Fasteners and Their Types...

Fasteners and Their Types Steel plants are associated with the fasteners in two ways. Firstly they supply steels of various qualities used in the manufacture of fasteners and secondly, they use various types of fasteners of different varieties, sizes and qualities in the equipments used in the steel plant. A fastener is a hardware device that mechanically joins or affixes two or more objects together. It is defined as a hardware which can be easily installed and removed with hand tool or power tool. Common fasteners include screws, bolts, nuts and rivets. The terms bolts and screws do not refer to specific types of fasteners, but rather how they are used (i.e. the application). Thus the same fastener may be termed a bolt or a screw. Bolts are defined as headed fasteners having external threads that meet an exacting, uniform thread specification such that they can accept a non-tapered nut. Screws are defined as headed, externally-threaded fasteners that do not mate with a non-tapered nut and are instead threaded into the material they hold. Principal purposes of the fasteners are (i) dis-assembly for inspection and repair, (ii) modular design, where a product consists of a number of sub-assemblies. The fastener types are (i) removable which permits the parts to be readily disconnected without damaging the fastener, e.g. nut and bolt, (ii) semi-permanent type where the parts can be disconnected, but some damage usually occurs to the fastener, e.g. cotter pin, and (iii) permanent type where the parts are never be disassembled e.g. rivets and welding of fasteners The most common types of male fasteners used in industry are hex head, slotted head, flat (or countersunk) head, round head, socket (or ‘allen’) head, button head and socket set screw. The most common types of female fasteners (i.e. nuts)...