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Countersinking Allen screws, bit angle for metic different to unified??
I seem to remember being taught in school that metric countersunk Allen
srews had a 90 degree countersink angle, and Unified had an 82 degree angle. Is that right, and does it matter if I just use a 90 degree countersinking bit for both, as here in the UK no one seems to stock 82 degree bits for ferrous material? Thanks. |
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