This Standard pertains to the standardization of a basic tool holder shank and retention knob for numerically controlled machining centers with automatic tool changers. The requirements contained herein are intended to provide tool holder interchangeability between machining centers with automatic tool changers of various types. Dimensions for cone angle control are in accordance with the International Standard ISO-1947.

This Standard is the inch solution for a tool holder shank and retention knob assembly. This design specifies an interchangeable retention knob that utilizes a 45 deg. Knob head angle to cooperate with a flexible retention device.