Chuck key Proline 6/8/10 mm 12-tooth model 31388

Proline chuck key model 31388 is a manual accessory designed for tightening and loosening 12-tooth drill chucks with compatible jaw sizes of 6 mm, 8 mm and 10 mm. The tool provides positive mechanical engagement through its 12-tooth gear, enabling secure clamping and release of drill bits and accessories in handheld and bench drills. Constructed for routine workshop, maintenance and DIY use, the chuck key is straightforward to operate and intended to deliver consistent chuck adjustments when precise bit retention is required.

Advantages

The 12-tooth gear profile ensures accurate meshing with compatible chucks for reliable torque transmission during tightening and loosening. Compact and lightweight, the chuck key is easy to store in toolboxes or attach to a drill stand for quick access. Its compatibility with three common chuck jaw sizes (6 mm, 8 mm, 10 mm) reduces the need for multiple keys and simplifies tool management. The simple mechanical design offers durability and minimal maintenance.

Suitable for

• Tightening and loosening drill chucks in handheld drills
• Workshop and maintenance tasks requiring frequent bit changes
• DIY projects at home where standard 6/8/10 mm chucks are used
• Light industrial applications with manual chuck adjustment

Key specifications

• Tooth count: 12-tooth gear for mechanical engagement
• Compatible chuck jaw sizes: 6 mm, 8 mm, 10 mm
• Function: manual tightening and loosening of drill chucks
• Use environment: workshop, maintenance, DIY, light industrial

How to use

Insert the key's gear into the matching 12-tooth recess on the drill chuck and rotate clockwise to tighten or counterclockwise to loosen the jaws. Hold the drill body or spindle steady while operating the key to prevent slippage and ensure even engagement of the jaws around the bit. Verify that the bit is centered and securely clamped before starting the drill; repeat tightening if necessary to achieve firm retention.

Usage recommendations

Use the chuck key only with chucks that match the 12-tooth profile and the supported jaw sizes (6 mm, 8 mm, 10 mm). Avoid excessive force when tightening to prevent damage to the chuck or key. Keep the key clean and free of debris, and store it in a dry place to reduce wear. For repetitive high-torque or production use, consider a keyed or keyed chuck maintenance schedule to check for wear.