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Chinese Standard: GB/T 18685-2017

The blank diameters for rolling general purpose metric screw threads

全国螺纹标准化技术委员会(SAC/TC 108)

本标准规定了普通螺纹搓制和滚制前的毛坯直径尺寸。普通螺纹公称直径范围为1 mm~52 mm(第1、2系列直径;最大螺距为4 mm);螺纹公差带有4h、6h、6g、6f和6e五种。

本标准适用于全牙型挤压工艺加工碳素钢和合金钢材料的普通螺纹。

注: “全牙型挤压工艺”是指在螺纹挤压成形时,螺纹材料完全充满刀具牙底空间的加工方法。

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