钻一个洞，是在中央，这是一个心轴螺栓，使其余的加工操作可以执行。

A hole is drilled in the center and it is bolted to a mandrel so that the rest of the machining operations can be performed.

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再用压力机将其压平，再用车床进行加工水线、倒角等工艺，最后是用分度盘配合钻孔机进行螺栓孔的打孔的加工。

Then press the flattened, and then lathe processing waterline, chamfering process, finally with indexing disc with a drilling machine processing of bolt hole drilling.

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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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