21 内六角花形沉头螺钉GB/T 2673—1986标准
内六角花形沉头螺钉GB2673—1986标准
国标原文档下载：
内六角花形沉头螺钉尺寸规格、质量见表4.2-49、表4.2-50。
表4.2-49 内六角花形沉头螺钉的尺寸规格（mm)
| 螺纹规格d (6 g) | M6 | M8 | M10 | M12 | (M14) | M16 | M20 | |
| a max | 2 | 2.5 | 3 | 3.5 | 4 | 4 | 5 | |
| b min | 38 | 38 | 38 | 48 | 48 | 48 | 48 | |
| dk max | 11.3 | 15.8 | 18.3 | 22 | 25.5 | 29 | 36 | |
| K max | 3.3 | 4.65 | 5 | 6 | 7 | 8 | 10 | |
| 六角花形 | 代号 | T30 | T40 | T50 | T55 | T55 | T60 | T80 |
| t min | 1.4 | 2.1 | 2.3 | 3.02 | 3.22 | 3.62 | 5.42 | |
| B max | 4.15 | 5 | 6.62 | 8.2 | 8.2 | 9.8 | 13 | |
| l① 商品规格范围 | 8〜60 | 10〜80 | 12〜80 | 20〜80 | 25~80 | 35〜80 | ||
①公称长度系列为：8-16(2进级）、20-60(5进级）、70、80 mm。
表4.2-50 内六角花形沉头螺钉的质量（kg)
每1000件钢制品的大约质量
| l | G | l | G | l | G | l | G | l | G | l | G | l | G |
| M6 | M8 | M10 | M12 | (M14) | M16 | M20 | |||||||
| 8 | 1.75 | 10 | 4.57 | 12 | 7.47 | 20 | 16.89 | 25 | 29.68 | 25 | 39.72 | 35 | 81.98 |
| 10 | 2.1 | 12 | 5.19 | (14) | 8.45 | 25 | 20.45 | 30 | 34.56 | 30 | 46.26 | 40 | 92.22 |
| 12 | 2.44 | (14) | 5.81 | 16 | 9.44 | 30 | 24.01 | 35 | 39.43 | 35 | 52.8 | 45 | 102.5 |
| (14) | 2.78 | 16 | 6.43 | 20 | 11.4 | 35 | 27.57 | 40 | 44.31 | 40 | 59.34 | 50 | 112.7 |
| 16 | 3.12 | 20 | 7.68 | 25 | 13.86 | 40 | 31.14 | 45 | 49.18 | 45 | 65.89 | (55)* | 122.9 |
| 20 | 3.81 | 25 | 9.23 | 30 | 16.31 | 45 | 34.7 | 50 | 54.06 | 50 | 72.43 | 60 | 133.2 |
| 25 | 4.67 | 30 | 10.79 | 35 | 18.77 | 50 | 38.26 | (55)* | 58.93 | (55)* | 78.97 | 70 | 153.7 |
| 30 | 5.52 | 35 | 12.34 | 40 | 21.22 | (55)* | 41.82 | 60 | 63.8 | 60 | 85.51 | 80 | 174.1 |
| 35 | 6.38 | 40 | 13.9 | 45* | 23.68 | 60 | 45.38 | 70 | 73.55 | 70 | 98.6 | ||
| 40 | 7.24 | 45* | 15.45 | 50 | 26.13 | 70 | 52.51 | 80 | 83.3 | 80 | 111.7 | ||
| 45* | 8.1 | 50 | 17.01 | (55) | 28.59 | 80 | 59.63 | ||||||
| 50 | 8.95 | (55) | 18.56 | 60 | 31.05 | ||||||||
| (55) | 9.81 | 60 | 20.12 | 70 | 35.96 | ||||||||
| 60 | 10.67 | 70 | 23.23 | 80 | 40.87 | ||||||||
| 80 | 26.34 | ||||||||||||
注：1. l小于或等于带*号的螺钉，制出全螺纹，b=l-(k+a)。
2.表列规格为商品规格范围。尽可能不采用括号内的规格。