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Home>BS 1157:1975

BS 1157:1975

BS 1157:1975

BS 1157:1975

Recommendations for tapping drill sizes for use with fluted taps

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Sizes for ISO internal metric threads to BS 3643 (Parts 1, 2 and 3) and for internal threads to BS 21, 84, 93, 1580 (Parts 1, 2 and 3) and 2779. Alternative sizes in appendix.

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