"10.1.3 When the purchaser specifies flatness in accordance
with 10.3.1.3 or 10.3.1.4, overgage tolerances in excess of
those specified herein may be specified by the manufacturer."
where sections 10.3.1.3 and 4 pertain to machined flatness of the clad material.

The spec goes on to provide a table of under and overgage allowances for a range of thicknesses.

It seems that the over/undergage tolerance is an additional material allowance for machining.

Can someone verify or clarify this interpretation?