技术文章
英制钢丝螺套（螺纹护套）粗细牙尺寸规格参数
英制钢丝螺套（螺纹护套）粗细牙尺寸规格参数明细如下：
UNC 表示为粗牙，UNF表示为细牙
| UNC UNF统一螺纹 钢丝螺套（螺纹护套）规格参数表 |
| 直径号-牙数 | 直径 | 螺距 | k×d | 安装后长度L(mm) | 安装前圈数N(≈) | 安装前外径(mm) | 钻头直径do(mm) |
| 2-56 | 2.184 | | 1d | 2.18 | 3.3 | 2.7-3.1 | 2.3 |
| 0.454 | 1.5d | 3.28 | 5 |
| | 2d | 4.37 | 6.8 |
| 4-40 | 2.845 | | 1d | 2.9 | 3.2 | 3.6-4.0 | 3.0 |
| 0.635 | 1.5d | 4.3 | 5.1 |
| | 2d | 5.8 | 7.2 |
| 5-40 | 3.175 | | 1d | 3.2 | 3.7 | 4.0-4.4 | 3.3 |
| 0.635 | 1.5d | 4.8 | 5.9 |
| | 2d | 6.4 | 8.2 |
| 6-32 | 3.505 | | 1d | 3.5 | 2.8 | 4.5-4.9 | 3.7 |
| 0.794 | 1.5d | 5.3 | 4.8 |
| | 2d | 7 | 6.8 |
| 8-32 | 4.166 | | 1d | 4.2 | 4 | 5.2-5.6 | 4.4 |
| 0.794 | 1.5d | 6.25 | 6 |
| | 2d | 8.3 | 8.7 |
| 8-36 | 4.166 | | 1d | 4.2 | 4.5 | 5.1-5.6 | 4.3 |
| 0.706 | 1.5d | 6.3 | 7.2 |
| | 2d | 8.3 | 9.7 |
| 10-24 | 4.826 | | 1d | 4.8 | 3.3 | 6.1-6.6 | 5.1 |
| 1.058 | 1.5d | 7.2 | 5.4 |
| | 2d | 9.6 | 7.5 |
| 10-32 | 4.826 | | 1d | 4.83 | 4.3 | 5.9-6.5 | 5.0 |
| 0.794 | 1.5d | 7.24 | 6.9 |
| | 2d | 9.6 | 9.5 |
| 12-24 | 5.486 | | 1d | 5.5 | 4 | 6.8-7.2 | 5.8 |
| 1.058 | 1.5d | 8.2 | 6.3 |
| | 2d | 11 | 8.8 |
| 1/4"-20 | 6.35 | | 1d | 6.4 | 3.9 | 7.8-8.3 | 6.7 |
| 1.27 | 1.5d | 9.5 | 6.2 |
| | 2d | 12.7 | 8.6 |
| 1/4"-28 | 6.35 | | 1d | 6.35 | 5.3 | 7.7-8.3 | 6.6 |
| 0.907 | 1.5d | 9.5 | 8.6 |
| | 2d | 12.7 | 11.8 |
| 5/16"-18 | 7.938 | | 1d | 7.9 | 4.3 | 9.6-10.2 | 8.3 |
| 1.411 | 1.5d | 11.9 | 6.8 |
| | 2d | 15.9 | 9.4 |
| 5/16"-24 | 7.938 | | 1d | 7.9 | 5.9 | 9.6-10.2 | 8.2 |
| 1.058 | 1.5d | 11.9 | 9.4 |
| | 2d | 15.9 | 12.8 |
| 3/8"-16 | 9.525 | | 1d | 9.5 | 4.8 | 11.4-11.9 | 9.9 |
| 1.588 | 1.5d | 14.3 | 7.7 |
| | 2d | 19.1 | 10.6 |
| 3/8"-24 | 9.525 | | 1d | 9.5 | 7.3 | 11.4-11.9 | 9.8 |
| 1.058 | 1.5d | 14.3 | 11.5 |
| | 2d | 19.1 | 15.6 |
| 7/16"-14 | 11.113 | | 1d | 11.1 | 4.9 | 13.3-13.9 | 11.6 |
| 1.814 | 1.5d | 16.7 | 7.9 |
| | 2d | 22.2 | 10.7 |
| 7/16"-20 | 11.113 | | 1d | 11.1 | 7 | 13.3-13.7 | 11.4 |
| 1.27 | 1.5d | 16.7 | 11.1 |
| | 2d | 22.2 | 15 |
| 1/2"-13 | 12.7 | | 1d | 12.7 | 5.2 | 15.1-15.7 | 13.2 |
| 1.954 | 1.5d | 19.1 | 8.3 |
| | 2d | 25.4 | 11.4 |
| 1/2"-20 | 12.7 | | 1d | 12.7 | 7.9 | 15-15.6 | 13.0 |
| 1.27 | 1.5d | 19.1 | 12.8 |
| | 2d | 25.4 | 17.3 |
| 9/16"-18 | 14.288 | | 1d | 14.3 | 7.9 | 16.91-17.55 | 14.6 |
| 1.411 | 1.5d | 21.5 | 12 |
| | 2d | 28.6 | 16 |
| 5/8"-11 | 15.875 | | 1d | 15.9 | 5.7 | 18.8-19.4 | 16.5 |
| 2.309 | 1.5d | 23.8 | 9 |
| | 2d | 31.8 | 12.3 |
| 5/8"-18 | 15.875 | | 1d | 15.9 | 9.4 | 18.6-19.3 | 16.2 |
| 1.411 | 1.5d | 23.8 | 14.5 |
| | 2d | 31.8 | 19.7 |
| 3/4"-10 | 19.05 | | 1d | 19.1 | 6.3 | 22.3-23.0 | 19.7 |
| 2.54 | 1.5d | 28.6 | 9.9 |
| | 2d | 38.1 | 13.5 |
| 3/4"-16 | 19.05 | | 1d | 19.1 | 10.1 | 22.2-22.8 | 19.4 |
| 1.588 | 1.5d | 28.6 | 15.6 |
| | 2d | 31.8 | 21 |
| 7/8"-14 | 22.225 | | 1d | 22.2 | 10.3 | 25.9-26.7 | 22.6 |
| 1.814 | 1.5d | 33.3 | 15.9 |
| | 2d | 44.5 | 21.6 |
| 1"-8 | 25.4 | | 1d | 25.4 | 6.8 | 29.6-30.4 | 26.1 |
| 3.175 | 1.5d | 38.1 | 10.6 |
| | 2d | 50.8 | 15.4 |
| 1"-12 | 25.4 | 2.117 | 1d | 25.4 | 10 | 29.6-30.4 | 30.0 |
| 1.5d | 38.1 | 15.6 |
| 1"-14 | 25.4 | | 1d | 25.4 | 11.8 | 29.6-30.4 | 25.9 |
| 1.814 | 1.5d | 38.1 | 18.1 |
| | 2d | 50.8 | 24.5 |