Jacobs JCM3657P Drill Chuck Key K5 7/16 Inch Pilot

Product Description

The JACOBS JCM3657P is a K5 drill chuck key designed to tighten and release drill chucks in shop, industrial, and job-site drilling applications. With a 7/16 inch (0.4400 inch decimal, 11.11 mm) pilot diameter, this key seats securely into the chuck pilot hole to deliver the torque needed for reliable bit clamping and release. It is a compact, single-piece tool used by machinists, electricians, plumbers, HVAC technicians, and general tradespeople who work with keyed drill chucks on a regular basis. At 0.07 pounds, it is lightweight and easy to store with the drill or in a tool pouch.

The JCM3657P is suited for use with keyed drill chucks requiring a K5 key, including applications in residential and commercial construction, mechanical rooms, and fabrication shops. This key is noted as compatible with JACOBS product number 20N chuck models. It is appropriate wherever a K5-style chuck key is called for in benchtop drill press, hand drill, or stationary machine tool setups.

Key Features

• K5 key number for correct fitment in matching keyed drill chucks
• 7/16 inch pilot diameter (0.4400 inch decimal / 11.11 mm) for secure pilot hole engagement
• Lightweight at 0.07 pounds for easy handling and storage
• Single-piece construction for straightforward use without additional components
• Compatible with JACOBS 20N chuck models per manufacturer data

Compatibility

Compatible with JACOBS chuck product number 20N as stated by the manufacturer. Suitable for keyed drill chucks requiring a K5 key with a 7/16 inch pilot diameter.

Installation Notes

A drill chuck key is installed and removed by hand - no additional tools are required. Always ensure the drill, press, or machine tool is powered off and fully stopped before inserting or removing the chuck key. Never leave a chuck key inserted in the chuck when the machine is unattended or prior to startup. Follow the machine manufacturer's guidelines for proper chuck tightening procedures.