Boneham AM00000172 Drill Bushing Hm 4.9mm Id Steel

Product Description

The BONEHAM AM00000172 is a press fit headless drill bushing designed to guide cutting tools with precision in jig and fixture applications. Manufactured from steel with a hardness rating of 60 to 65 HRC, this bushing resists wear through repeated drilling cycles. The inside diameter measures 4.9 mm, with an outside body diameter of 8.00 mm and an overall length of 8.00 mm. The headless HM-style profile seats flush with the jig plate surface, making it suitable for close-clearance setups where a flanged bushing would interfere. Machinists, toolmakers, and maintenance technicians install this bushing type in production and repair tooling environments.

This bushing is used in drill jigs and fixture plates across light manufacturing, maintenance, and toolroom applications. The press fit installation method locks the bushing permanently into the jig plate bore without additional fasteners. It is suited for residential shop work and industrial production environments where consistent hole location is required across multiple workpieces. The HM industry code designates the headless, non-renewable style, meaning it is intended as a permanent installation rather than a field-replaceable liner.

Key Features

• HM industry code headless style seats flush for low-profile jig configurations
• Steel construction with 60 to 65 HRC hardness for extended service life under repeated tooling cycles
• 4.9 mm inside diameter with a tolerance of +0.004 to +0.012 mm for accurate tool guidance
• 8.00 mm body outside diameter and 8.00 mm overall length for compact fixture integration
• Press fit installation method for permanent, fastener-free seating
• Meets ANSI standards for drill bushing geometry and dimensional accuracy

Compatibility

Designed as an OEM-style replacement or new-installation drill bushing for jig plates and fixture assemblies requiring a press fit headless HM-style bushing with a 4.9 mm inside diameter.

Installation Notes

Installation is performed by toolmakers or machinist trades using an arbor press or hydraulic press to seat the bushing flush into a correctly toleranced jig plate bore. The mating bore in the jig plate must be machined to the appropriate interference fit tolerance before pressing to prevent bushing distortion or cracking. Because the HM style is non-renewable, the jig plate bore should be inspected carefully before installation, as removal will likely damage the bushing. Always verify inside diameter clearance against the intended drill or reamer shank before pressing the bushing into service.