T40 X 5/16" HEX INSERT BIT

Apex® 5/16'' hex insert drive Torx ® bits from Apex® Fastener Tools, formally Cooper Tools. Torx ® fasteners are becoming extremely common in automotive repair and appliance assembly. By design, Torx ® head screws resist cam-out better than Phillips ® head or Slotted head screws. Where Phillips ® heads were designed to cause the driver to cam-out, to prevent over tightening, Torx ® heads were designed to prevent cam-out. The reason for this was the development of better torque-limiting automatic screwdrivers for use in factories.

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