Boneham H4812JJ Press Fit Headed Drill Bushing

Product Description

The BONEHAM H4812JJ is a Type H press fit headed drill bushing machined from steel for use in jig and fixture applications. It accepts a 23/64-inch inside diameter with a tight tolerance of +0.0001 to +0.0005 inches, ensuring accurate drill guidance and repeatable hole location. The body outside diameter measures 3/4 inch, the length under the head is 3/4 inch, and the head outside diameter is 59/64 inch with a head height of 7/32 inch. Installation is permanent — this is a non-renewable bushing pressed directly into a drill jig plate. Machinists, toolmakers, and fixture builders are the primary installers.

This bushing is suited for production drilling operations where a fixed, permanent guide is required. It is pressed into a prepared hole in a drill jig or fixture plate and remains in place for the life of the tooling. Typical applications include metalworking shops, assembly fixtures, and precision machining environments where consistent hole location is critical across high part volumes. The headed design seats flush against the jig plate surface, preventing axial movement under drilling loads.

Key Features

• Type H headed press fit design — permanent, non-renewable installation
• Inside diameter: 23/64 inch with tolerance of +0.0001 to +0.0005 inches for precise drill guidance
• Body outside diameter: 3/4 inch; length under head: 3/4 inch
• Head outside diameter: 59/64 inch; head height: 7/32 inch
• Steel construction for durability in repetitive drilling operations
• Not counterbored — standard headed configuration for surface-mount seating

Compatibility

Designed as an OEM-style replacement or direct-install component for drill jigs and fixture plates requiring a Type H press fit headed bushing with a 23/64-inch inside diameter and 3/4-inch body outside diameter.

Installation Notes

Installation is performed by toolmakers or machinists using an arbor press or hydraulic press to drive the bushing into a precision-reamed hole in the jig plate. The mating hole in the fixture plate must be machined to the correct interference-fit diameter before installation. Once pressed in, this bushing is not intended for removal or replacement. Follow standard shop safety practices and ensure the fixture plate is properly supported to avoid distortion during pressing.