Hertel 72308281 Chucking Reamer Wire Size 28 Cobalt Steel

Product Description

The HERTEL 72308281 is a straight-flute chucking reamer designed for precision hole finishing in metalworking applications. Built from cobalt steel with a bright, uncoated finish, this reamer produces accurate, smooth bores in ferrous and non-ferrous materials where tight tolerances are required. It carries a wire gauge size of 28, corresponding to a decimal diameter of 0.1405 inches, and falls within the 0.1000 to 0.1499 inch diameter range. The straight-cylindrical shank seats securely in standard drill chucks or collet holders. Overall length is 4 inches with a 1-inch flute length. Right-hand cutting direction is standard. Machinists and toolroom technicians are the primary installers of this reamer on lathes, drill presses, and machining centers.

This chucking reamer is suited for production and maintenance machining where wire-gauge holes must be reamed to close tolerances. Typical applications include finishing pre-drilled pilot holes in steel, aluminum, brass, and similar materials. The cobalt steel construction offers improved heat and wear resistance compared to standard high-speed steel, making it appropriate for tougher workpiece materials and higher-speed operations. The straight flute geometry works well in most general-purpose reaming scenarios where chip clearance is not a limiting factor.

Key Features

• Wire size 28 diameter — 0.1405 inches decimal equivalent for precise hole sizing
• Cobalt steel construction for improved wear and heat resistance over standard HSS
• Straight flute geometry suited for general-purpose reaming in a wide range of materials
• Bright, uncoated finish allows direct visual inspection of cutting edges before use
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• Right-hand cutting direction — standard orientation for conventional machine setups

Compatibility

Designed as an OEM-style chucking reamer for use in standard drill chucks, collet holders, and floating reamer holders on drill presses, lathes, and CNC machining centers accepting straight-cylindrical shanks in the 0.1405-inch diameter class.

Installation Notes

This reamer is installed by a machinist or toolroom technician using standard machine tool fixtures. Ensure the machine is fully powered down and the spindle is at rest before loading or removing the tool. Secure the straight-cylindrical shank firmly in the chuck or collet to prevent runout, which can damage the reamer or cause an out-of-tolerance bore. Use appropriate cutting fluid for the workpiece material to extend tool life and achieve the best surface finish.