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Pass-through sockets and ratchets are built for 1 ⁄ 4-inch, 3 ⁄ 8-inch and 1 ⁄ 2-inch sets in both SAE and metric sizes. By using a fine tooth ratchet and socket system that allow a pass-through ratchet to be used as a conventional ratchet handle with interchangeable 1 ⁄ 4-inch and 3 ⁄ 8-inch drives some ratchets can be used with ...
A security Torx screw drive is a common modification to socket and cruciform style drives to make the fastener more tamper resistant by inserting a pin in the center of the female socket, requiring a tool with a corresponding hole to drive the fastener. This can also prevent attempts at turning the screw with a small flat-bladed screwdriver.
The idea of a hex socket screw drive was probably conceived as early as the 1860s to the 1890s, but such screws were probably not manufactured until around 1910. Rybczynski (2000) describes a flurry of patents for alternative drive types in the 1860s to the 1890s in the U.S., [2] which are confirmed to include internal-wrenching square and triangle types (that is, square and triangular sockets ...
The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
A spinner handle is a shaft and handle with a drive fitting—most commonly 1 ⁄ 4 in (6.35 mm) square axle at the end for attaching interchangeable sockets. This allows one to use a single handle with a number of sizes instead of having a separate nut driver for each size.
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