Hertel 79891149 Chucking Reamer Letter Q Solid Carbide

Product Description

The HERTEL 79891149 is a solid carbide chucking reamer sized to Letter Q, equivalent to 0.3320 inches in diameter. It is designed for precision hole finishing in metal components, expanding or truing drilled or bored holes to tight dimensional tolerances. With a diameter tolerance of 0.0000 to 0.0003 inches, this reamer delivers consistent, accurate finished bores. The straight-flute, straight-shank configuration makes it compatible with standard drill chucks and collet systems. Machinists and tool-and-die professionals use this type of reamer on CNC machining centers, manual mills, and drill presses where hole finish and diameter accuracy are critical. At 0.13 pounds, it is a compact, balanced tool suitable for production and maintenance machining alike.

This chucking reamer is suited for through-hole and blind-hole finishing operations in steel, cast iron, aluminum, and similar machinable alloys. The solid carbide construction provides the rigidity and wear resistance needed for harder materials and higher-volume applications. The 6-flute design distributes cutting load evenly, producing a smooth bore surface finish. The straight shank allows direct mounting in standard drill chucks, collets, or tool holders without adapters. Typical applications include precision fixture bores, bearing seat finishing, and close-tolerance pin and bushing fits in manufacturing and repair environments.

Key Features

• Letter Q diameter (0.3320 inches) with a tight tolerance of 0.0000 to 0.0003 inches for precise bore finishing
• Solid carbide construction for superior rigidity and wear resistance compared to HSS alternatives
• 6-flute straight configuration distributes cutting forces and improves surface finish
• Straight cylindrical shank fits standard drill chucks, ER collets, and tool holders directly
• Bright uncoated finish suitable for use with most cutting fluids and coolants
• Right-hand cutting direction compatible with conventional CNC and manual spindle rotation

Compatibility

Designed as a standard chucking reamer for use in CNC machining centers, manual vertical mills, and drill presses equipped with standard straight-shank tool holders or drill chucks accepting a 0.3320-inch diameter tool.

Installation Notes

Installation and use should be performed by a qualified machinist. Secure the shank fully in a drill chuck, ER collet, or tool holder to the full grip depth before operation. Always apply appropriate cutting fluid for the workpiece material to extend tool life and improve bore finish. Inspect the reamer for chipping or wear before each use, as solid carbide tools can fracture if used in an out-of-true setup or run at incorrect feeds and speeds.