Abbott Workholding Products KW4A Soft Lathe Chuck Jaw

Product Description

The ABBOTT WORKHOLDING PRODUCTS KW4A is a soft lathe chuck jaw designed for use in serrated-interface lathe chucks. Machined from 6061-T6 aluminum, this jaw offers a lightweight, machinable body that allows machinists to bore custom profiles for workholding applications. The square jaw shape and serrated interface provide positive, repeatable seating against the chuck master jaw. Compatible with chucks up to 4 inches in diameter, the KW4A has an overall length of 2 inches and an overall width of 1 inch. It is sold and packaged as a single jaw. Mounting hole centers are spaced 0.5512 inches apart, and the fastener size is 0.315 inches.

The KW4A is used in manual and CNC lathe setups where a soft jaw is required for gripping custom, delicate, or irregularly shaped workpieces. Because it is aluminum, the jaw can be bored or turned to a specific inside diameter directly on the machine, producing a precision fit to the part being held. This is a common practice in job shop and production machining environments when gripping thin-walled parts, castings, or finished components that cannot sustain the marring risk of hardened jaws. The part is suited for light to medium turning operations on small to mid-size lathes using 4-inch chuck bodies.

Key Features

• Serrated jaw interface for positive, repeatable engagement with master jaws
• 6061-T6 aluminum construction for easy on-machine boring and light weight
• Square jaw shape compatible with standard 3-jaw chuck configurations
• Mounting hole center distance of 0.5512 inches for precise bolt-down alignment
• Slot width of 0.394 inches and groove width of 0.394 inches for standard serration fitment
• Designed for chucks up to 4 inches maximum compatible diameter

Compatibility

Designed as a serrated soft jaw replacement or spare for 3-jaw lathe chucks with a maximum compatible chuck diameter of 4 inches and a 0.5512-inch mounting hole center distance. Verify serration pitch and fastener size against the chuck manufacturer specifications before installation.

Installation Notes

Installation is performed by a machinist or lathe operator. Power down and lock out the lathe spindle before removing or installing chuck jaws. Use the correct fastener size of 0.315 inches as specified, and torque evenly to avoid jaw distortion. After mounting, bore the soft jaw in place on the chuck to achieve a true running grip surface before use.