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Fastener

Exploration and Descriptions of the Various Fastener Types
by

Barry Hendrix

on 30 January 2013

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Transcript of Fastener

UNIFIED SCREW THREAD CHART THREAD FORMS •UNC Unified National Coarse
•UNF Unified National Fine
•UNS Unified National Special Screw Threads and Fasteners Thread Terminology CLASSES OF THREAD FITS METRIC THREADS M10 X 1.5-6g THREAD FASTENER IDENTIFICATION A bolt is an externally threaded fastener that is inserted through holes in an assembly and tightened with a nut Fastener Basics TURN OF THE SCREW Angle of Thread
Major Diameter
Minor Diameter
Number of Threads
Pitch
Crest
Root
Lead ¼-20-UNC ¼-28-UNF 1/4" Major Diameter 28 Threads
per Inch 20 Threads
per Inch Unified thread fits are classified as lA, 2A, 3A ... or 1B, 2B, 3B A indicates an external thread B indicates an internal thread The numbers indicate the class of fit The tighter the fit the closer the tolerance of the sizes of the thread... and the more expensive to purchase 1/4-20 UNC 2A Thread form Thread fit A screw is an externally threaded fastener that is inserted into a threaded hole and is tightened by turning the head Is this a screw or a bolt?
Depends on how it is used.
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