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Square Head Bolts are similar to Hex Cap screws but have a 4-sided square head instead of a 6-sided hexagonal head. They are commonly referred to as both bolts and screws and are designed to be driven with a wrench. Square Head Bolts are partially threaded with a shoulder beneath the head.
Flange bolts have hexagonal heads, designed to be driven by a wrench. The unique characteristic of a
flange bolt is the design of the head, from which they get their name. The "flange" of the bolt is a built
in (integral) washer. In Imperial sizes, this washer is serrated to act as a lock washer.
Flange bolts are available in both full thread and partial thread varieties. The threading depends upon
the lengths of the bolt. Partially threaded flange bolts have a shoulder, and fully threaded flange bolts
are threaded to the underside of the flanged head.
Either of two screws (both right-handed and turning together in the same direction or one right-handed and the other left-handed and turning oppositeways) by which an object which they adjust or restrain may be moved in one direction or the other by the motion of one. A common use is to allow the head of a countersunk bolt, screw or rivet, when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counter bore makes a flat-bottomed hole that might be used with a socket-head caps crew).
Slotted Csk head screws from TUFF Fasteners require its hole of insertion to be pre-drilled.
Allen (hex socket) drive is a six-sided recess for use with an allen wrench (hex key). Stainless steel 18-8
A stud is a threaded rod, it is threaded on both ends, the thread may extend along complete length of rod.
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