Hertel 72297112 Chucking Reamer Letter K 0.2810 in Hss

Product Description

The HERTEL 72297112 is a letter K chucking reamer designed for precision hole finishing in metal and other machinable materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers consistent sizing and smooth surface finishes in production and job-shop environments. The reamer features a 0.2810 inch cutting diameter, six right-hand spiral flutes, and a straight-cylindrical shank for secure chuck mounting. With an overall length of 4.25 inches and a flute length of 1.5 inches, this tool is suited for moderate-depth reaming operations on drill presses, lathes, and machining centers. Machinists and tool-and-die technicians are the primary users of this tool type.

This chucking reamer is appropriate for standard through-hole and blind-hole finish reaming in ferrous and non-ferrous workpieces. The right-hand spiral flute geometry promotes efficient chip evacuation during cutting, making it effective for higher-feed reaming passes where a straight-flute reamer may not clear chips as reliably. It is sized to the letter K designation, which corresponds to a decimal diameter of 0.2810 inches, falling within the 0.2500 to 0.2999 inch range. Typical applications include fixture and jig work, dowel-pin hole sizing, and close-tolerance bore finishing in general machining operations.

Key Features

• Letter K designation with 0.2810 inch decimal diameter for precise hole sizing
• Six right-hand spiral flutes for efficient chip evacuation and smooth finish
• HSS construction provides durability across a range of common workpiece materials
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• Bright, uncoated finish — suitable for use with cutting fluids appropriate to the workpiece material
• Right-hand cutting direction; not a dowel-pin or over/under-size reamer

Compatibility

Designed as a standard chucking reamer for use in drill presses, lathes, and CNC machining centers equipped with a chuck or collet capable of accepting a straight-cylindrical shank in the letter K diameter class.

Installation Notes

A licensed machinist or qualified tool operator should mount this reamer securely in a properly sized chuck or collet before use. Ensure the machine spindle is fully stopped before inserting or removing the tool. Apply an appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish quality. Pre-drill the hole to the correct pilot diameter before reaming — do not use this reamer to remove excessive stock.