Boneham P488JY Press Fit Headless Drill Bushing

Product Description

The BONEHAM P488JY is a press fit headless drill bushing designed to guide drill bits with precision in production drilling and machining operations. Classified under industry bushing code P, this bushing features a 25/64 inch inside diameter and a 3/4 inch outside diameter, with an overall length of 1/2 inch. Manufactured from steel, it is pressed directly into a jig plate or fixture without the use of a locking collar or head flange. The headless design sits flush with the plate surface, making it well suited for applications where a low-profile installation is required. Machinists and toolmakers install this type of bushing in drill jigs to maintain hole location accuracy across repeated production runs.

The P488JY fits residential and industrial machine shop applications where consistent drill guidance is needed in a jig plate or fixture. It is appropriate for light to medium production drilling setups where the bushing is pressed in permanently and not intended for removal. The inside diameter tolerance of positive 0.0001 to positive 0.0005 inches ensures a close fit on the drill or reamer shank, minimizing lateral movement during cutting. This bushing is not renewable, meaning it is intended for permanent installation rather than field replacement after wear.

Key Features

• Press fit installation - no locking collar or flange hardware required
• Headless design mounts flush with the jig plate surface
• Inside diameter tolerance of positive 0.0001 to positive 0.0005 inches for precise drill guidance
• Steel construction provides strength and wear resistance in production drilling environments
• 25/64 inch ID accepts standard fractional drill and reamer shanks of that size
• Compact 1/2 inch overall length suits thin jig plates and fixture assemblies

Compatibility

Designed as a permanent press fit installation bushing for use in drill jigs and machining fixtures requiring a 25/64 inch inside diameter and 3/4 inch outside diameter headless bushing per industry code P.

Installation Notes

Installation is performed by a machinist or tool and die professional using an arbor press or hydraulic press to seat the bushing flush into a precision-bored hole in the jig plate. The receiving hole in the plate must be machined to the appropriate interference fit tolerance to ensure the bushing is retained securely during drilling operations. Inspect the bore for burrs or contamination before pressing to avoid damaging the bushing or affecting alignment. Because this bushing is non-renewable, the jig plate must be re-bored and fitted with a new bushing if the original becomes worn.