Boneham AM00000268 Drill Bushing Hm 7.6 in Id

Product Description

The BONEHAM AM00000268 is a press fit headless drill bushing in the HM industry classification, designed to guide drill bits with precision in metalworking and machining applications. Manufactured from steel with a hardness rating of 60 to 65 HRC, this bushing delivers the wear resistance required for repetitive drilling operations. The inside diameter is 7.6 inches, with a body outside diameter of 12.00 mm and an overall bushing length of 20.00 mm. It is installed by pressing directly into a jig plate without a head flange, keeping the bushing flush with the plate surface. Machinists and tool-and-die professionals rely on this type of bushing for consistent hole location across production runs.

This bushing is suited for use in drill jigs and fixtures in production machining environments, both in job shops and manufacturing facilities. It is a non-renewable bushing, meaning it is pressed permanently into the jig plate rather than being designed for routine field replacement. Typical applications include guiding standard twist drills and reamers where tight positional tolerances are required. The HM designation follows ANSI standards, making it a direct fit in tooling designed to that specification.

Key Features

• Press fit installation method for secure, permanent seating in jig plates
• HM industry code classification per ANSI standards
• Steel construction hardened to 60 to 65 HRC for extended wear life
• Inside diameter tolerance of +0.005/+0.014 mm for precise drill guidance
• Headless design sits flush with jig plate surface
• Non-renewable bushing intended for permanent installation

Compatibility

Designed as an ANSI-conforming HM-classification press fit headless drill bushing for use in standard drill jigs and fixtures requiring a permanently installed, flush-mount guide bushing.

Installation Notes

Installation is performed by a machinist or toolmaker using an arbor press to seat the bushing flush into a prepared jig plate bore. Verify bore diameter and finish before pressing to avoid bushing damage or improper fit. Once pressed in, this bushing is not designed for removal and reuse. Ensure the jig plate is properly supported during installation to prevent distortion.