hexagonal screw

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• Screw-pile lighthouse — Screw pile lighthouses stand on piles that are screwed into sandy or muddy sea or river bottoms. The first screw pile lighthouse was built by blind Irish engineer Alexander Mitchell. It was constructed in 1838 at the mouth of the Thames and was… …   Wikipedia

• Screw — This article is about the fastener. For other uses, see Screw (disambiguation). Screws come in a variety of shapes and sizes for different purposes. U.S. quarter coin (diameter 24 mm) shown for scale. A screw, or bolt, is a type of fastener… …   Wikipedia

• screw — screwable, adj. screwer, n. screwless, adj. screwlike, adj. /skrooh/, n. 1. a metal fastener having a tapered shank with a helical thread, and topped with a slotted head, driven into wood or the like by rotating, esp. by means of a screwdriver. 2 …   Universalium

• List of screw drives — Contents 1 Common types 1.1 External types 1.1.1 Square 1.1.2 Hex …   Wikipedia

• Allen screw — n. propr. a screw with a hexagonal socket in the head. * * * noun a screw with a hexagonal hole in the head • Hypernyms: ↑screw * * * ˈalə̇n noun Etymology: from Allen, a proper name : a screw with a hexagonal recess in the head * * * a screw… …   Useful english dictionary

• lag screw — noun a heavy woodscrew with a square or hexagonal head that is driven in with a wrench • Syn: ↑lag bolt • Hypernyms: ↑woodscrew * * * noun Etymology: lag (VI); from its original use in securing lags to drums or cylinders : a …   Useful english dictionary

• socket head screw — noun : a screw having a recess or socket to fit a wrench for turning rather than a slot or external hexagonal or square shape * * * socket head screw noun A screw with a hexagonal recess in its head, turned by means of a hexagonal bar formed into …   Useful english dictionary

• Bleed screw — A bleed screw is a device used to create a temporary opening in an otherwise closed system, which facilitates the removal of air or another substance from the system by way of pressure and density differences.On a home radiator unit, the bleed… …   Wikipedia

• cap screw — noun a threaded screw for machine parts; screws into a tapped hole • Hypernyms: ↑screw * * * noun : tap bolt * * * a fastener for machine parts, threaded along the whole length of its shank and held by threads tapped in the hole in which it is… …   Useful english dictionary

• lag screw — a heavy wood screw having a square or hexagonal head driven by a wrench. Also called coach screw, lag bolt. See illus. under screw. [1870 75] * * * …   Universalium

• Al|len screw — «AL uhn», a screw having a hexagonal socket sunk in its head, and threaded to the top, used as a set screw or plug …   Useful english dictionary