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2 保证扭矩等级与保证扭矩值
蝶形螺母的保证扭矩等级由一位罗马数字组成，仅为代号，而无等级高低之分。适用于国家标准规定的蝶形螺母产品。
蝶形螺母的保证扭矩按表1规定。在常温下按第4章规定的方法进行试验时，蝶形螺母的螺纹不应脱扣或断裂，翼部亦不应有明显变形；当去除扭矩后，应能用手将螺母旋出，或借助扳手松开螺母，但不得超过半扣。试验中，如螺栓损坏，则试验作废。
表1 保证扭矩（单位：牛米）
螺纹规格 | 保证扭矩等级 | ||
Ⅰ | Ⅱ | Ⅲ | |
M2 | 0.20 | 0.15 | — |
M2.5 | 0.39 | 0.29 | — |
M3 | 0.69 | 0.49 | 0.29 |
M4 | 1.57 | 1.08 | 0.59 |
M5 | 3.14 | 2.16 | 1.08 |
M6 | 5.39 | 3.92 | 1.96 |
M8 | 12.7 | 8.83 | 4.41 |
M10 | 25.5 | 17.7 | 8.83 |
M12 | 45.1 | 31.4 | — |
M14 | 71.6 | 50.0 | — |
M16 | 113 | 78.5 | — |
M18 | 157 | 108 | — |
M20 | 216 | 147 | — |
M22 | 294 | 206 | — |
M24 | 382 | 265 | — |
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