Hertel 79890661 Chucking Reamer Wire 31 Solid Carbide

Product Description

The HERTEL 79890661 is a solid carbide chucking reamer sized to wire gauge 31, with a decimal diameter of 0.1200 inches and a diameter tolerance of 0.0000 to 0.0002 inches. It features a straight flute geometry and a straight cylindrical shank, making it compatible with standard drill chucks and collet holders. Overall length is 2.25 inches with a flute length of 0.625 inches. The bright, uncoated carbide construction delivers consistent bore sizing in a range of materials. This reamer is intended for machinists and tool-and-die professionals who require tight, repeatable hole tolerances in production and maintenance applications.

This chucking reamer is suited for finish-reaming operations where hole size must be held to close tolerances. The 0.1200-inch diameter places it in the 0.1000 to 0.1499 inch diameter range, appropriate for small-diameter precision bores. Typical applications include aerospace components, hydraulic fittings, instrumentation housings, and similar work requiring controlled bore geometry. It is used in both manual and CNC machine setups. Right-hand cutting direction is standard for conventional spindle rotation. The straight flute design works well in through-holes and shorter blind bores with chip clearance access.

Key Features

• Solid carbide construction for rigidity and wear resistance in small-diameter reaming
• Wire size 31 designation, 0.1200 inch decimal diameter
• Diameter tolerance of 0.0000 to 0.0002 inches for tight bore control
• 4-flute straight geometry for consistent surface finish
• Bright, uncoated finish suitable for a broad range of workpiece materials
• Straight cylindrical shank for use in standard chucks and collet systems

Compatibility

Designed as an OEM-style chucking reamer for use in standard drill chucks, ER collet holders, and similar straight-shank toolholding systems capable of accepting a 0.1200-inch shank diameter.

Installation Notes

This reamer is installed and operated by machinists using drill presses, lathes, or CNC machining centers. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Secure the straight shank firmly in the collet or chuck to minimize runout, as excessive runout will degrade bore tolerance and tool life. Pre-drill or bore the hole close to final size before reaming to avoid overloading the flutes.