Hertel 72033947 Chucking Reamer 0.3940 in 6 Flute Hss

Product Description

The HERTEL 72033947 is a straight-flute chucking reamer designed for precision hole finishing in metal fabrication and machining applications. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers accurate final sizing on pre-drilled or bored holes. The reamer measures 0.3940 inches in diameter with a 7-inch overall length and a 1.75-inch flute length. Six straight flutes provide clean, consistent cutting action in right-hand rotation. The straight-cylindrical shank allows secure clamping in standard drill chucks, collet chucks, and machine spindles. Machinists and tool-and-die technicians use this reamer for close-tolerance hole work on manual mills, drill presses, and CNC equipment.

This chucking reamer suits general-purpose reaming operations on ferrous and non-ferrous metals where controlled hole diameter and surface finish are required. The 0.3940-inch diameter places it within the 0.3500 to 0.3999-inch reamer diameter range, making it appropriate for finishing holes in machine components, fixtures, and assemblies. Its HSS construction handles a wide range of workpiece materials at standard machining speeds without requiring specialized toolholding. Right-hand cutting direction is compatible with conventional machine spindle rotation in most shop environments.

Key Features

• 0.3940-inch finished-hole diameter for close-tolerance sizing
• 6 straight flutes provide smooth, chatter-resistant cutting action
• High-speed steel (HSS) construction for durability across common metal types
• Bright, uncoated finish suitable for use with standard cutting fluids
• Straight-cylindrical shank compatible with drill chucks and collet holders
• Right-hand cutting direction for standard machine spindle use

Compatibility

Designed as an OEM-style replacement or standard chucking reamer for use in drill presses, manual milling machines, and CNC machining centers equipped with drill chucks or collet chuck toolholding in the appropriate shank diameter.

Installation Notes

Installation is performed by qualified machinists or tool-and-die technicians. Secure the straight-cylindrical shank firmly in a drill chuck or collet before use, and confirm runout is within acceptable tolerance for the application. Always apply appropriate cutting fluid for the workpiece material to extend tool life and maintain hole finish quality. Ensure the machine spindle is fully stopped before loading or removing the reamer.