Hertel MR34-0421.406 Chucking Reamer Wire 58 Solid Carbide

Product Description

The HERTEL MR34-0421.406 is a solid carbide chucking reamer designed for precision hole finishing in tight-tolerance machining applications. Built to wire gauge size 58, the reamer cuts to a nominal diameter of 0.0420 inches with a tolerance of 0.0000 to +0.0003 mm, making it suitable for work that demands consistent, repeatable hole geometry. The four-flute spiral configuration with a left-hand spiral direction and right-hand cutting action provides smooth chip evacuation and reduced chatter during the finishing pass. At 1.9685 inches overall length with a 10 mm flute length, this compact tool fits CNC machining centers and manual drill presses equipped with a standard straight cylindrical shank holder.

This reamer is used in production and job shop environments where small-diameter bores require a clean, accurate finish. Typical applications include precision instrument manufacturing, medical device components, and small mechanical assemblies where hole quality directly affects fit and function. The bright, uncoated carbide surface is well suited for non-ferrous metals and certain plastics where coating buildup could compromise dimensional accuracy. Machinists and toolroom technicians handling sub-0.05-inch diameter bores will find this tool appropriate for final sizing after drilling or boring operations.

Key Features

• Wire gauge size 58 cutting diameter of 0.0420 inches for small-bore precision finishing
• Solid carbide construction for rigidity and wear resistance in demanding materials
• Four-flute spiral geometry promotes smooth chip flow and consistent surface finish
• Left-hand spiral with right-hand cut reduces axial pull and aids chip clearance
• Tight diameter tolerance of 0.0000 to +0.0003 mm supports close-fit assemblies
• Bright uncoated finish suited to non-ferrous and abrasive-sensitive workpiece materials

Compatibility

Designed as a standard straight-shank chucking reamer compatible with drill chucks, collet holders, and floating reamer holders sized for small-diameter straight-shank tooling. No dowel pin or over/under size configuration.

Installation Notes

Installation and use of this reamer should be performed by a qualified machinist or toolroom technician. Secure the straight cylindrical shank fully in a properly sized collet or drill chuck before operation, and verify runout with an indicator before cutting. Spindle speed and feed rate should be selected per standard carbide reaming guidelines for the workpiece material. Inspect the cutting edges under magnification before use, as solid carbide is brittle and sensitive to improper handling or side loading.