Hertel 72300544 Chucking Reamer 27/32 in Cobalt Steel

Product Description

The HERTEL 72300544 is a cobalt steel chucking reamer designed to finish-ream drilled or bored holes to precise tolerances. With a 27/32-inch (0.8438 inches decimal) cutting diameter, a 2-1/2-inch straight flute length, and a 9-1/2-inch overall length, this reamer delivers accurate sizing in a single pass. The bright, uncoated cobalt steel construction provides heat resistance and durability when working in tough or work-hardening materials. The straight-cylindrical shank allows direct mounting in standard drill chucks, collets, or floating holders. This tool is installed and operated by machinists and tool-and-die professionals working on precision hole finishing operations in metalworking environments.

This chucking reamer is suited for precision reaming operations on ferrous and non-ferrous metals where tight hole tolerances are required. Typical applications include finish-reaming holes in fixtures, jigs, machine components, and structural parts. The right-hand cutting direction and straight flute geometry make it appropriate for through-holes and shallow blind-hole work where chip evacuation is straightforward. Its cobalt steel composition makes it a practical choice for materials that generate elevated cutting temperatures, such as stainless steel and high-strength alloys.

Key Features

• 27/32-inch (0.8438 inches) cutting diameter for precise hole sizing
• Cobalt steel construction for heat resistance in tough materials
• Straight flute design promotes smooth cutting and chip flow in through-holes
• Straight-cylindrical shank for compatibility with standard drill chucks and collets
• Bright, uncoated finish — no coating buildup to affect dimensional accuracy
• Right-hand cutting direction for conventional reaming operations

Compatibility

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

Installation Notes

A licensed machinist or toolroom professional should install and operate this reamer in a properly aligned machine spindle. Ensure the workpiece is securely clamped and the machine is at a complete stop before mounting or removing the tool. Use a floating holder when spindle-to-hole alignment cannot be guaranteed to avoid bell-mouthing or oversize conditions. Always apply cutting fluid appropriate for the workpiece material to extend tool life and improve surface finish.