Boneham AM00000134 Press Fit Headless Drill Bushing Hm

Product Description

The BONEHAM AM00000134 is a headless drill bushing designed for press fit installation in drill jigs and fixture plates. Classified under industry code HM, this bushing provides a hardened guide surface that controls drill bit alignment and reduces wander during precision hole operations. The inside diameter measures 3.9 inches, with a body outside diameter of approximately 0.276 inches (7.00 mm) and an overall length of approximately 0.472 inches (12.00 mm). Constructed from steel, it is suited for repetitive production drilling where consistent hole placement is required. Installation and replacement are handled by toolmakers, machinists, and fixture builders.

This bushing is applied in jig and fixture setups across metalworking, woodworking, and general manufacturing environments. Its headless profile allows the bushing to sit flush with the jig plate surface, making it appropriate for applications where a protruding flange would interfere with workpiece clamping or part travel. It is not a renewable bushing, meaning it is pressed directly into the jig plate bore and is intended as a fixed installation rather than a slip-renewable or lock-renewable type.

Key Features

• Press fit installation method for secure, flush-mount seating in jig plates
• HM industry code classification for standardized sizing and sourcing
• 3.9 inch inside diameter for drill bit guidance and alignment control
• Steel construction for durability in repetitive drilling operations
• Headless design eliminates flange interference with workpieces or clamps
• Non-renewable fixed-installation type for permanent fixture integration

Compatibility

Designed as a fixed press fit drill bushing for use in machined jig plates and fixture bodies where an HM-series headless bushing with a 3.9 inch inside diameter is specified.

Installation Notes

Press fit bushings are typically installed by machinists or toolmakers using an arbor press or hydraulic press to drive the bushing flush into a precision-reamed bore. Power to any associated machinery should be locked out before jig maintenance or bushing replacement. The receiving bore diameter must match the bushing outside diameter tolerance to ensure proper retention without distortion of the guide bore. Do not hammer bushings directly without a proper driver to avoid damage to the bushing or plate.