Hertel 2412278 Chucking Reamer 27/64 in 8 Flute Cobalt

Product Description

The HERTEL 2412278 is a chucking reamer designed for precision hole finishing in metal machining applications. Built from cobalt steel with a bright, uncoated finish, it delivers the hardness and heat resistance required for reaming ferrous and harder alloy materials. The reamer measures 0.4219 inches (27/64 inch) in diameter with an overall length of 7 inches and a 1-3/4 inch flute length. Eight right-hand spiral flutes provide smooth chip evacuation and a clean, accurate bore finish. The straight-cylindrical shank seats directly into drill chucks, collets, or machine tool holders for quick setup on lathes, drill presses, and machining centers.

This chucking reamer is suited for production and job-shop environments where consistent hole sizing and surface finish are required. It is a standard-size tool appropriate for through-hole and blind-hole finishing operations in steel, cast iron, and similar materials. The 27/64 inch diameter falls within the 0.4000 to 0.4999 decimal inch reamer diameter range, making it a common selection for precision fit applications in mechanical assembly and fabrication work. Machinists and tool-and-die professionals are the primary installers and users of this tool.

Key Features

• Cobalt steel construction for elevated heat and wear resistance compared to standard HSS
• Eight right-hand spiral flutes for efficient chip removal and smooth bore finish
• Bright, uncoated finish suitable for general-purpose reaming operations
• Straight-cylindrical shank for direct chuck or collet mounting
• Standard 27/64 inch diameter for precise hole sizing to nominal fit specifications
• Right-hand cutting direction compatible with standard machine tool spindle rotation

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, and CNC machining centers equipped with drill chucks or collet holders accepting a straight-cylindrical shank in the applicable diameter range.

Installation Notes

This tool is installed and operated by machinists in machine shop environments. Always power down and lock out the machine spindle before mounting or removing the reamer from the chuck or collet. Ensure the shank is fully seated and the chuck or collet is properly tightened before operation. Use appropriate cutting fluid for the material being reamed to extend tool life and maintain bore finish quality.