| 美製管螺紋 | 管用螺紋(PT) | |||||||
| 規格 | 鑽頭徑( )內英制尺寸 | 規格 | 鑽頭徑 | 有效螺紋長度用內徑 | 標用 | |||
| NPT | NPSC | 鉸刀時 | 不用鉸刀時 | |||||
| 使用鉸刀時 | 不使用鉸刀時 | PT1\16-28 | 6.1 | 6.2 | 6.244 | 6 | ||
| . | 5.94(0.23) | 6.15(0.242) | 6.35(0.250) | PT1\8-28 | 8.1 | 8.2 | 8.249 | 8 |
| 1\8-27 | 8.33(0.328) | 8.43(0.332) | 8.74(0.344) | PT1\4-19 | 10.7 | 11 | 10.926 | 11 |
| 1\4-18 | 10.72(0.422) | 11.13(0.438) | 11.13(0.438) | PT3\8-19 | 14.2 | 14.5 | 14.448 | 14 |
| 3\8-18 | 14.27(0.526) | 14.27(0.562) | 14.68(0.578) | PT1\2-14 | 17.6 | 18 | 17.979 | 18 |
| 1\2-14 | 17.48(0.688) | 17.86(0.703) | 18.26(0.719) | PT3\4-14 | 23 | 23.5 | 23.378 | 23 |
| 3\4-14 | 22.63(0.891) | 23.0(0.906) | 23.42(0.922) | PT1-11 | 29 | 29.5 | 29.459 | 29 |
| 1--111\2 | 28.58(1.125) | 28.98(1.414) | 29.36(1.156) | PT11\4-11 | 37 | 38 | 37.976 | 38 |
| 11\4-111\2 | 37.31(1.469) | 37.69(1.484) | 38.1(1.5) | PT11\2-11 | 43 | 44 | 43.869 | 42 |
| 11\2-111\2 | 43.26(1.703) | 43.66(1.719) | 44.45(1.750) | PT2-11 | 54 | 55.5 | 55.412 | 55 |
| 2-111\2 | 55.17(2.172) | 55.58(2.188) | 56.36(2.219) | 管用螺紋(PF) | ||||
| 21\2-8 | 65.48(2.578) | 66.27(2.609) | 67.46(2.656) | 規格 | 鑽頭徑 | AB級螺紋內徑 | ||
| 乾封美製管螺紋 | 上限 | 下限 | ||||||
| 規格 | 鑽頭徑( )內英制尺寸 | PF1\16-28 | 6.7 | 6.843 | 6.561 | |||
| NPTF | NPSF | PF1\8-28 | 8.7 | 8.848 | 8.566 | |||
| 使用鉸刀時 | 不使用鉸刀時 | PF1\4-19 | 11.7 | 11.89 | 11.445 | |||
| 1\16-27 | 5.94(0.234) | 6.15(0.242) | 6.25(0.246) | PF3\8-19 | 15.2 | 15.395 | 14.95 | |
| 1\8-27 | 8.33(0.328) | 8.43(0.322) | 8.61(0.339) | PF1\2-14 | 19 | 19.172 | 18.631 | |
| 1\4-18 | 10.72(0.422) | 11.13(0.438) | 11.13(0.438) | PF5\8-14 | 21 | 21.128 | 20.587 | |
| 3\8-18 | 14.27(0.562) | 14.27(0.526) | 14.68(0.578) | PF3\4-14 | 24.5 | 24.658 | 24.117 | |
| 1\2-14 | 17.48(0.688) | 17.86(0.703) | 17.86(0.703) | PF7\8-14 | 28.2 | 28.418 | 27.887 | |
| 3\4-14 | 22.63(0.891) | 23.01(0.906) | 23.42(0.922) | PF1--11 | 30.5 | 30.931 | 30.291 | |
| 1-111\2 | 28.58(1.125) | 28.98(1.141) | 29.36(1.156) | PF11\8-11 | 35.2 | 35.579 | 34.93.9 | |
| 11\4-111\2 | 37.31(1.469) | 37.69(1.484) | PF11\4-11 | 39.2 | 39.592 | 38.952 | ||
| 11\2-111\2 | 43.26(1.703) | 43.66(1.719) | PF11\2-11 | 45 | 45.458 | 44.845 | ||
| 2-111\2 | 55.17(2.172) | 55.58(2.188) | PF13\4-11 | 51 | 51.428 | 50.788 | ||
| 21\2-8 | 65.48(2.578) | 66.27(2.609) | PF2-11 | 57 | 57.296 | 56.656 | ||
| 管用螺紋(PS) | ||||||||
| 規格 | 鑽頭徑 | 螺紋內徑 | ||||||
| 上限 | 下限 | |||||||
| PS1\16-28 | 6.5 | 6.632 | 6.4 | |||||
| PS1\8-28 | 8.5 | 8.637 | 8.4 | |||||
| PS1\4-19 | 11.4 | 11.549 | 11.3 | |||||
| PS3\8-19 | 15 | 15.054 | 14.8 | |||||
| PS1\2-14 | 18.5 | 18.773 | 18.4 | |||||
| PS3\4-14 | 24 | 24.259 | 23.9 | |||||
| PS1--11 | 30.2 | 30.471 | 30.1 | |||||
| PS11\4-11 | 38.8 | 39.132 | 38.7 | |||||
| PS11\2-11 | 44.8 | 45.025 | 44.6 | |||||
| PS--11 | 56.5 | 56.863 | 56.4 | |||||
