Precision Twist Drill 5999261 Drill Bit Wire 87 Hss

Product Description

The PRECISION TWIST DRILL 5999261 is a jobber-length drill bit sized to wire gauge 87, with a decimal diameter of 0.0100 inches. Built from high speed steel with a bright uncoated finish, it features a standard 118-degree split-point angle and a regular spiral flute with web thinning for improved chip evacuation and reduced thrust. The straight-cylindrical shank seats securely in standard drill chucks. At 0.75 inches overall length with a flute length of 0.0781 inches, this bit is engineered for precision small-diameter drilling in demanding materials. It is installed by machinists, tool-and-die technicians, and maintenance professionals requiring tight-tolerance hole work.

This bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. The 8xD flute-to-diameter ratio and tapered web configuration make it a general-purpose choice for applications requiring consistent, clean entry holes at very small diameters. It is commonly used in production drilling, instrument fabrication, and precision maintenance work where wire-gauge sizing is specified. No coolant-through capability is present, so standard cutting fluid applied externally is the typical practice for heat management in harder workpiece materials.

Key Features

• Wire gauge size 87 with 0.0100 inch decimal diameter for tight-tolerance applications
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Regular right-hand spiral flute promotes efficient chip clearance in short flute lengths
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI standards for jobber-length drill bit geometry and tolerances

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit in the R10P-R15P-R18P series, compatible with any standard drill chuck or collet sized to accept a 0.0100-inch straight-cylindrical shank.

Installation Notes

This bit is installed by machinists and maintenance technicians using a drill press, CNC machining center, or hand-held precision drill. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits for small-diameter tooling. Apply cutting fluid externally when drilling hardened steel, stainless steel, or superalloys to manage heat and extend tool life. Reduce feed pressure progressively as the bit approaches breakthrough to prevent deflection or breakage at this diameter.