Hertel 79890422 Chucking Reamer No.3 Solid Carbide 4 Flute

Product Description

The HERTEL 79890422 is a solid carbide chucking reamer in No. 3 wire size, with a decimal diameter of 0.2130 inches. It features a straight-cylindrical shank for secure chuck holding and four straight flutes with a right-hand cutting direction. The bright, uncoated carbide construction delivers consistent sizing performance in precision hole-finishing operations. With an overall length of 3 inches and a 1-inch flute length, this reamer is sized for short-reach applications requiring tight dimensional control. Machinists and tool-and-die professionals use this reamer to bring drilled or bored holes to final dimension with repeatable accuracy. The diameter tolerance of 0.0000 to 0.0002 inches supports close-tolerance fitment work.

This chucking reamer is suited for use in CNC machining centers, manual lathes, and drill presses where a floating or rigid chuck setup is employed. It is appropriate for finishing holes in steel, aluminum, and similar machinable materials where final hole diameter and surface finish are critical. The short flute length makes it practical for through-hole and shallow blind-hole reaming in production and job-shop environments. No. 3 wire size designation makes it a common selection when matching drilled pilot holes to close-tolerance pin or dowel fits.

Key Features

• Solid carbide construction for wear resistance and dimensional stability
• No. 3 wire size, 0.2130 inch diameter with tolerance of 0.0000 to 0.0002 inches
• Four straight flutes with right-hand cutting direction
• Bright, uncoated finish suitable for a wide range of base materials
• Straight-cylindrical shank compatible with standard drill chucks and collets
• 3 inch overall length with 1 inch flute length for short-reach precision work

Compatibility

Designed as an OEM-style chucking reamer for use in standard drill chucks and collet holders accepting a straight-cylindrical shank at No. 3 wire size diameter.

Installation Notes

Installation and use of this reamer should be performed by qualified machinists following established shop safety practices. Ensure the machine spindle is fully stopped and locked out before mounting or removing the tool. Secure the shank firmly in a compatible chuck or collet to minimize runout, which directly affects hole tolerance and tool life. Use appropriate cutting fluid for the workpiece material to extend reamer life and improve surface finish.