Accupro ECIL581000MSC Taper Drill Chuck Arbor JT1

Product Description

The ACCUPRO ECIL581000MSC is a taper drill chuck arbor designed to connect a Jacobs Taper No. 1 (JT1) drill chuck to a machine spindle with a straight shank interface. The arbor features a 5/8-inch straight shank diameter and a shank length of 2.5 inches, providing a secure, concentric mount between the chuck and the machine. This type of arbor is a standard component in drill press and milling machine setups where a JT1-mount chuck must be seated to a straight-shank spindle or collet holder. Toolroom machinists and machine maintenance technicians are the typical installers.

This arbor is suited for use on drill presses, milling machines, and similar machine tools that accept a straight 5/8-inch shank and require a JT1 Jacobs Taper chuck mount. It is appropriate for both light industrial and production shop environments where quick chuck changes and repeatable runout are required. The JT1 taper mount provides positive mechanical seating when the chuck is driven onto the arbor, eliminating the need for threaded fasteners at the chuck-to-arbor interface.

Key Features

• JT1 Jacobs Taper mount for positive, interference-fit chuck seating
• 5/8-inch straight shank diameter for compatibility with standard spindle collets and chucks
• 2.5-inch shank length provides adequate engagement depth in the spindle
• Compact and lightweight at 0.26 pounds for minimal added spindle load
• Straight shank type allows use in a wide range of machine tool spindles

Compatibility

Designed as an OEM-style replacement or standard fitment arbor for drill press and milling machine spindles accepting a 5/8-inch straight shank, paired with any drill chuck featuring a JT1 Jacobs Taper mount bore.

Installation Notes

Installation is performed by qualified toolroom or maintenance technicians. Power down and lock out the machine at the main disconnect before handling spindle tooling. The JT1 taper is an interference fit — seat the chuck onto the arbor taper using a controlled press or mallet strike to the chuck body, not the arbor shank. Inspect the taper surfaces for burrs or contamination before assembly, as surface defects will compromise runout and holding force.