Обший каталог Yamawa 2016 - 2017 - страница 792

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Classes of Internal Threads and Classes of Cutting Taps Description of products 3. Oversize Class (1) Due to the material or shape of workpiece, the material can shrink. In these cases, it would be better to use oversized taps to compensate for shinkage after tapping. (2) When plating is to be applied to internal threads after threading, we should use oversized taps to compensate for the thickness amount of plating. (3) Where little tendency of oversize cutting is expected, but large wear in tools is expected during tapping operation, it is better to consider using oversized taps as much as possible. Due to above stated reasons (1) , (2) and (3), oversize classes “ISO 2X” and “2BX” have larger thread diameter than standard classes “ISO2” and “2B”. But as shown in drawings of P784-P787, those oversize classes are applicable to classes “6H” and “2B” of internal threads. Technical Information Technical-17 788