Jacobs A0404 Morse Taper Arbor No 4 Jacobs Taper

Jacobs A0404 Morse Taper Arbor converts a Morse Taper No. 4 spindle to a Jacobs Taper No. 4 chuck interface, with MT4 on one end and JT4 (Jacobs Taper No. 4) on the other. It is used to mount a Jacobs chuck (JT4) onto machines with MT4 spindles, enabling direct chucking without altering spindle geometry. The model is identified as A0404 (A58 appears in related listings), and it supports No. 4 Jacobs chucks paired with MT4 spindles. This adapter is common in drill presses and other small to mid-size machine tools where a JT4-to-MT4 connection is required for quick tool changes and versatile drilling or light milling operations.