Boneham H4012JR Press Fit Headed Drill Bushing Type H

Product Description

The BONEHAM H4012JR is a Type H press fit headed drill bushing manufactured from steel for use in jig and fixture tooling applications. It features an inside diameter of 0.377 inches with a tight tolerance of +0.0001 to +0.0005 inches, a body outside diameter of 5/8 inch, and a length under head of 3/4 inch. The headed design seats flush against the jig plate surface to resist axial movement during drilling operations. This bushing is a permanent, non-renewable style intended for fixed installations where the bushing will not be routinely changed between operations. Machinists, toolmakers, and fixture builders are the primary installers of this component.

The H4012JR is suited for use in drill jigs, fixtures, and production tooling where repeatable hole location accuracy is required. The press fit installation method provides a secure, interference-fit engagement with the jig plate bore. The headed configuration is appropriate for applications where the bushing must be retained against thrust loads without additional locking hardware. This bushing is commonly used in metalworking, fabrication, and precision machining environments handling standard twist drills or reamers sized to the V letter designation inside diameter.

Key Features

• Type H headed design resists axial pullout during drilling cycles
• Inside diameter tolerance of +0.0001 to +0.0005 inches for precise drill guidance
• Press fit installation — no locking screws or collars required
• Non-renewable (permanent) construction for fixed jig applications
• Steel construction provides durability in production drilling environments
• Head outside diameter of 51/64 inch and head height of 7/32 inch for positive seating

Compatibility

Designed as an OEM-style replacement or direct-install drill bushing for standard drill jigs and fixtures requiring a Type H press fit headed bushing with a 0.377 inch inside diameter and 5/8 inch body outside diameter.

Installation Notes

Installation is performed by toolmakers or machinists using a press or arbor press to drive the bushing into the prepared jig plate bore. Ensure the mating bore in the jig plate is machined to the correct interference fit diameter before pressing the bushing into position. Do not hammer the bushing directly without a driver to avoid damage to the head or bore alignment. Once pressed in, the non-renewable design means the bushing is not intended for removal and reinstallation.