Hertel 72309156 Chucking Reamer Letter O 6 in Cobalt

Product Description

The HERTEL 72309156 is a chucking reamer designed for precision hole finishing in metalworking applications. Ground to a Letter O diameter of 0.3160 inches, this reamer is manufactured from cobalt steel for improved hardness and heat resistance compared to standard high-speed steel. The straight flute geometry and bright uncoated finish suit it for use in a wide range of ferrous and non-ferrous materials. With an overall length of 6 inches and a 1.5-inch flute length, the tool is sized for use in manual or CNC chucking setups where consistent bore sizing and surface finish are required.

This chucking reamer is intended for machine-tool use in job shop, production, and maintenance environments. It is suited for sizing holes that have been pre-drilled or bored to near-final diameter. The straight-cylindrical shank allows direct mounting in drill chucks, collet chucks, or floating reamer holders. Right-hand cutting direction is standard for conventional spindle rotation. Machinists, toolmakers, and maintenance technicians working in fabrication, tooling, or repair applications are the typical end users of this style of reamer.

Key Features

• Letter O diameter: 0.3160 inches, falling within the 0.3000 to 0.3499 inch decimal range
• Cobalt steel construction for elevated heat resistance and tool life in harder materials
• Straight flute design for smooth cutting action and easier chip evacuation in through-hole applications
• Bright uncoated finish — ready to use as ground, without additional surface treatment
• Straight-cylindrical shank for direct mounting in standard chucking setups
• Right-hand cutting direction for use with conventional spindle rotation

Compatibility

Designed as an OEM-style chucking reamer for use in machine-tool applications requiring a Letter O diameter bore finish with a straight-cylindrical shank interface.

Installation Notes

Installation and use of this reamer should be performed by a qualified machinist or toolmaker. Ensure the machine spindle is fully stopped and the tool is securely clamped in the holder before starting the cut. Use appropriate cutting fluid for the workpiece material to maximize tool life and hole finish quality. Follow standard shop practices and applicable safety codes when operating machine tools.