Boneham H485JB Press Fit Headed Drill Bushing Steel

Product Description

The BONEHAM H485JB is a Type H press fit headed drill bushing manufactured from steel, designed to guide cutting tools with precision during drilling operations. It installs by press fit into a jig plate or fixture body and stays fixed for the life of the jig, making it a permanent bushing solution. The inside diameter measures 11/32 inches with a tight tolerance of +0.0001 to +0.0005 inches, ensuring consistent drill guidance. The body outside diameter is 3/4 inches and the length under the head is 5/16 inches. Tooling engineers, machinist, and fixture builders install this type of bushing during jig fabrication or maintenance.

The H485JB is suited for production drilling fixtures and jig plates in machine shops, fabrication facilities, and manufacturing environments where a non-renewable, permanently seated bushing is required. The headed design seats flush against the top face of the jig plate, preventing the bushing from being pushed through under axial drilling loads. This makes it appropriate for through-hole jig applications where the head acts as a positive stop during tool entry.

Key Features

• Press fit installation method — permanently seated into jig plate bore without additional fasteners
• Inside diameter of 11/32 inches with tolerance of +0.0001 to +0.0005 inches for precise drill guidance
• Body outside diameter of 3/4 inches and head outside diameter of 59/64 inches
• Length under head of 5/16 inches with head height of 7/32 inches
• Steel construction for durability in repeated drilling applications
• Non-renewable design — intended as a permanent bushing, not a field-replaceable liner

Compatibility

Designed as an OEM-style permanent press fit headed drill bushing for use in standard jig plates and drill fixtures requiring a Type H bushing configuration.

Installation Notes

Press fit bushings are installed by a machinist or tooling technician using an arbor press or hydraulic press — never drive them in with a hammer, as this can damage the bore or distort the bushing. The receiving bore in the jig plate must be machined to the correct press fit tolerance to achieve proper retention. Once installed, the H485JB is not intended to be removed or replaced. Ensure the fixture is secured and clear of personnel before beginning pressing operations.