Boneham AM00000272 Drill Bushing Hm 7.7 in Id Steel

Product Description

The BONEHAM AM00000272 is a press fit headless drill bushing designed to guide drill bits and boring tools with precision in metalworking and machining applications. Manufactured from steel, this HM-industry-coded bushing installs permanently into a drill jig or fixture without a head flange, keeping the top surface flush with the jig plate. The inside diameter measures 7.7 inches, the body outside diameter measures 12.00 millimeters, and the overall bushing length is 10.00 millimeters. It is a non-renewable design, meaning it is pressed in and is not intended for routine field replacement. Machinists and toolmakers install this bushing as part of jig and fixture tooling setups requiring repeatable hole location accuracy.

This bushing is suited for production and job-shop environments where a permanent, flush-mount drill guide is required. It fits into a prepared jig plate bore and is pressed in place using an arbor press or similar equipment. The headless profile makes it appropriate for close-clearance drilling operations where a flanged bushing would interfere with workpiece positioning or clamping. It is typically installed by toolmakers, machinist tradespeople, or precision manufacturing technicians setting up drill jig assemblies.

Key Features

• Press fit installation method for permanent, secure seating in jig plate bores
• Headless (HM) design provides a flush top surface with no flange obstruction
• Steel construction for durability in repetitive drilling operations
• Inside diameter of 7.7 inches for precise drill or boring tool guidance
• Non-renewable design intended for long-service permanent fixture installations
• UNSPSC Code 31171603 for procurement and catalog classification

Compatibility

Designed as an OEM-style replacement or new-installation drill bushing for steel jig plates and fixtures requiring a press fit, headless HM-series bushing with a 7.7-inch inside diameter.

Installation Notes

Installation requires an arbor press or hydraulic press to seat the bushing flush and square into a properly sized jig plate bore. The bore in the receiving plate must be machined to the correct interference fit tolerance for the bushing outside diameter before pressing. Do not hammer the bushing directly without a driver to avoid damaging the bore or distorting the bushing. Always verify inside diameter clearance with the intended drill or tool before pressing the bushing permanently into the fixture.