ROBERTSON Machine Screw 8-32 X 78 Truss Head Combination

A Robertson screw, also known as a square screw or Scrulox, is a type of screw with a square-shaped socket in the screw head and a corresponding square

But if you've ever cammed a screw-head slot, you know why it's not the only design The official history from the Robertson Screw

slot games pg company direct website His specially designed square socket screws and the driver gave a tighter grip than any usual slot and rarely slipped Robertson worked hard

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