Hertel 79891081 Carbide Chucking Reamer Letter K

Product Description

The HERTEL 79891081 is a solid carbide chucking reamer sized to letter K, with a decimal diameter of 0.2810 inches. It is designed to finish-ream drilled or bored holes to a precise tolerance of 0.0000 to 0.0003 inches over nominal. The six-flute straight configuration provides stable cutting action and good chip clearance in through-hole and blind-hole applications. The bright, uncoated carbide construction delivers hardness and wear resistance suited to ferrous and non-ferrous materials. Machinists and toolroom technicians install this reamer in CNC machining centers, knee mills, and drill presses using a standard straight-cylindrical shank chuck or collet setup.

This reamer is used in precision machining operations where hole size accuracy and surface finish are critical. It is well suited for production reaming of dowel pin holes, bearing bores, and close-tolerance fit applications in metalworking shops and manufacturing environments. With an overall length of 3.25 inches and a flute length of 1.125 inches, it handles typical shallow-to-mid-depth hole requirements in a compact form factor. Right-hand cutting direction is standard for conventional spindle rotation.

Key Features

• Solid carbide construction for hardness and long tool life
• Letter K diameter (0.2810 inches) with tight tolerance of 0.0000 to 0.0003 inches
• Six straight flutes for smooth, stable cutting action
• Right-hand cut, straight-cylindrical shank for standard chuck or collet mounting
• Bright, uncoated finish — no coating buildup affecting final hole diameter
• Compact 3.25-inch OAL suitable for short-reach applications

Compatibility

Designed as an OEM-style chucking reamer for use in any machine spindle accepting a straight-cylindrical shank; compatible with standard drill press chucks, collet holders, and floating reamer holders sized to the shank diameter.

Installation Notes

Installation and operation should be performed by a qualified machinist familiar with reaming procedures. Power down and lock out the machine spindle before mounting or removing the tool. Ensure the shank is fully seated and the chuck or collet is properly torqued before operation. Use appropriate cutting fluid for the workpiece material to maintain tool life and achieve specified surface finish.