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ASME B5.50 2009 Edition, December 11, 2009
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7/24 Taper Tool to Spindle Connection for Automatic Tool Change
Additional Comments: 2015 EDITION UNDER PUBLICATION NO DUE DATE AVAIL
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This Standard pertains to the standardization of basic toolholder shank, retention knob, and socket assemblies for numerically controlled machining centers with automatic tool changers. The requirements contained herein are intended to provide toolholder interchangeability between machining centers with automatic tool changers of various types. This Standard is the inch solution for basic toolholder shank, retention knob, and socket assemblies. This design specifies an interchangeable retention knob with a 45-deg clamping surface.

Section 2 of this Standard specifies the dimensions and tolerances of toolholder shanks having 7/24 tapers intended for automatic tool change. These are intended for use with the corresponding basic retention knob and spindle sockets specified in sections 3 and 4 (see Table 1).

Section 3 contains information for standardization of retention knobs for use with the 7/24 connection system described herein (see Table 2).

Section 4 specifies the dimensions and tolerances of spindle sockets, drive keys, and key seats for machine tool spindles having 7/24 tapers intended for automatic tool change (see Table 3 and Fig. 1). These are intended for use with the corresponding basic toolholder shank and retention knob specified in sections 2 and 3.