Boneham AM00000251 Drill Bushing Hm 7.25 in Id

Product Description

The BONEHAM AM00000251 is a press fit headless drill bushing manufactured to HM industry standards. It provides a hardened, precision guide for drill bits during machining operations, ensuring accurate hole placement and extended tool life. Made from steel, this bushing presses directly into a jig plate without a head flange, keeping the top surface flush with the workplate. The inside diameter measures 7.25 inches, with a body outside diameter of 12.00 millimeters and an overall length of 10.00 millimeters. Machinists, toolmakers, and fixture builders are the primary installers of this component.

This bushing is suited for use in drill jigs and fixture plates across production machining, fabrication shops, and toolroom applications. It is a non-renewable type, meaning it is designed for permanent or semi-permanent press-fit installation rather than field replacement during a run. Applications include repetitive drilling, reaming, and boring operations where consistent hole location is critical. The HM industry code designates the specific dimensional series, allowing straightforward selection against standard jig bushing references.

Key Features

• HM industry code designation for standardized sizing and interchangeability
• Press fit installation method for secure, flush-mount seating in jig plates
• Steel construction for hardness and wear resistance in repetitive drilling applications
• Headless design keeps the working surface of the jig plate unobstructed
• Non-renewable type suited for permanent fixture installations
• 7.25-inch inside diameter with 12.00-millimeter body outside diameter

Compatibility

Designed as an OEM-style replacement or new-installation drill bushing for standard HM-series jig and fixture plates requiring a press fit headless bushing with a 7.25-inch inside diameter.

Installation Notes

Installation is typically performed by a machinist or toolmaker using an arbor press to drive the bushing flush into a reamed jig plate bore. Ensure the receiving bore is machined to the correct interference fit tolerance for the bushing outside diameter before pressing. Do not use a hammer directly on the bushing face, as this can damage the bore geometry. Verify inside diameter clearance against the intended drill or reamer shank before committing the bushing to a permanent press fit.