Jacobs JCM3649P20 Drill Chuck Key K2 1/4 Inch Pilot

Product Description

The JACOBS JCM3649P20 is a K2 drill chuck key designed for tightening and loosening drill chucks on stationary and portable drilling equipment. The key features a 0.25-inch pilot diameter, allowing it to seat correctly in the chuck pilot hole for secure engagement during chuck adjustment. Weighing 0.33 pounds, it is a compact, lightweight tool suited for use at the drill press, lathe, or hand drill. Machinists, tool-and-die technicians, and maintenance professionals rely on this key for routine chuck service and bit changes.

This chuck key is intended for use with JACOBS 2 Series drill chucks. It is a standard replacement or spare key for shop environments, field maintenance operations, and industrial tool cribs where drill chuck service is performed regularly. The K2 designation identifies the key pattern, ensuring proper fit with compatible chuck body designs. Keeping a spare key on hand reduces downtime during bit changes on production equipment.

Key Features

• K2 key number for correct engagement with compatible JACOBS 2 Series chuck bodies
• 0.25-inch pilot diameter for precise seating in the chuck pilot hole
• Lightweight at 0.33 pounds for easy one-handed use
• Compact form factor suits both bench-top and portable drill applications
• Direct replacement key for worn or missing OEM chuck keys

Compatibility

Designed for use with JACOBS 2 Series drill chucks requiring a K2 key with a 0.25-inch pilot diameter.

Installation Notes

Chuck key replacement and chuck service should be performed by a qualified machinist or maintenance technician. Before servicing a drill chuck, ensure the machine is powered down and, where applicable, locked out per OSHA lockout/tagout procedures. Insert the pilot pin fully into the chuck pilot hole before applying torque to avoid slipping or damaging the chuck teeth. Do not use a chuck key as a lever extension or apply additional force beyond hand operation.