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Cap head screws of various sizes Button head screws Hex keys are best known as " Allen keys" or "Allen wrenches" in English-speaking countries like the UK, Australia, Canada and the U.S. and in Spanish-speaking countries such as Spain and Mexico (The "Allen" name is a registered trademark, originated by the Allen Manufacturing Company of ...
Inch-sized wood screws in the U.S. are defined by ANSI-B18.6.1-1981(R2003), while in Germany they are defined by DIN 95 (Slotted raised countersunk (oval) head wood screws), DIN 96 (Slotted round head wood screws), and DIN 97 (Slotted countersunk (flat) head wood screws). Security head screw: These screws are used for security purposes and ...
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
Where a fastener forms its own thread in the component being fastened, it is called a screw. [3] This is most obviously so when the thread is tapered (i.e. traditional wood screws), precluding the use of a nut, [3] or when a sheet metal screw or other thread-forming screw is used. A screw must always be turned to assemble the joint.
Flat head A screw with a flat head that requires countersinking so that it can be driven with the head flush with the surface it is screwed into. The angle of the screw is measured as the aperture of the cone. Oval or raised head A decorative screw head with a countersunk bottom and rounded top. [40] Also known as "raised countersunk" or ...
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profiles of screw heads: (a) pan, (b) dome or button, (c) round, (d) truss or mushroom, (e) flat or countersunk, (f) oval or raised head: Date: 24 July 2007, 13:54: Source: Screw head types.png originally created by Wapcaplet and released under a GFDL license: Author: Vectorized version by of Sakurambo: Permission (Reusing this file)