Boneham H406JN Press Fit Headed Drill Bushing Steel

Product Description

The BONEHAM H406JN is a Type H press fit headed drill bushing manufactured from steel and hardened to 60 to 65 HRC for long service life in precision drilling applications. The bushing features an inside diameter of 0.368 inches with a tight tolerance of plus 0.0001 to plus 0.0005 inches, a body outside diameter of 0.625 inches, and a length under head of 0.375 inches. The head outside diameter measures 0.797 inches with a head height of 0.219 inches. This component is pressed directly into a drill jig or fixture plate and is not designed to be removed and replaced during normal use. Machinists, tool and die makers, and precision fabricators install this type of bushing to guide drill bits consistently across repeated operations.

The H406JN is suited for use in production drilling fixtures where a permanent, non-renewable bushing is required. It is appropriate for applications involving letter-size U drill bits. Typical installations include jig plates used in metalworking shops, assembly fixtures, and production tooling environments where hole location accuracy is critical. The press fit design eliminates movement under drill thrust loads, maintaining consistent hole placement across high-volume run production.

Key Features

• Press fit installation method — no locking hardware required
• Hardened steel construction at 60 to 65 HRC for wear resistance
• Inside diameter tolerance of plus 0.0001 to plus 0.0005 inches for precision drill guidance
• Headed design with 0.797 inch head OD seats flush against jig plate surface
• Non-renewable design for permanent fixture installations
• Conforms to ANSI standards

Compatibility

Designed for use with letter-size U drill bits (0.368 inch diameter) in press fit drill jig and fixture applications requiring a permanent headed bushing per ANSI standards.

Installation Notes

Installation is typically performed by a machinist or toolmaker using an arbor press to drive the bushing into a correctly sized and toleranced hole in the jig plate. The receiving hole in the fixture must be machined to the appropriate press fit tolerance to achieve proper retention. Do not use a hammer directly on the bushing head, as this can damage the seating surface or alter the bore geometry. Once installed, this bushing is not intended for removal or reuse.