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Threads, Fasteners & Springs

Threads, Fasteners & Springs. Use of Screw Threads. To hold parts together To adjust parts with reference to each other To transmit power. Screw Thread Terms. Important Terms.

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Threads, Fasteners & Springs

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  1. Threads, Fasteners & Springs

  2. Use of Screw Threads • To hold parts together • To adjust parts with reference to each other • To transmit power

  3. Screw Thread Terms

  4. 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.

  5. Screw Thread Forms

  6. Thread Pitch

  7. Right Hand & Left Hand Threads

  8. Single & Multiple Threads

  9. Thread Symbols There are three methods of representing screw threads on drawings: • Detailed • Simplified • Schematic

  10. Detailed Thread Symbols

  11. Simplified Thread Symbols(External Threads)

  12. Schematic Thread Symbols(External Threads)

  13. Simplified Thread Symbols(Internal Threads)

  14. Schematic Thread Symbols(Internal Threads)

  15. Threads in Section

  16. Notes in Threads

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