Accupro 685.62844253 Drill Chuck Key K4 3/8 in Pilot

Product Description

The ACCUPRO 685.62844253 is a K4 drill chuck key designed for use with 3/4 inch capacity chucks in drill press and machine tool applications. The pilot diameter measures 0.374 inches, conforming to standard K4 key geometry. The part weighs 0.13 pounds and mounts via a 4JT taper socket. Machinists, maintenance technicians, and tool room personnel use this key to tighten and release drill chucks during bit changes. Its compact size and standard pilot spec make it a direct fit for a range of compatible chuck models without modification.

This chuck key is suited for stationary drill press setups and bench-top drilling machines in industrial, maintenance, and light manufacturing environments. It is a replacement or spare key for shops running compatible chuck models in production or toolroom service. The 3/4 inch chuck capacity rating ensures the key delivers adequate torque engagement for standard drill press operations. Compatible part numbers include 16N, 18N, 36, 36B, 37KD, 37PD, and 59B chucks as specified by the manufacturer.

Key Features

• K4 key number for standard pilot engagement geometry
• Pilot diameter of 0.374 inches for precise chuck socket fit
• Designed for use with 3/4 inch capacity chucks
• 4JT taper mount for secure seating in the chuck key socket
• Lightweight at 0.13 pounds for easy single-hand operation

Compatibility

Compatible with chuck product numbers 16N, 18N, 36, 36B, 37KD, 37PD, and 59B as stated by the manufacturer. Designed for use with 3/4 inch capacity chucks using a 4JT mount.

Installation Notes

Installation is performed by a machinist or maintenance technician. Before changing drill bits, power down the drill press and confirm the spindle has come to a complete stop. Insert the chuck key pilot fully into the chuck socket before applying torque to avoid slippage or socket wear. Do not use an extension or additional leverage on the chuck key handle, as over-tightening can damage the chuck jaws.