... fillister head 圆顶平头 screw inserts 螺丝槽型 cross recessed drives 十字槽 ...
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Screw thread inserts 英文钢丝螺套
helicoil screw lock inserts 锁紧型螺纹丝套
Screw Lock Inserts 锁紧型螺纹丝套
screw-machine inserts 机制螺纹嵌件
screw inserts
螺杆插入
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Screwmakers add nylon inserts to keep fasteners tight, but this adds 7% to 10%to the cost of a screw.
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