What is the taper of BT40 tool holder?

August 23, 2019

BT40 tool shank taper: diameter 63 mm tolerance is - 0.05 to 0; trapezoidal groove bottom diameter 53 mm; trapezoidal groove top width 10 mm tolerance is 0 to + 0.1; trapezoidal groove angle is up and down 30 degrees tolerance is - 15'to 0; trapezoidal groove center to spindle end face (tool shank cone big end point) distance is 16.6 mm tolerance is positive and negative 0.1. There are several national standards for tool holders of machining centers. 7:24 taper tool holders usually have five standards and specifications, namely NT (traditional type), DIN 69871 (German standard), IS0 7388/1 (international standard), MAS BT (Japanese standard) and ANSI/ASME (American standard).

BT is a Japanese standard (MAS403), taper is 7:24, size specifications are 30, 40, 50, 60. The BT40 handle "40" represents the taper cross section diameter of the handle. In order to achieve automatic tool change, 7; 24 is like a golden split point with one axis, and the tool handle has good versatility. It is the crystallization of the practice and theory of academic research to be determined and not self-locking and to achieve benefits. The global standard, of course, is the same in China. Machine tools can be sold elsewhere. They are all the same handle specifications.

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