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Cutting diameter tolerances: 1/32" through 31/64": +.0002", -.0000"; 1/2" through 19/32": +.0003", -.0000"; 5/8" through 1 1/2": +.0005", -.0001". . Fastener dimensions. The head style and type . The length required specified in inches, fractions of inches or millimeters.
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Cutting diameter tolerances: 1/32" through 31/64": +.0002", -.0000"; 1/2" through 19/32": +.0003", -.0000"; 5/8" through 1 1/2": +.0005", -.0001".
Fastener dimensions The head style and type. The length required specified in inches, fractions of inches or millimeters. The diameter - when measuring in inches for diameters less than 1/4" there is a gauge number, above that specify the diameter in fractions of an inch. For metric the diameter is specified in millimeters. The thread pitch - distance between threads or threads per inch. UNC, UNF and Metric define standard values. The material - brass, stainless steel, nylon etc.
http://www.americanfastener.com/technical/thread_terminology.asphttp://www.americanfastener.com/technical/thread_terminology.asp