Parts with threads used for joining and fastening are called screw fasteners. The most widely used components as screw fasteners are bolts, double screw bolts, screws, nuts, washers.
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产品包括：螺栓、螺钉、螺柱、U型螺栓、预装配的螺钉和垫片组件以及与预装配组件一样加工的无垫圈产品。
Products included are bolts, screws, studs, U-bolts, preassembled screw and washer assemblies (sems), and products manufactured the same as sems except without washer.
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紧固件的表面不连续性。第1部分：一般要求的螺栓，螺钉，螺柱。
Fasteners surface discontinuities; part 1: bolts, screws and studs for general requirements.
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