Gibraltar 290-1180 Lathe Chuck Key 20 Inch Chuck

Product Description

The GIBRALTAR 290-1180 is a lathe chuck key designed for use with large-diameter lathe chucks in machine shop and industrial turning applications. Built for 20-inch chuck diameter compatibility, this key features a 4.72-inch body length and an actual key square size of 0.5512 inches, making it sized for heavy-duty manual chuck tightening and release operations. Machinists and lathe operators rely on this type of key to seat and remove workpieces securely in the chuck. It weighs 3.31 pounds, reflecting a solid, durable construction appropriate for shop-floor use.

This chuck key is intended for use with 4-jaw lathe chucks on lathes with a 20-inch chuck diameter. It is a standard fit for manual lathe operations in production machining, toolroom environments, and job shops where large-capacity lathes are common. The 4-jaw chuck compatibility makes it appropriate for holding irregular or asymmetric workpieces that require independent jaw adjustment.

Key Features

• 20-inch chuck diameter compatibility for large-capacity lathe chucks
• 0.5512-inch actual key square size for precise socket engagement
• 4.72-inch body length for adequate leverage during chuck operation
• Compatible with 4-jaw independent chuck configurations
• Solid construction at 3.31 pounds for durable shop-floor use

Compatibility

Compatible with 4-jaw lathe chucks requiring a 20-inch chuck diameter and a 0.5512-inch key square size. Designed as an OEM-style replacement or direct-fit chuck key for large industrial lathes using this chuck and key square specification.

Installation Notes

Chuck key installation and use should be performed by a qualified machinist familiar with lathe operation and shop safety procedures. Always ensure the lathe is fully powered down and the spindle is locked before inserting the chuck key. Never leave the chuck key inserted in the chuck unattended, as an unsecured key can become a serious projectile hazard when the lathe is started. Follow applicable OSHA machine guarding and shop safety standards during all chuck operations.