Boneham P4012JN Press Fit Headless Drill Bushing

Product Description

The BONEHAM P4012JN is a press fit headless drill bushing designed to guide drill bits and cutting tools with precision in jig and fixture applications. With an inside diameter of 0.368 inches (Letter size U) and a body outside diameter of 5/8 inches, it presses directly into a drilled or reamed hole without requiring a retaining screw or head flange. The overall bushing length is 3/4 inches. Hardness is rated at 60 to 65 HRC, providing the wear resistance required for repetitive drilling operations. Machinists and toolmakers install this type of bushing when setting up production drilling jigs.

This bushing is suited for use in drill jigs, fixtures, and tooling plates where a flush or near-flush installation is required. The headless design keeps the bushing below or even with the jig surface, making it appropriate for close-tolerance work where a headed bushing would interfere with part seating or clamping. It is a non-renewable bushing, meaning it is pressed permanently into the jig plate rather than being field-replaceable. Typical users include machine shops, tool and die operations, and production floor maintenance teams working to ANSI standards.

Key Features

• Press fit installation — no set screw or locking collar required
• Headless design allows flush mounting in jig plates and fixtures
• Steel construction hardened to 60 to 65 HRC for long service life in high-cycle drilling
• Inside diameter tolerance of +0.0001 to +0.0005 inches for consistent tool guidance
• Meets ANSI standards for drill bushing dimensions and fit
• Non-renewable (permanent press fit) — suited for fixed-production tooling setups

Compatibility

Designed as an ANSI-standard press fit headless drill bushing for use in steel or cast-iron jig plates requiring a 5/8-inch reamed hole for installation.

Installation Notes

Installation is performed by machinists or tool and die technicians using an arbor press or hydraulic press to seat the bushing into a reamed hole. The receiving hole should be finish-reamed to match the bushing outside diameter tolerance for a proper interference fit. Once pressed in, this bushing is not intended for removal and reinstallation. Ensure all cutting equipment is de-energized and the workpiece is secured before pressing the bushing into position.