ISO 14581 沉头平圆头内梅花螺钉
内梅花按照ISO 10664标准执行
机械性能满足ISO 898-1:2013(E)
等级：4.8 、 8.8
头标：NE 04.8 / 08.8
原材料：10B21
Thread,d | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 |
| without shoulder | with shoulder | ||||||||
| pb | 0.40 | 0.45 | 0.50 | 0.60 | 0.70 | 0.80 | 1.00 | 1.25 | 1.50 |
| b min. | 25 | 25 | 25 | 38 | 38 | 38 | 38 | 38 | 38 |
| dkc theoretical max. | 4.4 | 5.5 | 6.3 | 8.2 | 9.4 | 10.4 | 12.6 | 17.3 | 20 |
| dkc actual max. | 3.8 | 4.7 | 5.5 | 7.3 | 8.4 | 9.3 | 11.3 | 15.8 | 18.3 |
| dkc actual min. | 3.5 | 4.4 | 5.2 | 6.94 | 8.04 | 8.94 | 10.87 | 15.37 | 17.78 |
| kc max. | 1.2 | 1.5 | 1.65 | 2.35 | 2.7 | 2.7 | 3.3 | 4.65 | 5 |
| r max. | 0.5 | 0.6 | 0.8 | 0.9 | 1 | 1.3 | 1.5 | 2 | 2.5 |
| x max. | 1 | 1.1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3.2 | 3.8 |
| Socket no. | 6 | 8 | 10 | 15 | 20 | 25 | 30 | 45 | 50 |
| A ref. | 1.75 | 2.4 | 2.8 | 3.35 | 3.95 | 4.5 | 5.6 | 7.95 | 8.95 |
| t max. | 0.64 | 0.79 | 0.83 | 1.32 | 1.53 | 1.51 | 1.78 | 2.54 | 2.8 |
| t min. | 0.51 | 0.66 | 0.7 | 1.16 | 1.14 | 1.12 | 1.39 | 2.15 | 2.41 |
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