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

Product Description

The H R MANUFACTURING HR-149-2.5 is a serrated soft lathe chuck jaw designed for use with 8-inch three-jaw lathe chucks in machine shop and turning center applications. Machined from 1018 steel, this square-profile jaw measures 3-1/2 inches in overall length and 1-1/2 inches in overall width. The serrated interface provides positive engagement with matching chuck serrations, allowing the jaw to be repositioned and re-secured without loss of holding accuracy. Installation requires standard lathe tooling and basic hand tools. Licensed machinists and toolroom technicians are the typical end users for this component.

This jaw is suited for manual and CNC lathe chucks that accept serrated soft jaw inserts with an 8-inch compatible chuck diameter. The 1.0-inch distance between mount hole centers and the 0.551-inch groove width match standard serrated chuck specifications. Soft jaws are commonly used when workpiece geometry or material requires custom bore profiles, providing a machinable grip surface that protects finished parts and accommodates irregular or delicate workpieces.

Key Features

• Serrated jaw interface for positive repositioning and secure seating in compatible chucks
• Machined from 1018 steel for reliable machinability and durability in turning applications
• Square jaw shape with 3-1/2 inch overall length and 1-1/2 inch overall width
• Designed for 8-inch chuck diameter compatibility
• 1.0-inch mount hole center distance and 0.551-inch groove width match standard serrated chuck interfaces
• Sold as a set of 3 jaws per package

Compatibility

Designed for use with 8-inch diameter lathe chucks accepting serrated soft jaw inserts with a 0.551-inch groove width, 1.0-inch mount hole center spacing, and 12 mm fastener size.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the lathe fully powered down and the spindle locked before handling chuck components. Verify that jaw serrations are fully seated and mount fasteners are torqued per the chuck manufacturer specifications before operating the machine. Soft jaws typically require finish boring to size on the chuck where they will be used to ensure concentricity. Follow applicable shop safety protocols and machine guarding requirements during installation and use.