December 03, 2001 Burke Jardine Michael Johnson Matthew Dalebout Self-Locking Threaded Fasteners
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 Advantages Applications Vendors and Where to Find Them
Standard Nut vs Self Locking Threaded Fastener Comparison: Standard Nuts Self Locking Threaded Fasteners
Standard Nuts Standard Nuts: Relies on friction between the nut surfaces.
Problems with Standard Nuts Vibration Thermal Effects Fatigue Stress Distribution Strain Deformation Insufficient Tightening Torque Frequent Servicing/High Use Accidental Disassembly Due to :
What are self-locking fasteners? Self Locking Threaded Fasteners Prevent Accidental Disassembly by: Preventing Fatigue Resisting Vibration Reducing Stress Concentration
Vibration After Pre-Load
Types of Self-Locking Fasteners Mechanical oIncrease contact friction oIncrease interference fit Compression Modified threads Chemical oAnaerobic
Why do self-locking work? Example : Stress Distribution
Where Are They Found and Who Sells Them? ANY HARDWARE STORE Stores selling over the WWW
Additional Information ing.asp