Gibraltar 290-1184 Lathe Chuck Key 6 Inch 3-jaw Chuck

Product Description

The GIBRALTAR 290-1184 is a lathe chuck key designed for use with 6-inch chuck diameter lathes. It features a self-ejecting mechanism that automatically releases the key from the chuck socket, reducing the risk of accidental spindle engagement. The body measures 3.35 inches in length with an actual key square size of 0.393 inches. This key is compatible with 3-jaw chucks and is a standard tool used by machinists and toolroom technicians on manual lathes. Weighing 1.32 pounds, it is a solid, practical replacement or spare for shop environments.

This chuck key is suited for manual lathe operations in machine shops, toolrooms, vocational training facilities, and maintenance departments. It fits 6-inch 3-jaw chucks commonly found on bench lathes and mid-size engine lathes. The self-ejecting feature makes it appropriate for shops enforcing key-removal safety protocols. Machinists working with general-purpose turning operations will find this a direct-fit replacement for worn or missing chuck keys on compatible equipment.

Key Features

• Self-ejecting design automatically removes the key from the chuck to prevent accidental spindle starts
• Fits 6-inch chuck diameter 3-jaw chucks
• Body length of 3.35 inches for a compact, easy-grip profile
• Actual key square size of 0.393 inches for precise socket engagement
• Weighs 1.32 pounds — solid construction for durable shop use

Compatibility

Compatible with 3-jaw chucks having a 6-inch chuck diameter. Designed as a replacement or spare chuck key for manual lathes equipped with standard 3-jaw chuck configurations accepting a 0.393-inch square key drive.

Installation Notes

Chuck key installation and replacement is performed by machinists or maintenance personnel. Before changing or adjusting chuck tooling, always confirm the lathe spindle is fully stopped and the machine is powered down or locked out per applicable lockout/tagout procedures. Insert the square key drive fully into the chuck socket before applying torque to ensure proper engagement and avoid rounding the socket. Remove the key immediately after use — the self-ejecting mechanism assists with this but should not replace proper operator habit.