H R Manufacturing 82-3.5-P Soft Lathe Chuck Jaw Serrated

Product Description

The H R MANUFACTURING 82-3.5-P is a serrated soft lathe chuck jaw machined from 1018 steel for use in manual and CNC lathe setups. Supplied as a 3-jaw set, these square-profile jaws measure 4 inches overall length and 1.75 inches overall width. The serrated interface engages the chuck scroll securely, while the soft jaw construction allows machinists and tool-room technicians to bore the jaws to a custom diameter for precise workholding on close-tolerance parts. Compatible chuck sizes range from 10.0 to 11.0 inches in diameter.

These soft jaws are intended for use on manual engine lathes and CNC turning centers where workholding accuracy and repeatability are required. A typical installation involves boring the jaws in place to match the workpiece diameter, providing full contact grip and minimizing runout. The serrated jaw interface is well suited for high-force turning operations where jaw slippage must be prevented. Shops handling production runs, repair work, or prototype turning on 10- to 11-inch chucks will find this jaw set directly applicable.

Key Features

• Serrated jaw interface provides positive engagement with chuck scroll for secure grip under cutting loads
• Soft 1018 steel construction allows custom in-chuck boring to match workpiece geometry
• Square jaw profile with 4 inch overall length for extended gripping reach
• Mount hole centers spaced 1.181 inches apart for consistent bolt-down alignment
• Groove width of 0.630 inches fits standard chuck T-slots in the compatible diameter range
• Supplied as a 3-jaw set matching standard 3-jaw scroll chuck configuration

Compatibility

Designed for 3-jaw lathe chucks with a compatible chuck diameter of 10.0 to 11.0 inches, a fastener size of 12 mm, and a groove width of 0.630 inches. Mount hole center distance is 1.181 inches.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with lathe chuck service. Disconnect and lock out the lathe before removing existing jaws or installing new ones. After bolting the soft jaws into the chuck using the appropriate 12 mm fasteners, bore the jaws in-place on the machine to achieve the desired grip diameter before introducing a workpiece. Verify jaw seating and fastener torque before returning the lathe to service.