Boneham P3212HG Headless Drill Bushing 1/4 in Id Steel

Product Description

The BONEHAM P3212HG is a press fit headless drill bushing designed to guide drill bits and other cutting tools with precision in jig and fixture applications. Manufactured from steel and hardened to 60 to 65 HRC, this bushing resists wear through repeated drilling cycles. The headless design sits flush with the jig plate surface, making it well suited for applications where a protruding flange is not acceptable. The 0.25 inch inside diameter accepts standard E-size drill tooling, and the inside diameter tolerance of plus 0.0001 to plus 0.0004 inches ensures consistent, repeatable hole location. It conforms to ANSI standards and is sold as a non-renewable, permanently installed component.

This bushing is used in drill jigs and fixtures across metalworking, machining, and fabrication shops. Its press fit installation method holds the bushing firmly in a precisely bored hole in the jig body without fasteners or locking collars. Typical applications include production drilling, reaming, and light boring operations where hole-to-hole accuracy is critical. Machinists and toolmakers install this style of bushing during jig construction or when replacing a worn liner in an existing fixture.

Key Features

• Hardened steel construction at 60 to 65 HRC for extended wear life in high-cycle drilling
• Headless design sits flush with jig plate for clearance-sensitive setups
• Inside diameter tolerance of plus 0.0001 to plus 0.0004 inches for precise tool guidance
• Press fit installation requires no locking hardware — permanent, non-renewable design
• Meets ANSI standards for drill bushing dimensions and fitment
• Compact body: 0.5 inch outside diameter, 0.75 inch overall length

Compatibility

Designed as an ANSI-standard press fit headless drill bushing for use in jig plates and fixtures bored to accept a 0.5 inch outside diameter liner bore.

Installation Notes

Press fit drill bushings are installed by machinists and toolmakers using an arbor press or hydraulic press — never drive with a hammer directly on the bushing face. The receiving bore in the jig plate must be finished to the correct interference fit tolerance before installation. Once pressed in, this bushing is considered permanent and is not designed for field removal and reuse. Verify bore alignment and cleanliness before pressing to avoid galling the bushing or jig body.