METRIC FASTENER OVERVIEW.

″Metric Fastener Overview″ explains some rationale for going metric in North America by describing activities of the ANSI sponsored special study to develop an Optimum Metric Fastener System and the results to date. Discussed are: fastener significance, diameter/pitch recommendations, thread forms, thread gaging, bolt head design, materials, metric identification, nut design, small screws, rivets, clearance holes, pipe threads, inspection and quality assurance, availability and selection, and potential value of a planned, coordinated changeover to using metric standards.