Hertel MR34-0390.281 Chucking Reamer Wire 61 Solid Carbide

Product Description

The HERTEL MR34-0390.281 is a solid carbide chucking reamer designed for precision hole finishing in tight-tolerance machining applications. Built to wire size 61 (0.0390 inch diameter), this reamer features a spiral flute geometry with left-hand spiral direction and right-hand cutting action, which helps evacuate chips efficiently while maintaining surface finish quality. The straight shank allows direct mounting in standard drill chucks or collet holders. With a diameter tolerance of 0.0000 to +0.0003 mm, this tool is suited for applications demanding close bore control. It is a bright, uncoated tool intended for use in materials where carbide substrate performs without additional surface treatment.

This reamer is used in precision machining environments where small-diameter bore finishing is required. The 7 mm flute length and 50 mm overall length make it appropriate for shallow-to-moderate depth reaming passes on small features. Machinists working on instrument components, hydraulic valve bodies, medical device parts, or any application requiring repeatable small-bore diameters will find this tool suited to that work. The solid carbide construction supports use in harder workpiece materials and higher-speed operations compared to HSS alternatives.

Key Features

• Wire size 61 diameter (0.0390 inch) with tolerance of 0.0000 to +0.0003 mm for tight bore control
• Solid carbide construction for rigidity and wear resistance in demanding materials
• Spiral flute, left-hand helix with right-hand cut for efficient chip evacuation
• 4-flute design balances cutting load and surface finish quality
• Straight shank for compatibility with standard chucks and collet systems
• Bright uncoated finish suitable for applications where coating is not required

Compatibility

Designed as an OEM-style chucking reamer for use in standard straight-shank tool holders, drill chucks, and collet systems accepting small-diameter straight-shank tooling in CNC and manual machining setups.

Installation Notes

Installation and use of this reamer should be performed by qualified machinists familiar with small-diameter precision tooling. Ensure the spindle and work holding are fully secured and the machine is at a safe stop before mounting or removing the tool. Use appropriate cutting fluid for the workpiece material to extend tool life and protect bore finish. Avoid side loading or interrupted cuts that can chip carbide at this diameter.