Boneham H4812LG Press Fit Headed Drill Bushing

Product Description

The BONEHAM H4812LG is a Type H press fit headed drill bushing machined from steel and hardened to 60 to 65 HRC. It is designed to guide drill bits, reamers, and other cutting tools with precision in jig and fixture applications. The bushing presses directly into a jig plate without a locking mechanism, providing a permanent, low-profile installation. Inside diameter is 31/64 inches with a tolerance of +0.0001 to +0.0005 inches, ensuring consistent tool guidance and repeatable hole location across production runs. Licensed machinists, toolmakers, and fixture builders typically specify this component when permanent bushing installation is required.

The H4812LG suits metalworking and manufacturing environments where drill jigs demand tight tolerances and durable tool guidance. It is appropriate for both light and medium production fixtures in machine shops and fabrication facilities. The headed design provides a positive stop against the jig plate surface, controlling insertion depth without additional hardware. Its compact head and body dimensions make it a practical choice where clearance between adjacent bushings or workpiece features is a consideration.

Key Features

• Press fit installation method for permanent, fixed positioning in jig plates
• Steel construction hardened to 60 to 65 HRC for wear resistance and long service life
• Inside diameter of 31/64 inches with tolerance of +0.0001 to +0.0005 inches for precise tool guidance
• Head outside diameter of 59/64 inches and head height of 7/32 inches for positive seating against jig surface
• Body outside diameter of 3/4 inches with 3/4 inch length under head
• Conforms to ANSI standards for drill bushing geometry and dimensions

Compatibility

Designed as an OEM-style replacement or new-installation component for Type H press fit headed drill bushing applications conforming to ANSI standards. Intended for use in standard jig plates sized for a 3/4 inch body outside diameter press fit bushing.

Installation Notes

Press fit bushings require an arbor press or hydraulic press for proper installation; do not drive with a hammer, as uneven force can damage the bore or jig plate. Verify the jig plate bore diameter and finish meet ANSI press fit tolerances before installation, as an undersized or oversized hole will affect retention and accuracy. Once pressed in, these bushings are not intended for removal and reuse. Installation is typically performed by a toolmaker or machinist in a controlled shop environment.