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Self-Locking Threaded Fasteners

Self-Locking Threaded Fasteners. Burke Jardine Michael Johnson Matthew Dalebout. Objective. To understand how self-locking fasteners work, what they are used for and where to find them. Self-Locking Threaded Fasteners Outline. Conventional Nut vs Self-Locking Threaded Fasteners Comparison

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Self-Locking Threaded Fasteners

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  1. Self-Locking Threaded Fasteners Burke Jardine Michael Johnson Matthew Dalebout

  2. Objective To understand how self-locking fasteners work, what they are used for and where to find them.

  3. Self-Locking Threaded Fasteners Outline • Conventional Nut vs Self-Locking Threaded Fasteners Comparison • Advantages • Applications • Vendors and Where to Find Them

  4. Standard Nut vs Self Locking Threaded Fastener Comparison: • Standard Nuts • Self Locking Threaded Fasteners

  5. Standard Nuts • Standard Nuts: • Relies on friction • between the nut surfaces.

  6. Vibration Thermal Effects Fatigue Stress Distribution Strain Deformation Insufficient Tightening Torque Frequent Servicing/High Use Problems with Standard Nuts Accidental Disassembly Due to:

  7. What are self-locking fasteners? Self Locking Threaded FastenersPrevent Accidental Disassembly by: • Preventing Fatigue • Resisting Vibration • Reducing Stress Concentration

  8. Vibration After Pre-Load

  9. Types of Self-Locking Fasteners • Mechanical • Increase contact friction • Increase interference fit • Compression • Modified threads • Chemical • Anaerobic

  10. Why do self-locking work? Example : Stress Distribution

  11. Where Are They Found and Who Sells Them? ANY HARDWARE STORE Stores selling over the WWW

  12. Additional Information www.parker.com/stratoflex/products/locking.asp www.boltscience.com/pages/vibloose.htm www.longlok.com www.jlanfranco.com/jl_products.php

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