[机] screw head
... screw gearing 螺旋齿轮传动装置 screw head 螺钉头 screw jack 螺丝千斤顶 ...
Screw cap
... Screw 螺钉,旋紧 Screw cap 螺钉头 Screw driver 螺丝刀,改锥 ...
bolt heading machine
Screw head slotter ; screw head slotting machine ; screwnickingmachine
bar head