Hertel 72309016 Chucking Reamer Letter a Cobalt Steel

Product Description

The HERTEL 72309016 is a cobalt steel chucking reamer designed to finish-size drilled holes to precise tolerances in metalworking applications. Built to Letter A sizing, this reamer produces a 0.2340-inch finished hole diameter. The straight flute geometry and bright uncoated cobalt steel construction handle a wide range of ferrous and harder alloy materials. At 6 inches overall length with a 1.5-inch flute length and a straight-cylindrical shank, this tool is designed for use in drill presses, lathes, and CNC machining centers where chuck or collet holding is standard. Right-hand cutting direction. Installed and operated by machinists and tool-and-die professionals.

This reamer is suited for production and maintenance machine shop environments where repeatable hole sizing is required. Typical applications include finishing pilot holes, aligning bores, and sizing holes for close-tolerance pin or shaft fits. The cobalt steel composition provides improved heat resistance over standard high-speed steel, making it appropriate for harder steels and stainless alloys where tool wear is a concern. The straight-cylindrical shank allows direct chucking in standard drill press or lathe setups without additional adapters.

Key Features

• Letter A diameter — finishes holes to 0.2340 inches
• Cobalt steel construction for improved heat and wear resistance over standard HSS
• Straight flute design for consistent chip evacuation in through-hole applications
• Bright uncoated finish — suitable for use with cutting fluid in most metal types
• Straight-cylindrical shank for direct chuck or collet mounting
• Right-hand cutting direction

Compatibility

Designed as an OEM-style chucking reamer for use in drill presses, engine lathes, and CNC machining centers equipped with standard drill chucks or collets that accept a straight-cylindrical shank.

Installation Notes

Chucking reamers are installed by machinists in drill press, lathe, or machining center spindles. Always ensure the workpiece and machine spindle are properly secured before operation. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole finish quality. Never use a reamer as a drill — always pre-drill to the correct undersize before reaming.