Boneham AM00000235 Drill Bushing Hm 6.75 in Id

Product Description

The BONEHAM AM00000235 is a press fit headless drill bushing in the HM industry code configuration, designed to guide cutting tools with precision during drilling, reaming, and boring operations. Manufactured from steel with a hardness rating of 60 to 65 HRC, this bushing delivers the wear resistance required for sustained production use. The inside diameter measures 6.75 inches with a tolerance of +0.005/+0.014 mm, ensuring consistent tool guidance and repeatability across multiple cycles. The body outside diameter is 12.00 mm and the overall bushing length is 20.00 mm. Installation is accomplished by pressing the bushing directly into a drill jig plate without the need for a locking collar or head flange.

This bushing is suited for use in drill jigs and fixture plates in metalworking and machining environments, including job shops, toolrooms, and production machining operations. The headless design allows the bushing to sit flush with the jig plate surface, which is common in applications where clearance above the plate is limited or where a smooth top surface is required. Machinists and toolmakers install this type of bushing during jig assembly or as a direct replacement in existing drill jig fixtures. It conforms to ANSI standards and is not designed for renewable (slip or liner) bushing setups.

Key Features

• Press fit installation — no head flange or locking collar required
• HM industry code configuration for standardized jig and fixture compatibility
• Steel construction with 60 to 65 HRC hardness for extended wear life
• Inside diameter tolerance of +0.005/+0.014 mm for consistent tool guidance
• Flush-mount headless profile suits tight-clearance jig plate applications
• Meets ANSI standards for drill bushing geometry and dimensional accuracy

Compatibility

Designed as an OEM-style replacement or new-installation drill bushing for steel drill jig plates and fixture assemblies requiring a press fit headless HM-style bushing with a 6.75-inch inside diameter.

Installation Notes

Installation is performed by qualified machinists or toolmakers using an arbor press or hydraulic press to drive the bushing into a properly sized and toleranced jig plate bore. Power down all machinery and secure all workholding fixtures before pressing or removing bushings. Do not hammer the bushing in freehand, as this can cause misalignment or damage to the bore. Verify bore diameter and surface finish in the jig plate against the bushing outside diameter specification before pressing to ensure proper interference fit.