| Code | Taper | Remark | Threads per inch | Inspection Elements |
|---|---|---|---|---|
| 6253-N1 | 1:16 | can calibrate 4 1/2"~13 3/8" buttress internal thread gauge | 5 | buttress tooth width |
| 6253-W1 | 1:16 | can calibrate 4 1/2"~13 3/8" buttress external thread gauge | 5 | buttress tooth width |
| 6253-N2 | 1:12 | can calibrate ≥16" buttress internal thread gauge | 5 | buttress tooth width |
| 6253-W2 | 1:12 | can calibrate ≥16" buttress external thread gauge | 5 | buttress tooth width |




