Jacobs JCM31038 Keyless Drill Chuck 1/2 in Threaded 1/2-20

Product Description

The JACOBS JCM31038 is a keyless drill chuck designed for threaded-mount installation on drilling equipment. It accepts bit shanks from 1/16 inch up to 1/2 inch, covering the full range of standard twist drills, step bits, and driving accessories used in trade and production applications. The plain bearing design keeps the chuck compact and easy to service. With a closed length of 2.9 inches and a sleeve diameter of 1.68 inches, this chuck fits standard drill press and portable drill spindle configurations using a 1/2-20 threaded mount. The steel construction handles the torque and vibration loads typical of daily trade use.

This chuck is suited for use on drill presses, portable electric drills, and similar rotating tools where a 1/2-20 threaded spindle is present. The keyless design allows bit changes without a separate chuck key, which speeds workflow on job sites and in shop environments. It is appropriate for residential and light commercial applications in HVAC, plumbing, electrical, and general mechanical trade work where repeated bit changes and reliable concentricity are required.

Key Features

• Keyless operation - no chuck key required for bit changes
• Capacity range: 1/16 inch to 1/2 inch (0.0625 to 0.5000 inches)
• Threaded mount with 1/2-20 thread for direct spindle installation
• Steel chuck body for durability under sustained drilling loads
• Closed length of 2.9 inches keeps overall tool length compact
• Sleeve diameter of 1.68 inches fits standard drill spindle housings

Compatibility

Designed as an OEM-style replacement or upgrade chuck for drill presses and portable drills equipped with a 1/2-20 threaded spindle mount.

Installation Notes

Installation is performed by a qualified technician or machinist. Before mounting, disconnect and lock out power to the drill press or tool. Thread the chuck onto the 1/2-20 spindle by hand until fully seated, then verify runout with a dial indicator before returning the tool to service. Do not use impact force directly on the chuck sleeve to seat or remove the chuck.