規格和螺紋數/英寸
| 系列名稱
| 內螺紋級別
| 內螺紋小徑最小
| 內螺紋小徑最大
| 內螺紋齒距(螺距)最小
| 內螺紋齒距(螺距)最大
| 內螺紋齒距(螺距)公差
| 內螺紋大徑最小
| 6-32
| UNC
| 2B
| 2.6416
| 2.8956
| 2.9896
| 3.0836
| 0.0940
| 3.5052
| 8-32
| UNC
| 2B
| 3.3020
| 3.5306
| 3.6500
| 3.7465
| 0.0965
| 4.1656
| 10-24
| UNC
| 2B
| 3.6830
| 3.9624
| 4.1377
| 4.2469
| 0.1092
| 4.8260
| 12-24
| UNC
| 2B
| 4.3434
| 4.5974
| 4.7981
| 4.9098
| 0.1118
| 5.4864
| 1/4-20
| UNC
| 2B
| 4.9784
| 5.2578
| 5.5245
| 5.6490
| 0.1245
| 6.3500
| 5/16-18
| UNC
| 2B
| 6.4008
| 6.7310
| 7.0206
| 7.1552
| 0.1346
| 7.9375
| 3/8-16
| UNC
| 2B
| 7.7978
| 8.1534
| 8.4938
| 8.6385
| 0.1448
| 9.5250
| 7/16-14
| UNC
| 2B
| 9.1440
| 9.5504
| 9.9339
| 10.0889
| 0.1549
| 11.1125
|
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