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| Thread specifications (d) | ST2.5 | ST3 | ST3.5 | ST4.0 | ST5 | ST6 | ||
| P | Pitch | 0.91 | 1.06 | 1.27 | 1.41 | 1.59 | 1.81 | |
| a | Max | 0.91 | 1.06 | 1.27 | 1.41 | 1.59 | 1.81 | |
| dk | Max | 5.7 | 6.9 | 8.1 | 9.4 | 11.8 | 14 | |
| Min | 5.3 | 6.4 | 7.6 | 8.9 | 11.2 | 13.3 | ||
| k | Max | 1.6 | 2.05 | 2.35 | 2.65 | 3.25 | 3.9 | |
| Min | 1.4 | 1.75 | 2.05 | 2.35 | 2.95 | 3.5 | ||
| y | Type C | 2 | 2.6 | 3.2 | 3.7 | 4.3 | 6 | |
| F, FT type | 1.6 | 2.1 | 2.5 | 2.8 | 3.2 | 3.6 | ||
| Slot Number | 1 | 1 | 2 | 2 | 2 | 3 | ||
| M | Max | 2.5 | 2.9 | 3.9 | 4.2 | 4.9 | 6.2 | |