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石油鉆桿塞規(guī)，石油鉆桿環(huán)規(guī)，NC量規(guī)
Standard No.GB/T 4749
Standard No.GB/T 4749
| 公稱直徑 | 螺距 | 錐度 | |
| Gage code | Tooth No. | Pitch | Taper |
| NC10 | 6 | 4.233 | 1：8 |
| NC12 | |||
| NC13 | |||
| NC16 | |||
| NC23 | 4 | 6.350 | 1：6 |
| NC26 | |||
| NC31 | |||
| NC35 | |||
| NC38 | |||
| NC40 | |||
| NC44 | |||
| NC46 | |||
| NC50 | |||
| NC56 | 1：4 | ||
| NC61 | |||
| NC70 | |||
| NC77 | |||
石油鉆桿塞規(guī)，石油鉆桿環(huán)規(guī)，NC量規(guī)