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John N. Petre (1891-1952) held six patents assigned to Park Metalware. Among his important inventions was the interchangeable shaft screwdriver U.S. patent 2,476,762. By 1952, the Xcelite brand name was so well known in the electronics, television and radio repair industries, the company changed its corporate name to Xcelite, Inc. [4]
A pentagon screw drive uses five-sided fastener heads, and the fastener is known as a penta screw or penta bolt. It is designed to be intrinsically incompatible with many tools. Since five is an odd number, it cannot be turned by open-end or adjustable wrenches, which have parallel faces (and thus require a fastener with an even number of sides).
A typical simple screwdriver has a handle and a shaft, ending in a tip the user puts into the screw head before turning the handle. This form of the screwdriver has been replaced in many workplaces and homes with a more modern and versatile tool, a power drill, as they are quicker, easier, and can also drill holes. The shaft is usually made of ...
The L. S. Starrett Company is an American manufacturer of tools and instruments used by machinists, tool and die makers, and the construction industry. The company was founded by businessman and inventor Laroy Sunderland Starrett in 1880. The company patented such items as the sliding combination square, bench vises, and a shoe hook fastener.
A security Torx L-key and fastener with holes for a safety pin to hinder disassembly with an ordinary Torx key. A Torx T8 screw head on a hard disk drive.. Torx (pronounced / t ɔːr k s /) is a trademark for a type of screw drive characterized by a 6-point star-shaped pattern, developed in 1967 [1] by Camcar Textron.
The #6-32 UNC screw has a thread pitch of 1/32 in (0.031250 inches (0.7938 mm)).. The #6-32 UNC is a UTS screw specifying a major thread diameter of #6 which is defined as 0.1380 inches (3.51 mm); and 32 tpi (threads per inch) which equates to a thread pitch of 0.031250 inches (0.7938 mm).