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BS 1660-7:1988 Machine tapers. Specification for extension adaptors with external 7/24 tapers for tools with Morse taper shanks
standard by BSI Group, 09/30/1988
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Specifies the dimensions and tolerances for adaptors (collets) for sizes 30, 40, 45, 50, 55 and 60 and Morse taper sizes 1 to 5.Cross References:
BS 1660:Part 1
BS 1660:Part 4