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ISO 3294:1975 Parallel shank countersinks for angles 60, 90 and 120 degrees inclusive
standard by International Organization for Standardization, 07/01/1975
Specifies only metric dimensions of these countersinks. Metric dimensions being regarded as the only recommended dimensions in the future, for these countersinks with cutting diameters in the range 8 to 25 mm. The dimensions given apply only to tools made from high speed steel or a suitable carbon steel. These countersinks will be usually right-hand cutting.
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