Hertel 72308315 Chucking Reamer Size 31 Cobalt Steel

Product Description

The HERTEL 72308315 is a straight-flute chucking reamer manufactured from cobalt steel for finishing drilled holes to a precise diameter. Sized to wire gauge 31, it produces a 0.1200-inch finished bore with consistent accuracy across production and maintenance applications. The bright, uncoated cobalt steel construction provides good heat resistance and edge retention when reaming ferrous and harder alloy materials. At 3.5 inches overall length with a 0.875-inch flute length and a straight-cylindrical shank, the tool mounts directly in drill chucks, collet chucks, or floating holders on drill presses, lathes, and CNC machining centers. Right-hand cutting direction follows standard reaming practice.

This reamer is suited for light-stock-removal finishing operations where a close-tolerance hole is required in metal fabrication, maintenance repair, and production machining environments. The straight-cylindrical shank allows secure clamping in standard drill chucks without the need for specialty toolholders. It is appropriate for use in both manual machine operations and low-to-moderate-speed CNC applications. Machinists and tool-room technicians working with wire-gauge-sized holes in the 0.1000-inch to 0.1499-inch decimal range will find this size category directly applicable.

Key Features

• Wire size 31 reamer producing a 0.1200-inch finished bore diameter
• Cobalt steel construction for improved heat and wear resistance over standard HSS
• Straight flute geometry for clean chip evacuation in through-hole and short blind-hole applications
• Bright uncoated finish — no coating buildup to affect dimensional tolerance
• Straight-cylindrical shank for direct chuck mounting without adapters
• Right-hand cutting direction compatible with standard machine spindle rotation

Compatibility

Designed as a standard chucking reamer for use in drill presses, engine lathes, turret lathes, and CNC machining centers equipped with drill chucks or collet holders accepting a straight-cylindrical shank.

Installation Notes

A licensed machinist or tool-room technician should verify spindle speed and feed rate are appropriate for the workpiece material before use. Power down and lock out the machine before mounting or removing the reamer from the holder. Secure the straight-cylindrical shank fully within the chuck jaws or collet to prevent pullout under cutting load. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore finish quality.