Boneham PT125BJ Press Fit Headless Drill Bushing

Product Description

The BONEHAM PT125BJ is a press fit headless drill bushing designed to guide cutting tools with precision in jig and fixture applications. Manufactured from steel with a hardness rating of 60 to 65 HRC, this bushing resists wear under repeated drilling cycles. The inside diameter is 0.052 inches (Wire size No. 55) with a tolerance of +0.0001 to +0.0004 inches, ensuring close control over tool alignment. The body outside diameter is 0.1875 inches (3/16 inches) and the overall bushing length is 0.3125 inches (5/16 inches). It installs by press fit into a prepared bore and requires no head or locking collar. Machinists, toolmakers, and fixture builders work with this component in precision metalworking environments.

This bushing suits applications where a low-profile, headless design is required and the bushing must sit flush with or below the jig plate surface. Industry code P designates its press fit, non-renewable classification under standard jig bushing nomenclature. Typical use cases include production drilling jigs, assembly fixtures, and template guides in light to medium manufacturing. Because the bushing is not renewable, it is intended for permanent installation in the fixture plate for the life of the tool or fixture.

Key Features

• Press fit installation — no head or retaining collar required for a flush, low-profile mount
• Steel construction hardened to 60 to 65 HRC for wear resistance under repeated tool passes
• Inside diameter tolerance of +0.0001 to +0.0004 inches for precise tool guidance
• Headless design allows the bushing to seat fully below or flush with the jig plate surface
• Meets ANSI standards for jig bushing dimensions and tolerances
• Industry code P classification — non-renewable, permanent-install type

Compatibility

Designed as an ANSI-standard press fit headless drill bushing for use in machining jigs, drilling fixtures, and tooling plates requiring a No. 55 wire-size bore guide.

Installation Notes

Installation is performed by a machinist or toolmaker using an arbor press to drive the bushing into a properly reamed bore in the fixture plate. The receiving bore must be machined to the correct press fit tolerance to achieve proper retention — do not hammer the bushing in freehand. Because this is a non-renewable bushing, removal will damage either the bushing or the plate. Ensure the fixture plate is secured and supported squarely during pressing to prevent bore distortion.