Jacobs JCM6219 Drill Chuck 3/8 in Threaded Mount 3/8-24

Product Description

The JACOBS JCM6219 is a keyed drill chuck designed for threaded-mount applications requiring precise bit retention across a wide capacity range. It accepts shank diameters from 0.0394 inches up to 3/8 inches (0.3750 inches), making it suitable for a broad selection of twist bits, step bits, and specialty tooling. The chuck mounts via a 3/8-24 threaded interface and uses a K2 key for tightening. Built from steel with a plain bearing design, the JCM6219 weighs 0.81 pounds and delivers the mechanical grip needed for production drilling and maintenance work. Licensed contractors, millwrights, and tool-room technicians will find this chuck a direct-fit replacement for worn or damaged keyed chucks on compatible spindles.

The JCM6219 is suited for use on bench drill presses, portable electric drills, and drill press machines that accept a 3/8-24 threaded spindle nose. Its 1.67-inch sleeve diameter and compact closed length of 2.81 inches make it a practical fit in environments where clearance around the work envelope matters. Both industrial maintenance and light manufacturing applications are common install scenarios for this chuck size and mount configuration.

Key Features

• 3/8-24 threaded mount for direct spindle attachment without an adapter arbor
• Capacity range from 0.0394 inches to 0.3750 inches (3/8 inches) accommodates most standard bit shanks
• Keyed design with K2 key provides positive bit retention under load
• Steel construction for durability in production and maintenance environments
• Closed length of 2.81 inches and open length of 2.17 inches for compact profile
• Sleeve diameter of 1.67 inches for standard jaw-key engagement

Compatibility

Designed as a replacement or spare keyed drill chuck for drill presses and portable drills fitted with a 3/8-24 threaded spindle nose.

Installation Notes

Installation is typically performed by a machinist, millwright, or qualified maintenance technician. Before replacing a drill chuck, disconnect or de-energize the drill or drill press completely and allow all rotating components to come to a full stop. Thread the chuck onto the spindle nose by hand first to confirm proper thread engagement, then secure according to the machine manufacturer's torque guidance. Inspect the K2 key and chuck jaws for wear before returning the tool to service.