Hertel 79890992 Chucking Reamer Letter B Solid Carbide

Product Description

The HERTEL 79890992 is a solid carbide chucking reamer designed for precision hole finishing in machining applications. Ground to a Letter B diameter of 0.2380 inches with a diameter tolerance of 0.0000 to 0.0002 inches, this reamer delivers the tight bore accuracy required in production and toolroom environments. The four-flute, straight-flute geometry provides a smooth cutting action on right-hand rotation. At 3 inches overall length with a 1-inch flute length and a straight cylindrical shank, it is suited for use in CNC machining centers, drill presses, and manual lathes. Licensed machinists and toolroom technicians are the primary users.

This chucking reamer is applied in precision bore sizing operations where a drilled or bored hole must be brought to a tight dimensional tolerance. Typical applications include fixture and jig work, bushing installation prep, and close-tolerance production runs in steel, cast iron, aluminum, and similar machinable materials. The bright, uncoated finish makes it well suited for use with cutting fluids common in these operations.

Key Features

• Letter B diameter (0.2380 inches) with a tolerance of 0.0000 to 0.0002 inches for precision bore finishing
• Solid carbide construction for rigidity and wear resistance in hard or abrasive materials
• Four straight flutes with right-hand cutting direction for smooth, chatter-reduced reaming
• Straight cylindrical shank for secure chuck or collet mounting
• Bright, uncoated finish compatible with a wide range of cutting fluids
• Compact 3-inch overall length keeps tool deflection minimal in short-reach setups

Compatibility

Designed as a standard chucking reamer for use in any machine tool equipped with a drill chuck or collet capable of accepting a straight cylindrical shank at the Letter B diameter class.

Installation Notes

Installation and use should be performed by a qualified machinist following standard shop safety procedures. Ensure the machine spindle is fully stopped and the tool is securely clamped in the chuck or collet before beginning the operation. Pre-drill or bore the hole to the appropriate undersize before reaming to achieve the specified tolerance. Use adequate cutting fluid for the workpiece material to extend tool life and maintain bore finish quality.