Boneham L328IM Headless L Drill Bushing Liner 5/16 in

Product Description

The BONEHAM L328IM is a headless L-style drill bushing liner designed to guide drill bits with precision in jig and fixture applications. With a 5/16-inch inside diameter and a 1/2-inch body outside diameter, this liner seats into a master bushing or liner hole using a press fit installation method. Constructed from alloy steel hardened to 60-65 HRC, it provides the wear resistance required for repetitive drilling operations in production and maintenance environments. The 1/2-inch liner length keeps the profile compact for tight fixture layouts. Licensed toolmakers, machinists, and fixture builders are the typical installers.

This bushing liner is suited for use in drill jigs where a renewable slip bushing system is employed. The headless L designation means the liner sits flush with the jig plate surface, making it appropriate for applications where a head would interfere with workpiece clearance or tool travel. It is commonly used in metalworking, fabrication, and precision machining environments handling steel, aluminum, and similar materials requiring consistent hole location across multiple parts.

Key Features

• 5/16-inch inside diameter sized for standard drill bit guidance
• 1/2-inch body outside diameter for press fit seating in liner holes
• Alloy steel construction hardened to 60-65 HRC for extended wear life
• Headless L-style profile allows flush installation with jig plate surface
• 1/2-inch liner length suits compact fixture configurations
• Press fit installation method for secure, positive location in the master bushing

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard L-series drill bushing liner systems using a 1/2-inch outside diameter liner hole with press fit retention.

Installation Notes

Installation is performed by machinists or tool and die makers using a press or arbor press to seat the liner with a controlled press fit — do not drive with a hammer directly on the bushing face. Ensure the receiving bore is clean, dimensionally correct, and free of burrs before pressing. Remove all chips and debris from the jig plate before installation. Verify liner seating depth and alignment before resuming drilling operations.