A pocket floor is called out Ra 0.4 and the rest of the part is ordinary machining. Hitting 0.4 on that floor means a grind or a very careful finish and a measurement. The buyer says 'your mill should do that.'
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Quote a defined process. An ordinary end mill floor is not an Ra 0.4 promise. If they need 0.4, price the extra finish pass, the inserts, and a real measurement, or price a grind.
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Ask whether 0.4 is a function or a copy-paste from a title block. Buyers often relax it when they see the cost. Get the relaxation in writing.
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Do not nod and then hand-polish unpaid. The title block is part of the contract if you did not take exception.
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