Transcription of Fastener Handout
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Fastener Handout Introduction: Engineering Design Representation 2 Threads 2 Effect of thread angle on strength: 3 Standardization of Threads: 4 Descriptions of the thread Series: 4 Class fit: 5 Specification of SAE/Metric Threads: 6 Local Notes (callouts) 8 Counterbore specification: 9 Countersink specification: 9 Writing notes for threaded holes: 10 Threaded Mechanical Fasteners 13 Examples of threaded hole notes 13 Clamping Force: 14 Cap Screws: 14 Machine Screws: 15 Set Screws: 15 Examples of Fastener specifications 16 Appendix A Fastener Head Dimension Tables 21 Appendix B Recommended Fastener Torques 28 Appendix C Bolt Grade Markings and Strength Chart 29 Appendix D Letter and Number Decimal Equivalents 31 2 Introduction: Engineering Design Representation Despite advances, 2D mechanical drawings are still the most popular format for design documentation.
Thread information is available in tabular form from many sources including Mechanical Drawing texts and Machine Design handbooks. Thread form: Thread form is a classification based upon the cross-sectional profile of the thread. The standard thread form for inch unit threads in U.S. is the Unified (UN) thread form. This
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