Need Help? Print Home Tools Power Tools Drill Bits Screwdriver Bits as drivers became more common, tamper-resistant variants, as described below, were developed.[4] Torx screws are also becoming increasingly popular in construction industries. Principles of operation The angle between the plane of contact between tool and fastener and the circumferentially-directed force is much closer to 90 degrees in the case of a Torx type of head than for a conventional hex head. By design, Torx head screws resist cam-out better than Phillips head or slot head screws. Where Phillips heads were designed to cause the driver to cam out, to prevent overtightening, 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. Rather than rely on the tool slipping out of the screw head when a torque level is reached, thereby risking damage to the driver tip, screw head and/or workpiece, the newer driver design achieves a desired torque consistently. The manufacturer claims this can increase tool bit life by.
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