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BS 4235-1:1972
M00000228
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BS 4235-1:1972 Specification for metric keys and keyways. Parallel and taper keys
standard by BSI Group, 02/22/1972
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Parallel and taper keys and keyways for shafts of 6 mm to 500 mm diameter. For square and rectangular parallel keys three classes of fit, 'free', 'normal' and 'close', are foreseen.Cross References:
BS 46:Part 1
BS 970:Part 1
BS 4500:Part 1