Hertel 79889978 Chucking Reamer 0.285 in Solid Carbide

Product Description

The HERTEL 79889978 is a solid carbide chucking reamer designed for precision hole finishing in metalworking and machining applications. With a reamer diameter of 0.285 inches and a diameter tolerance of 0.0000 to 0.0003 inches, this tool delivers tight, accurate bore sizing suitable for close-tolerance fits. The bright, uncoated solid carbide construction provides rigidity and wear resistance across a range of workpiece materials. Measuring 3.25 inches in overall length with a 1.125-inch flute length, the 79889978 is a compact tool suited for short-reach reaming operations on CNC machining centers, manual mills, and drill presses.

This chucking reamer is used in production and job-shop machining environments where consistent hole diameter and surface finish are required. The straight cylindrical shank allows it to seat securely in standard drill chucks, collet holders, and reamer holders. Typical applications include finishing drilled or bored holes in steel, cast iron, aluminum, and similar machinable metals where dimensional accuracy is critical. Machinists, toolmakers, and CNC operators are the primary users of this tool.

Key Features

• Solid carbide construction for superior rigidity and wear resistance compared to HSS alternatives
• 0.285-inch diameter with a tight tolerance of 0.0000 to 0.0003 inches for precise hole sizing
• 6-flute straight configuration for smooth cutting action and consistent chip evacuation
• Bright, uncoated finish suitable for use with cutting fluids across a variety of materials
• Straight cylindrical shank for compatibility with standard chucks and collet systems
• Right-hand cutting direction, consistent with conventional reaming practice

Compatibility

Designed as an OEM-style solid carbide chucking reamer for use with standard straight-shank reamer holders, drill chucks, and collet systems capable of accepting a 0.285-inch diameter straight shank tool.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom personnel familiar with rotating cutting tools. Ensure the machine spindle is fully stopped and locked out before mounting or removing the reamer. Seat the straight shank fully and evenly in the holder to prevent runout, and verify tool holding torque per the holder manufacturer's specifications. Use appropriate cutting fluid for the workpiece material to extend tool life and achieve optimal surface finish.