Chuck key Proline 10/13 mm 11-tooth model 31389 for drill chucks

The Proline chuck key model 31389 is a compact tool designed to operate keyed drill chucks with 10 mm and 13 mm diameters. It features an 11-tooth gear that engages the chuck's pinion to tighten or loosen the jaws, allowing secure clamping and quick bit changes on portable and bench drills. The key's robust construction provides reliable engagement with the chuck teeth for consistent torque transfer during drilling operations.

Advantages

The 11-tooth gear profile ensures precise meshing with standard keyed chucks, reducing slippage and wear on both the key and the chuck. Compatibility with 10 mm and 13 mm chuck sizes makes the tool versatile for common consumer and workshop drills. Its compact form factor simplifies storage and handling, and the durable materials used in the key resist deformation under normal tightening loads.

Suitable for

• Tightening and loosening keyed drill chucks on portable hand drills
• Bit changes on drill presses and bench drills with keyed chucks
• Workshop and home maintenance tasks requiring secure drill bit clamping

Key specifications

• Chuck compatibility: fits 10 mm and 13 mm keyed drill chucks
• Gear teeth: 11-tooth gear profile for standard keyed chucks
• Function: manual tightening and loosening of keyed chucks
• Form factor: compact, hand-operated key
• Material characteristics: engineered for durability and resistance to deformation under normal use

How to use

Insert the gear end of the chuck key into the matching pinion hole on the keyed chuck, ensuring the teeth mesh fully. Rotate the key clockwise to tighten the chuck jaws around the drill bit or counterclockwise to loosen them and remove the bit. Apply steady, moderate force to avoid stripping the teeth; if greater torque is required, reposition the key and repeat the motion rather than forcing a single turn. After use, store the key in a tool rack or the drill's accessory holder to keep it available and prevent loss.

Usage recommendations

Use the chuck key only with compatible keyed chucks of the specified sizes and maintain clean, debris-free teeth on both the key and the chuck. Periodically inspect the key for wear or rounded teeth and replace it if engagement becomes unreliable. For safety, ensure the drill is switched off and unplugged (or battery removed) before changing bits.