Boneham P328GK Press Fit Headless Drill Bushing

Product Description

The BONEHAM P328GK is a headless press fit drill bushing designed to guide drill bits and other cutting tools with precision during machining and fabrication operations. Built to Industry Code P specifications, this bushing features a 0.209 inch inside diameter and a 0.5 inch outside diameter, with an overall length of 0.5 inches. Constructed from steel, it delivers the hardness and wear resistance required for repetitive drilling cycles. The press fit installation method locks the bushing permanently into a drill jig plate without the need for retaining screws or locking collars. Machinists and toolmakers install this type of bushing when a flush, non-renewable guide is the correct fit for the application.

This bushing is suited for use in drill jigs and fixture plates across general metalworking, manufacturing, and precision machining environments. The headless profile keeps the top face flush with the jig plate surface, making it appropriate for applications where a projecting head would interfere with workpiece clamping or tooling clearance. The inside diameter tolerance of plus 0.0001 to plus 0.0004 inches ensures close guidance for drill bits sized to the corresponding wire gauge designation of number 4.

Key Features

• Industry Code P headless press fit bushing for permanent jig plate installation
• 0.209 inch inside diameter with a tight tolerance of plus 0.0001 to plus 0.0004 inches for accurate drill guidance
• 0.5 inch outside diameter and 0.5 inch overall length for compact fitment
• Steel construction provides hardness and durability through high-cycle drilling operations
• Flush headless design eliminates interference with workpiece clamping or fixture setup
• Non-renewable configuration — intended for permanent installation in the jig plate

Compatibility

Designed as a standard Industry Code P press fit headless drill bushing compatible with drill jig plates and fixture tooling requiring a 0.5 inch OD bushing bore and a number 4 wire gauge inside diameter.

Installation Notes

Installation is performed by machinists or toolmakers using a press or arbor press to seat the bushing flush into a properly sized jig plate bore. Power down all associated machine tools before performing any jig plate modification or bushing installation. Because this is a non-renewable bushing, the fit is permanent — removal typically damages the bushing and may affect the jig plate bore, so confirm sizing before pressing. Verify jig plate bore diameter and surface finish to the appropriate tolerance before installation to ensure proper press fit retention.