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美標圓錐管螺紋環規，美標圓錐管螺紋塞規，NTP規
型號：H-28/8
型號：H-28/8
| 公稱直徑 | 螺距 | 錐度 | |
| Gage code | Tooth No. | Pitch | Taper |
| 1/16 NPT | 27 | 0.941 | 1：16 |
| 1/8 NPT | |||
| 1/4 NPT | 18 | 1.411 | |
| 3/8 NPT | |||
| 1/2 NPT | 14 | 1.814 | |
| 3/4 NPT | |||
| 1 NPT | 11．5 | 2.209 | |
| 1 1/4 NPT | |||
美標圓錐管螺紋環規，美標圓錐管螺紋塞規，NTP規
| 公稱直徑 | 螺距 | 錐度 | |
| Gage code | Tooth No. | Pitch | Taper |
| 1 1/2 NPT | 11.5 | 2.209 | 1：16 |
| 2 NPT | |||
| 2 1/2 NPT | 8 | 3.175 | |
| 3 NPT | |||
| 3 1/2 NPT | |||
| 4 NPT | |||
| 5 NPT | |||
| 6 NPT | |||