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ISO 4204:1977 Countersinks, 90 degrees, with Morse taper shanks and detachable pilots
standard by International Organization for Standardization, 02/01/1977
This International Standard specifies the dimensions of 90 countersinks with Morse taper shanks and detachable pilots for general use.
The illustration is diagrammatic only and is not intended to indicate details of design.
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