Boneham H6412MH Press Fit Headed Drill Bushing Type H

Product Description

The BONEHAM H6412MH is a Type H press fit headed drill bushing manufactured from steel and hardened to 60 to 65 HRC. It is designed to guide cutting tools accurately during drilling, reaming, or boring operations. The bushing features a 0.625 inch inside diameter, a 1 inch body outside diameter, and a length under head of 0.75 inches. The headed design seats flush against a jig plate, providing positive axial location without mechanical fasteners. This is a permanent, non-renewable bushing — once pressed into the jig, it is not intended for routine removal. Machinists and tooling fabricators install these in drill jigs to maintain hole location accuracy across high-volume production runs.

The H6412MH is suited for drill jig applications in manufacturing and machine shop environments. It installs into jig plates where a press fit retention method is appropriate and where the bushing will not require replacement during the jig service life. The Type H industry code designates this as a headed press fit style, consistent with ANSI standards for drill bushing nomenclature. The tight inside diameter tolerance of plus 0.0001 to plus 0.0005 inches ensures reliable tool guidance and repeatable hole placement.

Key Features

• Press fit installation — no retaining ring or lock screw required
• Headed design provides positive axial seating in the jig plate
• Steel construction hardened to 60 to 65 HRC for long service life
• Inside diameter tolerance of plus 0.0001 to plus 0.0005 inches for precise tool guidance
• Non-renewable (permanent) bushing — designed for fixed jig applications
• Conforms to ANSI drill bushing standards

Compatibility

Designed as an ANSI-compliant Type H press fit headed drill bushing for use in standard drill jig plates wherever a 0.625 inch ID, 1 inch OD bushing with a 0.75 inch length under head is specified.

Installation Notes

Installation is performed by pressing the bushing into a prepared jig plate bore using an arbor press or hydraulic press — verify bore diameter and surface finish meet ANSI specifications for press fit retention before installation. Do not use hammer blows directly on the bushing head, as this can damage the ID tolerance or distort the head seating surface. Because this is a permanent, non-renewable bushing, jig plate design should account for the bushing not being removable without destroying the component. This part is typically installed by tool and die makers or jig and fixture fabricators.