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standard by International Organization for Standardization, 09/01/1998
This International Standard gives a series of cones or conical tapers, ranging from 120 to less than 1, or ratios from 1:0,289 to 1:500, intended for general use in mechanical engineering.
It applies only to plain conical surfaces, and excludes prismatic pieces, taper threads, bevel gears, etc.
The method of dimensioning and tolerancing conical surfaces on drawings is covered in ISO 3040.