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A socket cap screw, also known as a socket head capscrew, socket screw, or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole. The term socket head capscrew typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times that of the screw shank ( major ) diameter, with a head height ...
An internal wrenching nut, (also known as an Allenut [1] or Allen nut), is a cylindrical nut that is internally threaded on one side and has an Allen socket on the other side; the outside of the nut is smooth or has knurling on it. The Allen socket may be 6 point or 12 point (also known as a double hex socket). They are used where hex or square ...
The carriage bolt is used extensively in security applications, such as locks and hinges, where the bolt must be removable from one side only. The smooth, domed head and square nut below prevent the carriage bolt from being gripped and rotated from the insecure side.
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.
Oval or raised head A decorative screw head with a countersunk bottom and rounded top. [40] Also known as "raised countersunk" or "instrument head" in the UK. [citation needed] Bugle head Similar to countersunk, but there is a smooth progression from the shank to the angle of the head, similar to the bell of a bugle. Cheese head Cylindrical ...
Insert nut: Threaded socket A threaded socket for a wooden workpiece, similar to a wall anchor. Knurled nut: Thumb nut Has a knurled outside surface which facilitates tightening by hand (thumb nut) or secures the nut into a handle or cover (insertion nut) Sex bolt: Barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or ...
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