 UNF
.4037
.3995
.4050
.4019
7/16"-28 UNEF
.4132
.4096
.4143
.4116
1/2"-13 UNC
.4485
.4435
.4500
.4463
1/2"-20 UNF
.4662
.4619
.4675
.4643
1/2"-28 UNEF
.4757
.4720
.4768
.4740
9/16"-12 UNC
.5068
.5016
.5084
.5045
9/16"-18 UNF
.5250
.5205
.5264
.5230
9/16"-24 UNEF
.5342
.5303
.5354
.5325
5/8"-11 UNC
.5644
.5589
.5660
.5619
5/8"-18 UNF
.5875
.5828
.5889
.5854
5/8"-24 UNEF
.5967
.5927
.5979
.5949
11/16"-24 UNEF
.6592
.6552
.6604
.6574
3/4"-10 UNC
.6832
.6773
.6850
.6806
3/4"-16 UNF
.7079
.7029
.7094
.7056
3/4"-20 UNEF
.7162
.7118
.7175
.7142
13/16"-20 UNEF
.7787
.7743
.7800
.7767
7/8"-9 UNC
.8009
.7946
.8028
.7981
7/8"-14 UNF
.8270
.8216
.8286
.8245
7/8"-20 UNEF
.8412
.8368
.8425
.8392
15/16"-20 UNEF
.9036
.8991
.9050
.9016
1"-8 UNC
.9168
.9100
.9188
.9137
1"-12 UNF
.9441
.9382
.9459
.9415
1"-14 UNS
.9519
.9463
.9536
.9494
1"-20 UNEF
.9661
.9616
.9675
.9641
1-1/16"-12 UN
1.0067
1.0010
1.0084
1.0042
1-1/16"-18 UNEF
1.0250
1.0203
1.0264
1.0228
1-1/8"-7 UNC
1.0300
1.0228
1.0322
1.0268
1-1/8"-12 UNF
1.0691
1.0631
1.0709
1.0664
1-1/8"-18 UNEF
1.0875
1.0828
1.0889
1.0853
1-3/16"-12 UN
1.1317
1.1259
1.1334
1.1291
1-3/16"-18 UNEF
1.1499
1.1450
1.1514
1.1478
1-1/4"-7 UNC
1.1550
1.1476
1.1572
1.1517
1-1/4"-12 UNF
1.1941
1.1879
1.1959
1.1913
1-1/4"-18 UNEF
1.2124
1.2075
1.2139
1.2103
1-5/16"-12 UN
1.2567
1.2509
1.2584
1.2541
1-5/16"-18 UNEF
1.2749
1.2700
1.2764
1.2728
1-3/8"-6 UNC
1.2643
1.2563
1.2667
1.2607
1-3/8"-12 UNF
1.3190
1.3127
1.3209
1.3162
1-3/8"-18 UNEF
1.3374
1.3325
1.3389
1.3353
1-7/16"-12 UN
1.3816
1.3757
1.3834
1.3790
1-7/16"-18 UNEF
1.3999
1.3949
1.4014
1.3977
1-1/2"-6 UNC
1.3893
1.3812
1.3917
1.3856
1-1/2"-12 UNF
1.4440
1.4376
1.4459
1.4411
1-1/2"-18 UNEF
1.4624
1.4574
1.4639
1.4602