Jacobs JCM6208 Drill Chuck 1/4 in Threaded 3/8-24 Keyed

Product Description

The JACOBS JCM6208 is a keyed drill chuck with a 1/4 inch maximum capacity, designed for threaded-mount installation on a 3/8-24 spindle. Built from steel with a plain bearing design, it accepts drill bits and accessories from 0.0394 inches up to 0.2500 inches (1/4 inch). The sleeve diameter measures 1.12 inches, and the chuck closes to a length of 1.95 inches. It ships with a K1 key for tightening. This chuck is suited for use in production drilling, maintenance, and repair applications where a reliable, threaded-mount keyed chuck is required.

The JCM6208 fits drill presses, portable electric drills, and other rotary tools equipped with a 3/8-24 threaded spindle. It is a standard replacement or upgrade chuck for light to medium-duty drilling tasks in industrial, maintenance, and trade environments. The keyed design provides positive clamping force, making it appropriate for applications where bit slippage under load is a concern. Installation and service are typically performed by maintenance technicians, machinists, or general tradespeople.

Key Features

• Maximum capacity of 1/4 inch (0.2500 inches) for standard drill bits and accessories
• Threaded mount with 3/8-24 thread size for direct spindle installation
• Keyed chuck design with included K1 key for secure bit clamping
• Steel chuck body for durability in production and maintenance use
• Closed length of 1.95 inches and sleeve diameter of 1.12 inches for compact fitment
• Plain bearing construction for straightforward service and replacement

Compatibility

Designed as an OEM-style replacement or direct-fit chuck for rotary tools and drill presses with a 3/8-24 threaded spindle and a maximum chuck capacity requirement of 1/4 inch.

Installation Notes

Disconnect and lock out power to the drill or drill press before removing or installing a chuck. Thread the chuck clockwise onto the 3/8-24 spindle until fully seated, then use the K1 key to verify the jaws open and close smoothly across the full capacity range. Do not overtighten the spindle connection or use impact methods that could damage the threaded interface. Service should follow the equipment manufacturer's instructions and applicable workplace safety standards.