Boneham P328GB Press Fit Headless Drill Bushing

Product Description

The BONEHAM P328GB is a press fit headless drill bushing designed to guide cutting tools accurately during drilling, reaming, and boring operations. Manufactured from steel with a hardness of 60 to 65 HRC, this bushing resists wear under repeated tool passes. It features a 0.199 inch inside diameter and a 1/2 inch outside diameter, with an overall length of 1/2 inch. The press fit design allows permanent installation into a drill jig or fixture plate without a locking mechanism. Machinists, tool and die makers, and production fixture builders install this type of bushing to maintain hole location accuracy across high-volume runs.

This bushing is suited for use in precision drill jigs in both production and job-shop environments. The P industry code designates a standard press fit headless style, making it a recognized fit for fixtures built to ANSI bushing standards. The 0.199 inch bore corresponds to a wire gauge size 8 drill, making it appropriate for pre-drilling or finish-drilling operations at that diameter. It is a non-renewable, permanent installation component intended for fixtures where bushing replacement is not required.

Key Features

• Press fit installation for permanent, secure seating in jig plate bores
• Headless design sits flush with or below the jig plate surface
• Steel construction with 60 to 65 HRC hardness for extended wear life
• Inside diameter tolerance of +0.0001 to +0.0004 inches for precise tool guidance
• Meets ANSI bushing standards for dimensional interchangeability
• Inside diameter matches wire gauge size 8 drill bit

Compatibility

Designed as an ANSI-standard press fit headless drill bushing for use in drill jigs and fixture plates requiring a 1/2 inch OD bushing bore and a 0.199 inch tool-guide diameter.

Installation Notes

Press fit bushings are installed by machinists or tool builders using an arbor press or bushing driver. The jig plate bore must be machined to the correct interference fit diameter per ANSI specifications before installation. Never drive the bushing with a hammer directly on the bore face, as this can damage the ID tolerance. Once pressed in, this bushing is a permanent installation and is not designed for field removal or replacement.