常用螺丝种类A: Machine Screw: 机械螺丝螺丝B: Tapping Screw:自攻螺丝（分使用于金属与使用于塑料二种）B-1: Sheet Metal Tapping Screw. （铁板牙自攻螺丝）B-2: Plastic Tapping Screw. (塑料用，m8自攻螺丝，自攻螺丝）C: Wooden Screw : 木工螺丝D: Drywall Screw :水泥墙螺丝E:
