Hertel 72554389 Chucking Reamer 0.4385 in Cobalt Steel

Product Description

The HERTEL 72554389 is a chucking reamer designed for precision hole finishing in metalworking applications. Built from cobalt steel, it delivers the heat and wear resistance needed for harder workpiece materials and interrupted cuts. The tool measures 0.4385 inches in diameter with a 7-inch overall length and a 1.75-inch straight flute. The bright, uncoated finish is standard for cobalt tools intended for general-purpose reaming where a specific coating is not required. Right-hand cutting direction is standard. Machinists, tool-and-die makers, and maintenance technicians use this reamer to bring drilled or bored holes to a consistent, accurate final diameter.

This chucking reamer is suited for use in drill presses, lathes, and CNC machining centers where a straight-cylindrical shank is compatible with the holding device. It is classified as an over or under size reamer, making it appropriate for applications requiring a hole size that deviates slightly from standard. Typical applications include precision bore finishing in ferrous and harder non-ferrous materials in both job shop and production environments.

Key Features

• Cobalt steel construction for improved heat resistance compared to standard high-speed steel
• 0.4385 inch diameter with over or under size designation for non-standard bore finishing
• Straight flute geometry for clean cutting in through-holes and short blind applications
• Straight-cylindrical shank for direct chuck or collet holding
• Bright, uncoated finish — no coating buildup to affect dimensional accuracy
• Right-hand cutting direction, standard for conventional machine tool spindle rotation

Compatibility

Designed as an OEM-style chucking reamer for use in drill presses, engine lathes, turret lathes, and CNC machining centers equipped with chucks or collets accepting a straight-cylindrical shank in the 0.4385 inch diameter range.

Installation Notes

Installation is performed by machinists or toolroom technicians. Secure the straight-cylindrical shank firmly in a drill chuck or collet before use, and verify runout before cutting. Power down and de-energize the machine spindle before mounting or removing the reamer. Use appropriate cutting fluid for the workpiece material to maintain tool life and achieve target surface finish.