Hertel MR34-0760.406 Chucking Reamer 0.076 in Carbide

Product Description

The HERTEL MR34-0760.406 is a solid carbide chucking reamer designed for precision hole finishing in tight-tolerance machining applications. Built with a straight shank and a 0.076-inch diameter, this reamer features a 4-flute left-hand spiral geometry with right-hand cutting direction. The bright polished finish reduces friction and promotes clean chip evacuation. Overall length is 1.9685 inches with a flute length of 0.7087 inches, making it well suited for shallow finishing passes in small-diameter bores. Machinists and tool-and-die professionals working to close tolerances will find the controlled diameter tolerance of 0.0000 to +0.0003 mm critical for repeatable sizing.

This chucking reamer is used in CNC machining centers, drill presses, and manual mills where precise hole finishing is required. It is appropriate for production environments and job shop work where small-bore accuracy is critical. Wire gauge sizing at No. 48 identifies the target bore, fitting applications in instrument manufacturing, mold work, and precision component fabrication. The straight shank is compatible with standard chucks and collet holders commonly used in production machining setups.

Key Features

• Solid carbide construction for rigidity and wear resistance in small-diameter applications
• 4-flute left-hand spiral geometry with right-hand cutting direction for controlled chip flow
• Bright polished finish reduces friction and supports clean bore surface finish
• Diameter tolerance of 0.0000 to +0.0003 mm for tight, repeatable sizing
• Straight shank fits standard chucks and collet holders without modification
• Wire gauge No. 48 designation simplifies tool selection for standard bore charts

Compatibility

Designed as an OEM-style chucking reamer for use in standard straight-shank chuck and collet systems on CNC machining centers, drill presses, and manual mills requiring No. 48 wire gauge bore finishing.

Installation Notes

Installation and use of this reamer should be performed by a qualified machinist familiar with small-diameter cutting tools. Secure the straight shank firmly in a properly sized collet or drill chuck before use, and verify runout before beginning a finishing pass. Ensure spindle speed and feed rate are appropriate for solid carbide tooling in the workpiece material. Never force a chucking reamer through an undersized pilot hole, as this can cause tool breakage or bore damage.