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Learn about screw threads, their importance, terminology like pitch and lead, different thread forms, and symbolic representations in this detailed guide.
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Use of Screw Threads • To hold parts together • To adjust parts with reference to each other • To transmit power
Important Terms • PITCH:The distance from a point on a screw thread to a corresponding point on the next thread measured parallel to the axis. The pitch P is equal to 1 divided by the number of threads per inch. • LEAD: The distance a screw thread advances in one turn. • Thread Form: The cross section of thread cut by a plane containing the axis.
Thread Symbols There are three methods of representing screw threads on drawings: • Detailed • Simplified • Schematic