In a rolling process, the roll separating force can be decreased by

Hot die steel, used for large solid dies in drop forging, should necessarily have

Cold shut (lap) may occur in products obtained by:

A small bore is designated as $$25H7.$$ The lower (minimum) and upper (maximum) limits of the bore are $$25.000mm$$ and $$25.021$$ respectively. When the bore is designated as $$25H8,$$ then the upper limit is $$25.033mm.$$ When the bore is designated as $$25H6,$$ then the upper limit of the bore in $$mm$$ is