Boneham P408IM Press Fit Headless Drill Bushing 5/16 in

Product Description

The BONEHAM P408IM is a press fit headless drill bushing manufactured from steel and hardened to 60 to 65 HRC for long service life in high-cycle drilling applications. With a 0.3125 inch inside diameter (5/16 inch nominal), a 5/8 inch body outside diameter, and a 1/2 inch overall length, this bushing installs flush with the jig plate surface to guide drill bits, reamers, or other cutting tools with precision. The inside diameter tolerance is held to plus 0.0001 to plus 0.0005 inches, providing the close fit required for accurate hole location. It carries a bushing industry code of P and conforms to ANSI standards. Machinists, toolmakers, and fixture builders rely on this type of bushing to maintain repeatable positional accuracy across production runs.

The P408IM is suited for use in drill jigs, fixture plates, and tooling setups where a permanent, non-renewable press fit installation is appropriate. The headless design sits flush with the work surface, making it a practical choice for applications where a flanged head would interfere with the workpiece or clamping arrangement. It is commonly installed in machine shops, tool rooms, and manufacturing environments handling medium to close tolerance drilling work.

Key Features

• Press fit installation method for permanent, rigid seating in jig plate bores
• Headless design sits flush with the plate surface - no flange interference
• 60 to 65 HRC hardness for wear resistance in repetitive drilling operations
• Inside diameter tolerance of plus 0.0001 to plus 0.0005 inches for accurate tool guidance
• ANSI-conforming dimensions for interchangeability with standard P-series bushings
• Non-renewable construction - intended as a fixed, long-term installation

Compatibility

Designed as an OEM-style replacement or new-installation P-series press fit headless drill bushing conforming to ANSI standards, suitable for standard jig plate applications requiring a 5/16 inch bore guide with a 5/8 inch outside diameter body.

Installation Notes

Installation is performed by toolmakers or machinists using an arbor press or hydraulic press to drive the bushing flush into a properly sized and finished jig plate bore. The receiving bore should be sized and finished to achieve the interference fit required for press fit bushings before installation. Once pressed in, this bushing is not designed for removal and replacement. Power down any associated machinery and secure all workholding fixtures before performing jig maintenance or bushing installation.