丝锥为一种加工内螺纹的刀具，按照形状可以分为螺旋丝锥和直刃丝锥，按照使用环境可以分为手用丝锥和机用丝锥，按照规格可以分为公制，美制，和英制丝锥，按照产地可以分为进口丝锥和国产丝锥。丝锥是制造业操作者加工螺纹的*主要工具。一种加工内螺纹的刀具，沿轴向开有沟槽。也叫螺丝攻。丝锥根据其形状分为直槽丝锥,螺旋槽丝锥和螺尖丝锥。直槽丝锥加工容易，精度略低，产量较大。一般用于普通车床，钻床及攻丝机的螺纹加工用，切削速度较慢。
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不要用湿手开启门锁，或将腐蚀性溶剂溅到木门及门锁上。开启门锁或转动门锁把手时，不要用力过猛。合页、锁具是活动性配件，发生松动时应立即拧紧；合页位置发出响声时应及时注油以保持其运转顺畅；锁开启时如不灵活可往钥匙孔塞入适量的铅笔粉末，其中的石墨成分是很好的固体润滑剂，不可随便注油，以免粘附更多的灰尘造成锁孔堵塞。门体的缓冲装置只能在一定限度内抵抗撞击，避免大力倚靠门扇或悬吊在门把手上摇荡，不要在门板上钻孔安装挂件或悬挂重物，以免减少寿命。
