Gibraltar 290-1181 Lathe Chuck Key 4 Inch Self Ejecting

Product Description

The GIBRALTAR 290-1181 is a self-ejecting lathe chuck key designed for use with 4-inch chuck diameter lathes. The self-ejecting mechanism automatically disengages the key from the chuck socket when released, reducing the risk of the key being left in the chuck during operation. The body measures 2.36 inches in length, and the square drive measures 0.315 inches. This key is installed and used by machinists and toolroom technicians working with manual lathe setups requiring a reliable, safe tightening tool.

This chuck key is intended for use with 3-jaw chucks on manual lathes with a 4-inch chuck diameter. It is a practical replacement or spare for shop floor environments, vocational training facilities, and production machine shops. The compact body length makes it suitable for lathes with limited clearance around the chuck housing. Typical applications include workholding setup and chuck adjustment during turning operations.

Key Features

• Self-ejecting design automatically removes key from chuck socket when released
• Compatible with 4-inch diameter lathe chucks
• Fits 3-jaw chuck configurations
• Body length of 2.36 inches for compact fitment
• Square drive size of 0.315 inches for positive engagement

Compatibility

Designed for use with 3-jaw lathe chucks with a 4-inch chuck diameter compatibility and a 0.315-inch square socket drive opening.

Installation Notes

This chuck key is a hand-operated accessory and does not require power tools or electrical isolation for use. Always confirm the lathe spindle is fully stopped and the machine is in a locked-out state before adjusting or removing the chuck or workpiece. Never leave a chuck key inserted in the chuck when stepping away from the machine or before starting the spindle. The self-ejecting feature is a safety aid but does not replace proper lockout-tagout procedures.