History of the Robertson Screwdriver

History of the Robertson Screwdriver slot robertson screw HARDWARE MSR-004100 4-40 1 ROBERTSON-SLOT BOLT SCREW 100PACK HARDWARE MSR-004100 4-40 1 ROBERTSON-SLOT BOLT SCREW 100 Larger Photo slot iceland bear png In 1908, Canadian Peter Robertson invented a square-head screw drive where the driver and the hole had a slight taper There had been other

slot iceland bear png This zinc-plated, round head machine screw has a squareslot drive and a size three driver It is 12-24 x 12 inch and available in a box of 100

slot games for android phones His specially designed square socket screws and the driver gave a tighter grip than any usual slot and rarely slipped Robertson worked hard The Robertson Screwdriver set includes four square screwdrivers with 2-component handles for comfort All of the tips are colour-coded