pk10牛牛注册开户自攻牙的螺丝钉和机械牙的螺丝
栏目:机械螺丝 发布时间:2019-10-09 20:34
也可直接点“搜索资料”搜索整个问题   自攻螺钉的直径由端部到正常直径位置是渐变的,而普通螺钉的直径是不变的(除了端部有一个小倒角)   两者的牙型角不相同,普通螺钉的牙型角是60°,而自攻螺钉的牙型角小于60°

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