Boneham H324ID Press Fit Headed Drill Bushing Type H

Product Description

The BONEHAM H324ID is a Type H press fit headed drill bushing designed to guide drill bits and cutting tools with precision in jig and fixture applications. Machined from steel, this bushing features an inside diameter of 0.295 inches with a tight tolerance of +0.0001 to +0.0005 inches, ensuring accurate, repeatable hole location across production runs. The headed design provides a positive stop against the jig plate surface, and the bushing installs by press fit without requiring a locking mechanism or separate retainer. It is a permanent, non-renewable installation intended for fixed production tooling setups.

This bushing is suited for use in drill jigs, fixture plates, and tooling bodies where consistent hole placement is required across multiple workpieces. Typical applications include metal fabrication shops, machining operations, and assembly tooling where guide bushings are pressed in permanently. The 0.295-inch inside diameter corresponds to industry letter size M, and the 0.25-inch length under head makes it appropriate for use with standard jig plate thicknesses in light to medium-duty production work.

Key Features

• Press fit installation — no locking collar or retainer required
• Inside diameter: 0.295 inches (letter size M) with +0.0001 to +0.0005 inch tolerance
• Headed (Type H) design seats flush against jig plate for repeatable drill depth reference
• Body outside diameter: 0.5 inches; head outside diameter: 0.609 inches (39/64 inches)
• Length under head: 0.25 inches (1/4 inches) for standard plate thickness fitment
• Steel construction for durability in production drilling environments
• Non-renewable design — permanently installed in tooling fixture

Compatibility

Designed as a permanent press fit replacement or original installation bushing for drill jigs and fixture plates requiring a Type H headed bushing with a 0.295-inch inside diameter and 0.5-inch body outside diameter.

Installation Notes

Installation is performed by machinists or tooling technicians using an arbor press or hydraulic press to seat the bushing flush into a pre-reamed jig plate bore. The receiving bore in the fixture plate must be machined to the correct interference fit tolerance for the 0.5-inch body outside diameter before pressing. Once installed, this bushing is not intended to be removed or replaced. Ensure the jig plate material and bore finish meet tooling specifications before press fitting to avoid bushing damage or improper seating.