78th Edition, January 31, 1978
Specification for Toolmakers' Flats and High Precision Surface Plates
Includes all amendments and changes through Reaffirmation Notice , February 1, 2012
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Description / Abstract:
Circular hardened steel or granite toolmakers' flats up to 200 mm diameter and circular cast iron or granite high precision surface plates 250 and 400 mm diameter. Material, general design, finish, accuracy, cases, packing and marking. Composition of typical steels, cast irons and heat treatment.