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CHAPTER THREADED FASTENERS 16.0 TABLE OF CONTENTS 16.1 INTRODUCTION 1 16.1.1 Externally Threaded Fasteners 2 16.1.2 Internally Threaded Fasteners 2 16.1.3 Locking Mechanisms 2 16.1.4 Threads 3 16.2 FAILURE MODES 4 16.2.1 Hydrogen Embrittlement 4 16.2.2 Fatigue 5 16.2.3 Temperature 5 16.2.4 Load and Torque 5 16.2.5 Bolt and Nut Compatibility 6 16.2.6 Vibration 7 16.3 STRESS-STRENGTH MODEL DEVELOPMENT 7 16.3.1 Static Preload 7 16.3.2 Temperature Effects of Fasteners in Clamped Joints 8 16.3.3 Corrosion Considerations 10 16.3.4 Dynamic Loading 12 16.3.5 Determination of Base Failure Rate 13 16.4 FAILURE RATE MODEL 13 16.4.1 Size Multiplying Factor 14 16.4.2 Alternate Loading Multiplying Factor 14 16.4.3 Temperature Multiplying Factor 15 16.4.4 Cyclic Shock/Impact Loading Multiplying Factor 15 16.4.5 Thread Correction Multiplying Factor 15 16.5 REFERENCES 21 16.1 INTRODUCTION Methods of fastening or joining components include bolting, brazing, soldering, and bonding with adhesives. One advantage of threaded fasteners is that they permit disassembly of the equipment for maintenance and repair. Threaded fasteners also allow the use of automated as well as standard manual tools for assembly and installation procedures enhancing operational reliability. The reliability of threaded fasteners in a given operating environment depends on the strength of materials, Threaded Fasteners 16-1 Revision B

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