Boneham LT646NC Headless L Drill Bushing Liner 3/4 in

Product Description

The BONEHAM LT646NC is a headless L-style drill bushing liner designed to guide cutting tools with precision in jig and fixture applications. Machined from alloy steel and hardened to 60-65 HRC, this liner provides a wear-resistant bore surface that maintains hole-location accuracy under repeated drilling cycles. With a 3/4-inch inside diameter, a 1-inch body outside diameter, and a 3/8-inch liner length, the LT646NC installs via press fit directly into a jig plate or master bushing. It is installed by toolmakers, machinists, and fixture builders working in production machining environments.

This liner is suited for use in drill jigs where a renewable, headless guide bushing is required. The headless profile allows flush or sub-flush seating in close-clearance fixture layouts where a flanged head would interfere with workpiece clamping or adjacent bushings. Press-fit installation locks the liner securely in the jig body without fasteners, making it appropriate for moderate-to-high production runs where position repeatability is critical.

Key Features

• Alloy steel construction hardened to 60-65 HRC for extended wear life
• 3/4-inch inside diameter accommodates standard drill shanks and boring tools
• 1-inch body outside diameter for common jig plate bores
• 3/8-inch liner length suits compact fixture layouts
• Headless design allows flush seating in tight clearance applications
• Press-fit installation provides secure, fastener-free retention

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard L-series drill jig systems accepting a 3/4-inch ID headless liner with a 1-inch body outside diameter and press-fit installation.

Installation Notes

Installation is performed by toolmakers or machinists using an arbor press or hydraulic press to seat the liner flush within the jig plate bore. The receiving bore should be finish-reamed to the appropriate interference-fit tolerance before pressing to avoid galling the liner OD. Never drive the liner with a hammer directly on the bore face. Verify concentricity and seating depth with a dial indicator before returning the jig to service.