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| NR. | Type | Specification | Usage |
| 642-021 | ZJY20-W | 2 3/8~20in | |
| Measure the middle diameter of outer screw. | |||
| 642-022 | ZJY20-N | 2 3/8~20in | |
| Measure the middle diameter of inner screw. | |||
| 642-023 | BZG-W | 2 3/8~20in | . |
| Rectify outer screw middle diameter measuring instrument | |||
| 642-024 | BZG-N | 2 3/8~20in | . |
| Rectify inner screw middle diameter measuring instrument |
instrument for pipe screw thread