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BS 1157:1975

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Recommendations for tapping drill sizes for use with fluted taps

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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Pages: 28

Related Information

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  • BS 122-4:1980

    Milling cutters, Screwed shank end mills and slot drills

  • BS 1937:1953

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  • BS 1978:1965

    Specification for bit braces

  • BS 2054:1953

    Specification for augers and auger bits

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BS 1157:1975

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