Boneham H328GO Press Fit Headed Drill Bushing

Product Description

The BONEHAM H328GO is a Type H press fit headed drill bushing used to guide drill bits and other cutting tools with precision during machining and fabrication operations. The bushing features a 7/32-inch inside diameter and a 1/2-inch body outside diameter, with a length under the head of 1/2 inch. Manufactured from steel hardened to 60 to 65 HRC, it provides the wear resistance required for repetitive drilling in production jig and fixture applications. The headed design seats flush against the jig plate, keeping the bushing positively located without additional locking hardware. This part is installed by machinists, tool-and-die makers, and precision fabricators.

The H328GO is suited for use in drill jigs and fixture plates where a permanent, non-renewable press fit bushing is required. It is appropriate for light to medium production runs in metalworking shops, machine shops, and manufacturing facilities. The press fit installation method means the bushing is driven into the jig plate bore and is intended to remain in place for the life of the jig rather than be swapped out between operations.

Key Features

• Type H headed bushing with 7/32-inch inside diameter for consistent drill guidance
• 1/2-inch body outside diameter with 39/64-inch head outside diameter for positive seating
• Length under head: 1/2 inch
• Steel construction hardened to 60 to 65 HRC for long service life under repeated tool contact
• Inside diameter tolerance of +0.0001 to +0.0004 inch for close-tolerance drilling work
• Meets ANSI standards for drill bushing dimensions and performance
• Non-renewable (permanent) press fit design — no liner bushing required

Compatibility

Designed as an ANSI-standard Type H press fit headed drill bushing for use in jig plates and fixture assemblies requiring a permanent bushing installation with a 7/32-inch bore.

Installation Notes

Installation is performed by machinists or toolmakers using an arbor press or similar pressing equipment. The receiving bore in the jig plate must be machined to the correct interference fit diameter before pressing the bushing in place. Because the H328GO is a non-renewable bushing, it is not intended to be removed once installed without risk of damage to the jig plate. Power down all machine tools and secure the workpiece before pressing the bushing into position.