Hertel MR34-0669.406 Chucking Reamer Wire 51 Solid Carbide

Product Description

The HERTEL MR34-0669.406 is a solid carbide chucking reamer designed for precision hole finishing in ferrous and non-ferrous materials. Sized to wire gauge 51, it cuts a nominal diameter of 0.0670 inches with a tolerance of 0.0000 to +0.0003 inches, making it suitable for close-tolerance bore work. The spiral flute geometry runs left-hand spiral with right-hand cutting direction, which helps clear chips away from the cutting zone and reduces surface chatter. At 1.9685 inches overall length with a 10 mm flute length, this compact tool is intended for shallow reaming operations. It is installed and used by machinists and toolroom technicians working on CNC machining centers, drill presses, and manual lathes.

This reamer is suited for production and toolroom environments where repeatable, tight-tolerance bore sizing is required. The straight shank makes it compatible with standard drill chucks and collet systems. Applications include finishing pilot holes, fitting dowel pins, and sizing holes for press-fit components in precision manufacturing. The solid carbide construction handles harder workpiece materials and higher cutting speeds compared to high-speed steel equivalents.

Key Features

• Wire gauge 51 diameter: 0.0670 inches with tolerance of 0.0000 to +0.0003 inches
• Solid carbide construction for wear resistance and dimensional stability
• Left-hand spiral flute with right-hand cutting direction for efficient chip evacuation
• 4 flutes for consistent surface finish in finished bores
• Bright (polished) coating for reduced built-up edge and smooth chip flow
• Straight shank fits standard chucks and collet holders without adapters

Compatibility

Designed as an OEM-style chucking reamer for use in standard straight-shank drill chucks and collet systems on CNC machining centers, drill presses, and manual lathes requiring wire gauge 51 bore sizing.

Installation Notes

Chucking reamers are installed by machinists and toolroom technicians. Ensure the workpiece and machine spindle are secured before beginning the operation. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore quality. Never use a reamer to remove excessive stock; pre-drill or bore the hole close to final size before reaming.