1.1 This standard gives a simplified set of rules for the precise conversion of dimensions from inches to millimetres and vice versa to ensure interchangeability. The rules are meant for use particularly in the work of engineers, designers, draughtsmen and shop-workers.
1.1.1 The following categories of dimensions are covered:
a) Simple Feature Dimensions
b) Positional Dimensions
c) Datum Dimensions
d) Untoleranced Dimensions
e) Standard Feature Dimensions
IS 1105-1957 history
1957IS 1105-1957 A way to accurately convert imperial and metric dimensions to ensure interchangeability