Hexagon Washer Head Drilling Screws with Tapping Screw Thread
Q 209 六角凸缘（华司）自钻自攻螺钉
See all versions and complete specifications: Hexagon Washer Head Drilling Screws with Tapping Screw Thread — Full Specification Page
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ST2.9 | 1.3 | 1.5 | 1.3 | 5.5 | 5.32 | 8.3 | 7.6 | 3 | 0.7~2.25 | 0.6 | 3.4 |
| ST3.5 | 1.6 | 2.2 | 1.6 | 8 | 7.78 | 10.5 | 9.8 | 3.8 | 1.75~4.4 | 0.9 | 4.3 |
| ST4.2 | 1.8 | 3.1 | 1.8 | 10 | 9.78 | 13.5 | 12.2 | 5.3 | 2.0~6.0 | 1 | 5.9 |
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