Hertel 79889838 Chucking Reamer 0.249 in Solid Carbide

Product Description

The HERTEL 79889838 is a solid carbide chucking reamer designed for precision hole finishing in machining applications. With a reamer diameter of 0.249 inches and a tight diameter tolerance of 0.0000 to 0.0002 inches, this tool delivers accurate, repeatable bore sizing in production and job-shop environments. It features a straight flute geometry and a straight cylindrical shank for secure chuck mounting. The 3-inch overall length and 1-inch flute length suit a range of through-hole and shallow blind-hole finishing operations. Machinists and CNC operators use this reamer where consistent bore geometry and surface finish are critical requirements.

This reamer is classified as an undersize reamer, with a listed undersize designation of 0.2490 U/S, making it well-suited for applications requiring a close undersize fit or press-fit bore preparation. The right-hand cutting direction is compatible with standard CNC machining centers, knee mills, and drill presses. It performs in ferrous and non-ferrous materials where solid carbide tooling provides the rigidity and wear resistance needed to hold tight tolerances over extended production runs.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding machining applications
• Reamer diameter of 0.249 inches with a tolerance of 0.0000 to 0.0002 inches for precise bore sizing
• Undersize designation of 0.2490 U/S for press-fit and close-tolerance bore preparation
• Straight flute design with 4 flutes for smooth cutting action
• Bright/uncoated finish suitable for use with standard cutting fluids
• Right-hand cutting direction compatible with standard machine setups

Compatibility

Designed as a straight-shank chucking reamer for use in standard drill chucks, collet chucks, and CNC tool holders accepting a cylindrical shank. No specific OEM system compatibility was stated in the product data.

Installation Notes

Installation and use of this reamer should be performed by a qualified machinist. Secure the straight cylindrical shank firmly in a drill chuck or collet before operation and verify runout is within acceptable limits before cutting. Always apply appropriate cutting fluid for the workpiece material to maximize tool life and bore finish quality. Do not exceed the tool manufacturer's recommended speeds and feeds for solid carbide reamers in the material being machined.