Boneham P404JN Press Fit Headless Drill Bushing Steel

Product Description

The BONEHAM P404JN is a press fit headless drill bushing designed to guide cutting tools accurately during drilling, reaming, and boring operations. This P-series bushing features a 0.368 inch inside diameter and a 5/8 inch outside diameter, with an overall length of 1/4 inch. Machined from steel, it is installed without a head or collar, seating flush within the jig plate for applications where a low-profile footprint is required. Installation is permanent — this is not a renewable bushing. The precision bore holds an inside diameter tolerance of +0.0001 to +0.0005 inches, ensuring consistent tool guidance across production runs. Machinists and tool-and-die professionals install this bushing type in drill jigs and fixture plates.

This bushing is suited for use in drill jig fixtures across light manufacturing, machine shop, and production tooling environments. The headless press fit design makes it appropriate for jig plates where the bushing must sit flush with or below the plate surface. It accommodates Letter Size U drills as well as tools sized to 0.368 inches decimal. The 1/4 inch overall length suits thinner jig plates or applications where minimal tool overhang is required. No locking or liner bushing is needed for installation — the bushing is pressed directly into the jig plate bore.

Key Features

• 0.368 inch (Letter Size U) inside diameter with +0.0001 to +0.0005 inch tolerance for precise tool guidance
• 5/8 inch outside diameter for secure press fit seating in the jig plate bore
• 1/4 inch overall length suits thin jig plates and low-profile fixture applications
• Headless, flush-mount design eliminates interference above the plate surface
• Steel construction provides durability and wear resistance in repetitive drilling operations
• Non-renewable fixed installation — no liner bushing required

Compatibility

Designed as a standard P-series press fit headless drill bushing for use in drill jig and fixture plate applications requiring permanent bushing installation.

Installation Notes

Press fit drill bushings are installed by machinists or toolmakers using an arbor press or hydraulic press — never drive with a hammer, as this can damage the bore or distort the bushing. The jig plate bore must be machined to the correct interference fit tolerance before pressing in the bushing. Once installed, this bushing is considered permanent and is not designed for field removal or replacement. Verify bore alignment and cleanliness before pressing to seat the bushing squarely and fully.