Hertel 72556319 Chucking Reamer 0.3105 in Cobalt Steel

Product Description

The HERTEL 72556319 is a cobalt steel chucking reamer designed for precision hole finishing in machine shop and production environments. Built with 6 straight flutes and a right-hand cutting direction, this reamer delivers accurate sizing of drilled or bored holes to a finished diameter of 0.3105 inches. The straight-cylindrical shank allows direct mounting in drill chucks, collets, or floating holders on lathes, mills, and drill presses. Cobalt steel construction provides increased heat and wear resistance compared to standard high-speed steel, making it well suited for harder workpiece materials and higher-feed applications. Overall length is 6 inches with a flute length of 1.5 inches.

This chucking reamer is intended for use in general machining operations where a finished, close-tolerance bore is required. It is a dowel pin reamer, making it applicable for locating pin holes that demand tight dimensional accuracy. The bright, uncoated finish suits standard ferrous and non-ferrous materials across job shop and production floor use. Machinists, tool-and-die makers, and maintenance technicians working on manual or CNC machine tools are the primary users of this tool.

Key Features

• Cobalt steel construction for improved heat and wear resistance over standard HSS
• 0.3105 inch finished diameter for precise hole sizing
• 6 straight flutes with right-hand cutting direction for smooth, consistent stock removal
• Straight-cylindrical shank for compatibility with standard drill chucks and collets
• Dowel pin reamer designation for tight-tolerance locating hole applications
• Bright, uncoated finish — no coating buildup to affect final hole dimensions

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, mills, and CNC machining centers equipped with drill chucks, ER collets, or floating reamer holders accepting a straight-cylindrical shank.

Installation Notes

Chucking reamers are installed and serviced by machinists and tool-and-die professionals following standard machine tool lockout and tooling change procedures. Ensure the machine is fully powered down and the spindle is at rest before changing tooling. Use a properly sized collet or chuck to secure the shank without runout; excessive runout will cause oversize or bell-mouthed holes. Feed rate and cutting speed should follow the tool manufacturer guidelines for cobalt steel reamers and the specific workpiece material being machined.