H R Manufacturing HR-149-2.5-OP Soft Lathe Chuck Jaw

Product Description

The H R MANUFACTURING HR-149-2.5-OP is a soft lathe chuck jaw with a serrated jaw interface, designed for use in metal-turning and machining operations. Made from 1018 steel, this jaw fits an 8-inch chuck and is sold as a set of 3 jaws. The overall length is 4.25 inches and the overall width is 1.5 inches. The 1018 steel construction allows machinists to bore the jaws to a custom diameter, making them a go-to choice when precise workholding is required for a specific part run. The serrated interface provides positive engagement with compatible chuck bodies.

This soft jaw is suited for manual and CNC lathes in job shops, tool rooms, and production environments. It is intended for use on 8-inch three-jaw chucks where the operator needs to machine the jaw face to match a specific workpiece diameter or profile. The 1-inch distance between mount hole centers and 0.551-inch groove width are critical dimensions when verifying fit to an existing chuck body. Machinists and toolroom technicians are the primary installers.

Key Features

• Serrated jaw interface for secure engagement with compatible chuck bodies
• 1018 steel construction allows easy boring to custom diameters
• Designed for 8-inch chuck diameter compatibility
• 1-inch distance between mount hole centers for repeatable alignment
• 0.551-inch groove width for precise chuck body fitment
• Sold as a set of 3 jaws to complete one chuck setup

Compatibility

Designed for use with 8-inch three-jaw lathe chucks requiring a serrated soft jaw interface with a 1-inch mount hole center distance and a 0.551-inch groove width.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with lathe chuck service procedures. Before removing or installing chuck jaws, isolate the lathe from its power source following the applicable lockout/tagout procedure. Verify that the groove width, mount hole spacing, and fastener size match the chuck body specifications before installation. Soft jaws should be bored to final diameter while mounted in the chuck to ensure concentricity.