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Irwin was founded in 1885 in Martinsville, Ohio as the Irwin Auger Bit Company by Charles Irwin, a pharmacist. Irwin had bought the rights to a solid-center auger bit from a local blacksmith. [3] In 1924, another blacksmith, Danish immigrant William Petersen of DeWitt, Nebraska, invented the first locking pliers [4] and named them Vise-Grips. [5]
Square head cap screws up to and including 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 8 inch (3.175 mm) larger than the shank; screws larger than 3 ⁄ 4 inch (19.05 mm) have a head 1 ⁄ 4 inch (6.35 mm) larger than the shank. [9] In 1919, Dyke defined them as screws that are threaded all the way to the head. [10] socket screw
Upper row: F-clamp or bar clamp, one-handed bar clamp ("Quick Grip"), wooden handscrew; Lower row : spring clamp, C-clamp (G-clamp ), wooden cam clamp A clamp is a fastening device used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure .
A set screw is often headless and threaded along its entire length, so that it will sit entirely inside that hole; in which case it may be called a grub screw or blind screw. Once fully and firmly screwed into the first object, the projecting tip of the set screw presses hard against the second object, acting like a clamp .
A machine screw or bolt is usually a smaller fastener (less than 1 ⁄ 4 inch (6.35 mm) in diameter) threaded the entire length of its shank that usually has a recessed drive type (slotted, Phillips, etc.), usually intended to screw into a pre-formed thread, either a nut or a threaded (tapped) hole, unlike a wood or self-tapping screw. Machine ...
A common use for cage nuts is to mount equipment in square-holed 19-inch racks (the most common type), with 0.375 inches (9.5 mm) square-hole size. There are four common sizes: UNF 10–32 and, to a lesser extent, UNC 12–24 are generally used in the United States; elsewhere, M5 (5 mm outside diameter and 0.8 mm pitch) for light and medium equipment and M6 for heavier equipment, such as servers.
A C-clamp or G-clamp or G-cramp is a type of clamp device typically used to hold a wood or metal workpiece, and often used in, but are not limited to, carpentry and welding. . Often believed that these clamps are called "C" clamps because of their C-shaped frame, or also often called C-clamps or G-clamps [1] because including the screw part, they are shaped like an uppercase lette
The name lewis may come from the Latin levo -avi, -atum meaning to levitate or lift, [1] but the Oxford English Dictionary Online [2] states, "the formation and the phonology are not easily explained on this hypothesis", preferring "origin obscure", and speculating that the term may derive from a personal name.
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