Hertel 72291206 Chucking Reamer 5/16 in 6 Flute Hss

Product Description

The HERTEL 72291206 is a high-speed steel (HSS) chucking reamer designed to bring bored or drilled holes to a precise, finished diameter. Built with six straight flutes and a right-hand cutting direction, it removes controlled amounts of material to achieve tight dimensional tolerances. The reamer is classified as an over-size type, cutting to 0.3135 inches, making it suitable for applications that require a slightly enlarged hole beyond nominal 5/16-inch dimension. With a bright, uncoated finish, it is well suited for general-purpose metal finishing work in machine shops and field maintenance environments.

This chucking reamer is used in machine operations where a drill press, lathe, or milling machine holds the tool through a standard chuck. The straight-cylindrical shank provides secure, concentric grip in collet or drill chucks. It is appropriate for finishing holes in ferrous and non-ferrous metals in both production and repair settings. Machinists, toolroom technicians, and maintenance mechanics rely on this style of reamer when dimensional accuracy after drilling is critical.

Key Features

• HSS construction provides durability across a range of common shop metals
• Six straight flutes for smooth, controlled material removal
• Over-size cutting diameter of 0.3135 inches for precise allowance above nominal 5/16 inch
• Right-hand cutting direction compatible with standard machine rotation
• Bright, uncoated finish suited for general-purpose reaming without specialized lubrication requirements
• Straight-cylindrical shank for secure seating in drill chucks and collets

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, and milling machines equipped with a chuck or collet capable of accepting a straight-cylindrical shank in the 5/16-inch diameter class.

Installation Notes

This tool is installed by a machinist or toolroom technician into a suitable machine chuck or collet. Ensure the machine is fully powered down and the spindle is at rest before inserting or removing the reamer. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish. Never use a chucking reamer to remove excessive stock; pre-drill or bore the hole close to finished size before reaming.