SJ 2824 - 1984 十字槽大扁头自攻钉（ST 2.5~ST 6）
See all versions and complete specifications: Cross Recessed Pan Head Tapping Screws — Full Specification Page
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ST3 | 1.41 | 1.93 | 4 | 0.5 | 4.6 | 1.41 | 8.5 | 2.55 | 2 | 8 | 2.85 |
| ST2.5 | 1.06 | 1.63 | 3.7 | 0.4 | 3.4 | 1.06 | 6.4 | 2.3 | 2 | 5.9 | 2.6 |
| ST3.5 | 1.81 | 2.86 | 6.2 | 0.7 | 6.7 | 1.81 | 12.5 | 3.9 | 3 | 11.8 | 4.3 |
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