Precision Twist Drill 5998066 Drill Bit Wire 60 Hss

Product Description

The PRECISION TWIST DRILL 5998066 is a jobber-length drill bit sized at wire gauge 60, with a decimal diameter of 0.0400 inches. Manufactured from high speed steel with a bright uncoated finish, it features a standard 118-degree drill point angle and a two-flute spiral configuration with a regular spiral type. The overall length is 1.625 inches, and the flute length is 0.6875 inches, yielding a flute-to-diameter ratio of 17xD. The shank is straight-cylindrical at 0.0400 inches diameter. This is a general-purpose bit intended for bench drilling, drill presses, and hand-held power drills used by machinists, maintenance technicians, and metalworking tradespeople.

This bit is suited for drilling steel, cast iron, non-ferrous metals, superalloys, and titanium in light production and maintenance applications. The web-thinned, tapered-web construction reduces thrust at entry and improves chip clearance, making it well-suited for small-diameter work where control and precision matter. Right-hand cutting action is standard. The bit is part of the R10H-R18H series and conforms to ANSI standards, making it appropriate for general shop use where consistent tolerances are required.

Key Features

• Wire gauge 60 diameter — 0.0400 inches decimal equivalent
• 118-degree standard point angle with web-thinned, tapered-web geometry for reduced thrust
• High speed steel construction provides durability across steel, cast iron, non-ferrous metals, and superalloys
• Bright uncoated finish — compatible with a wide range of cutting fluids
• Regular spiral, two-flute design promotes efficient chip evacuation in small-diameter holes
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to ANSI specification designation

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks accommodating 0.0400-inch straight-cylindrical shanks. Part of the PRECISION TWIST DRILL R10H-R18H series. Primary workpiece material codes P, K, N, and S cover steel, cast iron, non-ferrous metals, and superalloys including titanium.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with small-diameter drill bit handling. Secure the shank fully in the drill chuck before operation and verify chuck runout to avoid bit deflection or breakage at this diameter. Power down or de-energize the drilling equipment fully before changing bits. Coolant-through is not supported; apply cutting fluid externally as appropriate for the workpiece material.