Boneham H204EF Press Fit Headed Drill Bushing

Product Description

The BONEHAM H204EF is a Type H press fit headed drill bushing used to guide drill bits and other cutting tools with precision in jig and fixture applications. It features a 0.1405 inch inside diameter (equivalent to a Number 28 wire gauge drill) and a 5/16 inch body outside diameter, with an inside diameter tolerance of +0.0001 to +0.0004 inches for tight positional accuracy. The head design keeps the bushing seated flush against the jig plate during use. Machined from steel, this bushing is installed permanently by press fit and is not designed for field renewal or exchange. Toolmakers, jig builders, and machine shop technicians are the primary installers.

This bushing is suited for use in drill jigs, fixture plates, and production tooling where consistent hole location is required across repeated operations. Its headed style makes it appropriate for applications where a positive stop against the jig plate surface is needed to control depth and prevent migration under load. The 1/4 inch length under head accommodates standard jig plate thicknesses commonly found in light to medium production environments. It is typically used in metalworking, fabrication shops, and precision machining settings.

Key Features

• Type H headed press fit design provides a positive stop against the jig plate surface
• 0.1405 inch inside diameter fits Number 28 wire gauge drill size
• Inside diameter tolerance of +0.0001 to +0.0004 inches for accurate tool guidance
• Steel construction for durability in repeated drilling operations
• 1/4 inch length under head suits standard jig plate thicknesses
• Non-renewable design for permanent installation in fixed tooling

Compatibility

Designed as an OEM-style press fit headed drill bushing for use in standard drill jig and fixture applications requiring a Number 28 wire gauge tool guide.

Installation Notes

Press fit bushings are installed by toolmakers or machinist personnel using an arbor press or hydraulic press to seat the bushing flush into the prepared jig plate bore. The receiving bore must be machined to the correct interference fit tolerance before installation. Always de-energize and lock out any machine tool before servicing or replacing drill jigs containing these bushings. Once pressed in, this bushing is not intended for removal or reuse.