BSI - BS 869
Specification for Toolmakers' Flats and High Precision Surface Plates
|Publication Date:||31 January 1978|
|ICS Code (Measuring instruments):||17.040.30|
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.