Accupro AY00612020000 Drill Chuck Key CK4 7/32 Inch

Product Description

The ACCUPRO AY00612020000 is a CK4 drill chuck key designed to tighten and release 1/4 inch Accupro drill chucks. The key features a 7/32 inch (0.220 inch) pilot diameter, which must match the chuck's pilot bore for proper seating and torque transfer. Without a correctly sized key, chuck jaws can slip or wear unevenly, reducing grip force and tool runout performance. This key is a standard hand tool used by machinists, maintenance technicians, and shop floor personnel in production drilling and general fabrication environments. It weighs 0.11 pounds, making it a lightweight, single-function accessory kept close to the drill press or portable drill.

This chuck key is intended for use with 1/4 inch Accupro drill chucks. It fits drilling applications in light manufacturing, toolroom, and machine shop settings where keyed chucks are specified for secure bit retention under repeated use. The CK4 designation identifies the key geometry, including pilot diameter and gear tooth profile, and must align with the chuck model. Technicians typically keep one key per chuck station to avoid cross-use errors between mismatched chuck sizes on multi-spindle setups.

Key Features

• CK4 key number matches specific Accupro 1/4 inch chuck configurations
• 7/32 inch (0.220 inch) pilot diameter for precise chuck pilot bore engagement
• Lightweight at 0.11 pounds for easy single-hand operation
• Single-piece construction for reliable torque application without flex
• Sold individually, one key per package

Compatibility

Designed for use with 1/4 inch Accupro drill chucks requiring a CK4 key with a 7/32 inch pilot diameter.

Installation Notes

Insert the pilot into the chuck's pilot bore and engage the gear teeth fully before applying torque to open or close the jaws. Always remove the chuck key from the chuck before powering the drill or drill press. Do not use a chuck key as a pry tool or substitute for a wrench on any other fastener. Replace the key if the pilot shows visible wear or the teeth strip, as a damaged key can damage the chuck ring gear.