Hertel 2557387 Chucking Reamer 0.376 in Hss 6 Flute

Product Description

The HERTEL 2557387 is a straight-flute chucking reamer designed to finish-ream drilled or bored holes to a precise 0.3760-inch diameter. Manufactured from high-speed steel (HSS) with a bright, uncoated finish, this reamer delivers accurate sizing in a wide range of metals and materials. The straight-cylindrical shank is compatible with standard drill chucks and collet holders. With 6 flutes and right-hand cutting action, it produces clean, consistent hole walls in both through-hole and blind-hole applications. Overall length is 7 inches, and the flute length is 1.75 inches, making it well-suited for moderate-depth reaming tasks.

This chucking reamer is intended for use in machine shops, maintenance facilities, and production environments where tight hole tolerances are required. It is classified as an over/under size reamer, meaning it is ground to a specific diameter outside the nominal standard, allowing machinists to hit precise fit classes. Typical applications include reaming holes for pins, bushings, and precision fasteners in ferrous and non-ferrous workpieces. Installation is performed on drill presses, lathes, CNC machining centers, or manual milling machines using a floating reamer holder or rigid chuck setup.

Key Features

• 0.3760-inch finished hole diameter with over/under size designation for precise tolerance control
• 6 straight flutes with right-hand cutting direction for smooth, consistent surface finish
• HSS construction provides good wear resistance and toughness across a broad material range
• Bright, uncoated finish suitable for use with standard cutting fluids
• Straight-cylindrical shank for compatibility with drill chucks and collet holders
• 7-inch overall length with 1.75-inch flute length for controlled depth reaming

Compatibility

Designed as a machine chucking reamer for use in standard drill chucks, collet holders, and floating reamer holders on drill presses, lathes, and machining centers. Suitable for workpieces within the 0.3500 to 0.3999-inch reamer diameter range.

Installation Notes

This reamer is installed by a machinist or toolroom technician in a drill chuck, ER collet, or floating holder. A floating holder is recommended to allow the reamer to self-align with the existing hole and prevent bell-mouthing. Always apply an appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish. Ensure the machine spindle is at the correct RPM for the material and reamer diameter before engaging the cut.