Hertel 72308521 Chucking Reamer Wire 52 Cobalt Steel

Product Description

The HERTEL 72308521 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. It carries a wire gauge designation of Number 52, corresponding to a decimal diameter of 0.0635 inches. Overall length is 3.0 inches with a flute length of 0.5 inches. The straight-cylindrical shank seats securely in standard drill chucks and collets. With four right-hand cutting flutes, it delivers consistent stock removal and a quality finish in production and maintenance machining environments. Machinists and toolroom technicians are the primary installers.

This reamer is suited for light-duty reaming operations where close-tolerance hole sizing is required. The wire size Number 52 diameter places it in the 0.0500 to 0.0999 inch range, making it appropriate for small-bore work in jig and fixture assembly, precision component manufacturing, and maintenance repair operations. The cobalt steel construction gives it added heat resistance compared to standard high-speed steel, making it a practical choice when reaming harder alloys or when tool life in production runs is a concern. It is not configured as a dowel pin reamer or an over/under size reamer.

Key Features

• Wire gauge Number 52 diameter — 0.0635 inches decimal equivalent
• Cobalt steel construction for improved heat resistance and tool life over standard HSS
• Four straight flutes with right-hand cutting direction
• Bright, uncoated finish — ready for use as supplied
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Not a dowel pin or over/under size reamer — designed for standard close-tolerance finishing

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, CNC machining centers, and hand-held air or electric drill motors equipped with a chuck or collet capable of accepting a straight-cylindrical shank in the 0.0635-inch diameter class.

Installation Notes

Chucking reamers are installed and operated by machinists and toolroom technicians. Ensure the workpiece is securely fixtured and the machine spindle is powered down and at a full stop before loading or removing the tool. Use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality. Inspect the shank and flutes for chips or damage before each use, and do not force the reamer through an undersized hole — proper pre-drill sizing is essential for accurate results.