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BS 1157:1975 (R2012)
Recommendations for tapping drill sizes for use with fluted taps
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Summary
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.
Technical characteristics
| Publisher | British Standards Institution (BSI) |
| Publication Date | 09/30/1975 |
| Confirmation Date | 01/01/2012 |
| Page Count | 28 |
| Themes | British Association screw threads |
| EAN | --- |
| ISBN | --- |
| Weight (in grams) | --- |
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Previous versions
30/09/1975
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, Reaffirmed
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