It is the surface of a thread that connects the crest with the root and also it offers the surface contact with its counterpart. It is the top portion of the surface of a thread, either flat or rounded which joins the sides of the same threads. It is the bottom portion of the surface of a thread, either flat or rounded which joins the sides of the adjacent threads. The internal thread cut on the inner surface of a hole. The various elements of a screw thread are shown in fig. The external thread is the thread cut on the outer surface of a rod. The Following definitions refer to the various term used in screw threads. Read also: Bearings and Types of bearing the complete guide Screw Thread Terminologyįollowing are the terms used screw thread terminology: To hold parts together as in the case of fastening.To control movement as in a micrometre.It increases the efficiency of the applied effort as in an auto-jack.
To convey materials as in a gravity conveyor.Threads are applied to many devices for various purposes some are as follows: In temporary fastenings, the parts are held together by fasteners such as screws, bolts, nuts keys, cotter, pins, etc. It is possible without injury or damage to the fastener or to the part. Temporary fastenings are those in which repeated assembly or disassembly. There are two types of fastening used in engineering practice: In all kinds of joining, the various parts are held together by devices known as fastening, and the elements by which the parts are so joined are called fasteners or fastening elements.
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