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No Turn of the Screw

2002; ASM International; Volume: 124; Issue: 12 Linguagem: Inglês

10.1115/1.2002-dec-5

1943-5649

Paul Sharke,

Metal Alloys Wear and Properties

This article reviews about Torx fasteners that are not that easy to remove and needs better access for the removal. There had been no way to fit any other tool but a screwdriver through the hole by which he had originally tried to unscrew the fastener. Better access means that to remove the tilt wheel assembly, a job involving pressed pins and more special tools. Torx fasteners were originated in the late 1960s,when the Camcar division of Textron, developed their design to overcome some of the limitations of other screw styles. The Torx design resisted cam-out better than did Phillips screws. It also reduced the drive angle to 15° from the high 60° angle of hexagonal socket head screws or the still higher 90° angle of the square socket, or Robertson, screw. The new Textron design also relies on a vertical sidewall as a way of increasing a drive bit’s engagement.