Hertel 2290278 Chucking Reamer 27/64 in Hss 6 Flute

Product Description

The HERTEL 2290278 is a straight-flute chucking reamer designed to finish-ream drilled or bored holes to a precise diameter of 0.4219 inches (27/64 inch). Built from high-speed steel (HSS) with a bright, uncoated finish, this reamer is suited for general-purpose machining operations where tight hole tolerances are required. The 6-flute configuration provides smooth cutting action and good surface finish in a wide range of workpiece materials. With a 7-inch overall length and a 1-3/4-inch flute length, it fits standard lathe chucks, drill presses, and milling machine setups. A straight-cylindrical shank ensures easy clamping in a variety of tool holders.

This chucking reamer is used in machine shop environments for finishing operations on drilled holes in ferrous and non-ferrous materials. Typical applications include production machining, toolroom work, and maintenance repair operations where hole diameter accuracy and finish quality are critical. The right-hand cutting direction is standard for conventional spindle rotation. It is sized for work requiring a finished hole diameter in the 0.4000 to 0.4999 decimal inch range, making it a common choice for bearing fits, pin fits, and precision bushing installations.

Key Features

• 27/64 inch (0.4219 inch) finished hole diameter for precise sizing
• High-speed steel (HSS) construction for durability across a range of materials
• 6 straight flutes provide smooth cutting action and consistent surface finish
• Bright, uncoated finish suitable for general-purpose and light production use
• Straight-cylindrical shank for easy clamping in chucks and collets
• Right-hand cutting direction compatible with standard machine spindle rotation

Compatibility

Designed as a standard chucking reamer for use in lathes, drill presses, and milling machines equipped with a chuck or collet capable of holding a straight-cylindrical shank. Verify that the machine spindle rotates right-hand before use.

Installation Notes

Chucking reamers are installed and operated by machinists using standard machine tools. Ensure the workpiece is securely fixtured and the machine spindle is powered off and at a full stop before mounting or removing the tool. Use appropriate cutting fluid for the workpiece material to extend tool life and improve hole finish. Do not use a chucking reamer to remove excessive stock; pre-drill or bore the hole close to final size before reaming.