Boneham LT4012JQ Headless L Drill Bushing Liner 3/8 in

Product Description

The BONEHAM LT4012JQ is a headless L-series drill bushing liner designed to provide a precise, hardened guide bore for interchangeable drill bushings in jig and fixture applications. It features a 3/8 inch inside diameter and a 5/8 inch body outside diameter, with a liner length of 3/4 inch. Constructed from alloy steel and hardened to 60-65 HRC, it delivers the wear resistance and dimensional stability required for repetitive drilling operations. Installation is accomplished by press fit into the jig plate, seating flush without a head flange. Tool and die makers, machinists, and fixture builders are the primary installers of this component.

The LT4012JQ is used in drill jig fixtures across manufacturing, fabrication, and machine shop environments. It serves as the permanent liner into which renewable slip-fixed or lock-fixed drill bushings are installed, allowing the interchangeable bushing to be swapped out when worn without disturbing the jig plate bore. This design is suited for production drilling where hole location accuracy must be maintained across high cycle counts. Applicable in both light-duty and medium-duty fixture setups where a 3/8 inch bore guide is required.

Key Features

• 3/8 inch inside diameter provides a precise guide bore for compatible interchangeable bushings
• 5/8 inch body outside diameter for press fit installation into the jig plate
• 3/4 inch liner length suits standard jig plate thicknesses
• Alloy steel construction hardened to 60-65 HRC for extended wear life
• Headless L-series design seats flush with the plate surface, no flange interference
• Press fit installation method ensures secure, permanent seating in the fixture

Compatibility

Designed as an OEM-style replacement or new-installation liner compatible with standard L-series interchangeable drill bushing systems requiring a 3/8 inch bore and 5/8 inch outside diameter press fit liner.

Installation Notes

Installation of drill bushing liners is typically performed by machinists or tool and die makers using an arbor press to achieve proper press fit seating. The jig plate bore must be machined to the tolerance specified for the liner outside diameter before installation. Ensure the plate bore and liner are clean and free of burrs or debris prior to pressing. Once installed, the liner should be flush or within acceptable tolerance of the plate surface before renewable bushings are inserted.