用于两个构件的联接，开槽圆柱头螺钉多用于较小零件的联接。钉头强度较好，如在被联接件表面上制出相应的圆柱形孔，也可以使钉头不外露。这类螺钉的装拆，须用一字形螺钉旋具进行。
| 螺纹规格 d (6 g) | Ml.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 |
| a max | 0.7 | 0.8 | 0.9 | 1 | 1.4 | 1.6 | 2 | 2.5 | 3 |
| b min | 25 | 25 | 25 | 25 | 38 | 38 | 38 | 38 | 38 |
| dk max | 3 | 3.8 | 4.5 | 5.5 | 7 | 8.5 | 10 | 13 | 16 |
| da max | 2 | 2.6 | 3.1 | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 |
| K max | 1.1 | 1.4 | 1.8 | 2 | 2.6 | 3.3 | 3.9 | 5 | 6 |
| n 公称 | 0.4 | 0.5 | 0.6 | 0.8 | 1.2 | 1.2 | 1.6 | 2 | 2.5 |
| t min | 0.45 | 0.6 | 0.7 | 0.85 | 1.1 | 1.3 | 1.6 | 2 | 2.4 |
| l① 商品规格范围 | 2~16 | 3~20 | 3~25 | 4~30 | 5~40 | 6~50 | 8~60 | 10~80 | 12~80 |
①公称长度系列为：2〜5(1进级）、6〜16(2进级）、20〜80 mm(5 mm迸级）。
| l | G | l | G | l | G | l | G | l | G | l | G | l | G | l | G | l | G | l | G |
| Ml.6 | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | M8 | M10 | ||||||||||
| 2 | 0.07 | 3 | 0.16 | 3 | 0.272 | 4 | 0.515 | 5 | 0.786 | 5 | 1.09 | 6 | 2.06 | 8 | 3.56 | 10 | 7.85 | 12 | 14.6 |
| 3 | 0.082 | 4 | 0.179 | 4 | 0.302 | 5 | 0.56 | 6 | 0.845 | 6 | 1.17 | 8 | 2.3 | 10 | 3.92 | 12 | 8.49 | (14) | 15.6 |
| 4 | 0.094 | 5 | 0.198 | 5 | 0.332 | 6 | 0.604 | 8 | 0.966 | 8 | 1.33 | 10 | 2.55 | 12 | 4.27 | (14) | 9.13 | 16 | 16.6 |
| 5 | 0.105 | 6 | 0.217 | 6 | 0.362 | 8 | 0.692 | 10 | 1.08 | 10 | 1.47 | 12 | 2.8 | (14) | 4.62 | 16 | 9.77 | 20 | 18.6 |
| 6 | 0.117 | 8 | 0.254 | 8 | 0.422 | 10 | 0.78 | 12 | 1.2 | 12 | 1.63 | (14) | 3.05 | 16 | 4.98 | 20 | 11 | 25 | 21.1 |
| 8 | 0.14 | 10 | 0.291 | 10 | 0.482 | 12 | 0.868 | (14) | 1.32 | (14) | 1.79 | 16 | 3.3 | 20 | 5.69 | 25 | 12.6 | 30 | 23.6 |
| 10 | 0.163 | 12 | 0.329 | 12 | 0.542 | (14) | 0.956 | 16 | 1.44 | 16 | 1.95 | 20 | 3.78 | 25 | 6.56 | 30 | 14.2 | 35 | 26.1 |
| 12 | 0.186 | (14) | 0.365 | (14) | 0.602 | 16 | 1.04 | 20 | 1.68 | 20 | 2.25 | 25 | 4.4 | 30 | 7.45 | 35 | 15.8 | 40* | 28.6 |
| (14) | 0.209 | 16 | 0.402 | 16 | 0.662 | 20 | 1.22 | 25 | 1.98 | 25 | 2.64 | 30 | 5.02 | 35 | 8.25 | 40* | 17.4 | 45 | 31.1 |
| 16* | 0.232 | 20* | 0.478 | 20 | 0.782 | 25 | 1.44 | 30 | 2.28 | 30 | 3.02 | 35 | 5.62 | 40* | 9.2 | 45 | 18.9 | 50 | 33.6 |
| 25* | 0.932 | 30* | 1.66 | 35* | 2.57 | 35 | 3.41 | 40* | 6.25 | 45 | 10 | 50 | 20.6 | (55) | 36.1 | ||||
| 40* | 3.8 | 45 | 6.88 | 50 | 10.9 | (55) | 22.1 | 60 | 38.6 | ||||||||||
| 50 | 7.5 | (55) | 11.8 | 60 | 23.7 | (65) | 41.1 | ||||||||||||
| 60 | 12.7 | (65) | 25.2 | 70 | 43.6 | ||||||||||||||
| 70 | 26.8 | (75) | 46.1 | ||||||||||||||||
| (75) | 28.3 | 80 | 48.6 | ||||||||||||||||
| 80 | 29.8 | ||||||||||||||||||
注：
1. l小于或等于带*号的螺钉，制出全螺纹。
2.表列规格为商品规格。尽可能不采用括号内的规格。
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