Star shaped screw online, Thumb Screw Star Screw Star Nut Star Head Screw M6 x 40 mm Thread Clamp Knob Black Plastic Handknob Star Shaped Screw on Button for Machine online ...

Fed rod stock by a machine operator, the machine worked on a single screw at a time, passing the stock through a succession of different cutting tools. The earliest machines produced minute screws to ...