Precision Twist Drill 5999220 Jobber Drill Bit Wire 78

Product Description

The PRECISION TWIST DRILL 5999220 is a jobber-length drill bit sized to wire gauge 78, equivalent to 1/64 inch (0.0160 inch decimal). It is manufactured from high speed steel with a bright, uncoated finish and features a standard 118-degree point angle with a web-thinned, tapered web for improved centering at the start of a cut. The spiral flute configuration is regular right-hand cut with two flutes, producing clean chip evacuation during drilling operations. With an overall length of 0.875 inches and a flute length of 0.1875 inches, this bit is suited for precision work in tight geometries. It belongs to the R18P series and meets ANSI standards.

This bit is intended for drilling in steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. It is used by machinists, tool and die technicians, electricians, and maintenance professionals requiring small-diameter precision holes. Typical applications include tapping pilot holes, instrument and control panel work, and fixture fabrication where wire gauge sizing is specified. The straight-cylindrical shank fits standard drill chucks and collets sized for 1/64-inch shanks.

Key Features

• Wire size 78 (1/64 inch, 0.0160 inch decimal) for precision small-diameter drilling
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• 118-degree standard point angle with web-thinned tapered web for accurate starting
• Two-flute regular spiral design promotes efficient chip clearance in deep-relative-to-diameter holes
• Bright uncoated finish — straightforward to inspect for wear and regrind as needed
• ANSI-conforming jobber-length geometry; straight-cylindrical shank fits standard chucks and collets

Compatibility

Designed as a general-purpose jobber-length drill bit for use in any standard drill press, CNC machining center, hand drill, or rotary tool equipped with a chuck or collet accepting a 1/64-inch straight-cylindrical shank. Compatible with workpiece materials coded P, M, K, N, and S per ISO material classification.

Installation Notes

This bit is installed by a machinist or qualified technician into a properly sized chuck or collet — verify the chuck capacity accepts the 1/64-inch shank diameter before tightening. Secure the workpiece firmly before drilling to prevent deflection at this diameter. Use cutting fluid appropriate for the workpiece material to extend bit life and improve hole finish when drilling steel or stainless steel. Maximum drilling depth for this bit is 0.1875 inches (3/16 inch); do not exceed this depth without retracting to clear chips.