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NPT螺纹底孔表 |
| 准备攻丝的螺纹 | 钻头规格代码 | (最接近的英制分数规格) | 英制小数规格 |
| 1/8"-27NPT | 字母R | - | .3390 |
| 1/4"-18NPT | 7/16" | 7/16" | .4375 |
| 3/8"-18NPT | 37/64" | 37/64" | .5781 |
| 1/2"-14NPT | 45/64" | 45/64" | .7031 |
| 3/4"-14NPT | 59/64" | 59/64" | .9219 |
| 1"-11½ NPT | 15/32" | 15/32" | 1.1562 |
| 1¼"-11 ½ NPT | 1½" | 1½" | 1.5000 |
| 1½"-11 ½ NPT | 147/64" | 147/64" | 1.7344 |
| 2"-11½ NPT | 27/32" | 27/32" | 2.2188 |