41 十字槽半沉头自钻自攻螺钉GB/T 15856.3—2002
十字槽半沉头自钻自攻螺钉GB15856.3—2002
十字槽半沉头自钻自攻螺钉的尺寸规格质量见表4.2-98、表4.2-99。
表4.2-98 十字槽半沉头自钻自攻螺钉的尺寸规格（mm)
| 螺纹规格 | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
| 头部直径dk max | 5.5 | 7.3 | 8.4 | 9.3 | 10.3 | 11.3 |
| 球面高度 f ≈ | 0.7 | 0.8 | 1 | 1.2 | 1.3 | 1.4 |
| 头部高度 k max | 1.7 | 2.35 | 2.6 | 2.8 | 3 | 3.15 |
| 钻头直径dp ≈ | 2.3 | 2.8 | 3.6 | 4.1 | 4.8 | 5.8 |
| 十字槽号 | 1 | 2 | 2 | 2 | 3 | 3 |
| 公称长度l 范围 | 13-19 | 13-25 | 13-38 | 13-50 | 16-50 | 19-50 |
表4.2-99 十字槽半沉头自钻自攻螺钉的质量
每1000件钢制品的质量（p = 7.85 g/cm3) /kg
| l | G | l | G | l | G | l | G | l | G |
| ST2.9 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | |||||
| 13 | 0.5 | 13 | 1.25 | 13 | 1.7 | 16 | 2.47 | 19 | 3.81 |
| 16 | 0.59 | 16 | 1.45 | 16 | 1.94 | 19 | 2.82 | 22 | 4.29 |
| 19 | 0.68 | 19 | 1.65 | 19 | 2.2 | 22 | 3.17 | 25 | 4.77 |
| ST3.5 | 22 | 1.85 | 22 | 2.47 | 25 | 3.52 | 32 | 5.89 | |
| 13 | 0.82 | 25 | 2.05 | 25 | 2.73 | 32 | 4.34 | 38 | 6.85 |
| 16 | 0.96 | 32 | 2.5 | 32 | 3.35 | 38 | 5.05 | 45 | 7.97 |
| 19 | 1.09 | 38 | 2.9 | 38 | 3.88 | 45 | 5.87 | 50 | 8.77 |
| 22 | 1.23 | 45 | 4.5 | 50 | 6.46 | ||||
| 25 | 1.37 | 50 | 4.95 | ||||||