| Code | Taper | Number of thread per inch | Inspection Elements |
|---|---|---|---|
| 6255-038 | 1:6 and 1:4 | 4 | thread height |
| 6255-040 | 0.044444444444444 | 5 | thread height |
| 6255-050 | 1:6 and 1:4 | 4 | thread height |
| 6255-055 | 0.047222222222222 | 6 | thread height |


Set zero of internal and external thread height measuring instruments (code 2255, 2256)
| Code | Taper | Number of thread per inch | Inspection Elements |
|---|---|---|---|
| 6255-038 | 1:6 and 1:4 | 4 | thread height |
| 6255-040 | 0.044444444444444 | 5 | thread height |
| 6255-050 | 1:6 and 1:4 | 4 | thread height |
| 6255-055 | 0.047222222222222 | 6 | thread height |
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