Boneham HL4812LK Hl Drill Bushing Liner with Head

Product Description

The BONEHAM HL4812LK is an HL-series drill bushing liner with head, designed to guide drill bits with precision in jig and fixture applications. It features a 1/2 inch inside diameter bore and a 3/4 inch body outside diameter, with a 3/4 inch liner length and a 3/32 inch head height. Constructed from alloy steel, this liner is installed via press fit into a master bushing or jig plate, providing a stable, renewable guide that maintains accurate hole location across repeated drilling operations. Machinists, toolmakers, and fixture builders rely on this component in production environments where consistent hole placement is critical.

This liner is suited for use in drill jigs where interchangeable or renewable bushings are required. The head style retains the liner against axial movement during drilling, making it appropriate for through-hole jig plate installations. It fits standard HL-designation master bushings and is commonly used in metalworking, fabrication, and precision machining shops. The press fit installation ensures a secure, low-profile seating within the jig plate.

Key Features

• 1/2 inch inside diameter for consistent drill bit guidance
• 3/4 inch body outside diameter with standard HL industry code designation
• 3/4 inch liner length provides adequate bearing surface for drill guidance
• 3/32 inch head height retains liner against axial pullout
• 7/8 inch head outside diameter for positive seating on jig plate surface
• Alloy steel construction for hardness and wear resistance in production use
• Press fit installation method for secure, permanent or semi-permanent seating

Compatibility

Designed as an OEM-style replacement and standard component for HL-designation drill jig systems requiring a headed liner bushing with press fit installation.

Installation Notes

Installation is performed by pressing the bushing liner into a prepared jig plate bore using an arbor press or hydraulic press to the appropriate depth. Ensure the receiving bore is clean, properly sized, and free of burrs before installation. Power down all machinery before handling jig components. Follow applicable shop safety procedures and manufacturer tolerancing guidelines for press fit clearances.