Re: Recommendation for tap fit hole tolerance in 4140 pre-hard steel

Your fit will depend also on how you machine the bores - i.e. the
finish. Bored, reamed, honed, burnished? A roughly bored finish with
little interference might give you a light press fit, whereas a bore
burnished to the same size might be a heavy press or shrink fit.

There's always Loctite.....

John Martin
.

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