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| ①,长度 L 小于等于螺纹长度 b 加上无螺纹距离 S 的斜头螺栓,应全螺纹。从头部承载面(在头部中部高度处测量)到螺纹最后一条划痕的距离不得超过S。从头部承载面(在头部中部高度处测量)到第一条完整(全形)螺纹的距离(使用非倒角的 GO 螺纹环规手动装配至螺纹允许的最大位置进行测量)不得超过 S 加上 2.5倍螺距 的长度。 ②,螺纹系列:四方斜头螺栓仅提供统一粗牙 (UNC) 螺纹。 ③,螺纹公称长度b为参考尺寸,仅用于计算。当螺栓公称长度 L ≤ 6 in 时,b=2d+0.25;当L>6in时,b=2d+0.5 。 |
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