Boneham P328HX Press Fit Headless Drill Bushing

Product Description

The BONEHAM P328HX is a headless press fit drill bushing used to guide drill bits, reamers, and other cutting tools with precision during machining and fabrication operations. Manufactured from steel and hardened to 60 to 65 HRC, this bushing resists wear through repeated tooling passes. The headless design sits flush with the jig plate surface, making it suited for applications where a protruding head would interfere with workpiece clearance or fixturing. The 9/32 inch inside diameter and 1/2 inch outside diameter give it a compact cross-section appropriate for close-tolerance jig work. It is installed by press fitting directly into a prepared hole in the jig or fixture body.

This bushing is used in machine shops, toolrooms, and production environments where accurate, repeatable hole location is required. It is a non-renewable type, meaning it is permanently installed and replaced as a unit if worn. Typical applications include drill jigs, assembly fixtures, and production tooling plates in metalworking, aerospace, and general manufacturing settings. Installation is performed by machinists and toolmakers using a press. The ANSI standard designation ensures dimensional conformance for interchangeability with tooling designed to standard P-series bushing specifications.

Key Features

• Headless design sits flush with jig plate for unobstructed workpiece access
• Press fit installation for permanent, secure seating in the jig body
• Steel construction hardened to 60 to 65 HRC for long wear life under repeated tool passes
• Inside diameter tolerance of plus 0.0001 to plus 0.0005 inches for precise tool guidance
• ANSI-compliant P-series bushing for dimensional interchangeability
• Non-renewable design — single-piece permanent installation

Compatibility

Designed as an OEM-style replacement or direct fit for standard P-series headless press fit drill bushing applications conforming to ANSI specifications.

Installation Notes

Installation is performed by machinists or toolmakers using an arbor press or hydraulic press. The receiving hole in the jig plate must be precision-bored to the correct interference fit dimension before installation. Do not drive the bushing in with a hammer, as this can damage the bore or misalign the bushing. Once pressed in, the bushing is considered permanent and is not designed for removal and reuse.