Hertel 79889929 Chucking Reamer 0.255 in Solid Carbide

Product Description

The HERTEL 79889929 is a solid carbide chucking reamer designed for precision hole finishing in metal machining applications. With a reamer diameter of 0.255 inches and a tight tolerance of 0.0000 to 0.0003 inches, this tool delivers accurate, repeatable bore sizing in a single pass. The straight flute geometry and right-hand cutting direction make it suitable for through-hole and blind-hole reaming in a variety of ferrous and non-ferrous materials. At 3 inches overall length with a 1-inch flute length, the 79889929 fits standard drill chucks and collet holders. It weighs 0.05 pounds and ships individually.

This chucking reamer is intended for use in machine shop and production environments where close-tolerance hole finishing is required. Typical applications include CNC machining centers, drill presses, and manual milling machines. The straight cylindrical shank allows it to seat directly in a drill chuck or precision collet without the need for specialty toolholding. It is used by machinists, tool and die makers, and precision fabricators working to tight dimensional requirements on bored or drilled holes.

Key Features

• Solid carbide construction for wear resistance and dimensional stability
• Reamer diameter of 0.255 inches with a tolerance of 0.0000 to 0.0003 inches for precise bore sizing
• 4-flute straight flute design for smooth cutting action and chip clearance
• Bright/uncoated finish suitable for use in a range of materials without coating buildup concerns
• Straight cylindrical shank for direct chuck or collet mounting
• Right-hand cutting direction, compatible with standard machine spindle rotation

Compatibility

Designed as an OEM-style chucking reamer for use in drill chucks and collet holders accepting a straight cylindrical shank at the 0.255-inch nominal diameter range.

Installation Notes

Installation and use of this reamer should be performed by a qualified machinist. Secure the straight shank firmly in a precision collet or drill chuck before use, and verify runout with a dial indicator when close tolerances are critical. Always power down and lock out the machine spindle before changing tooling. Use appropriate cutting fluid for the workpiece material to extend tool life and achieve optimal surface finish.