Precision Twist Drill 5998400 Jobber Drill Bit No 39

Product Description

The PRECISION TWIST DRILL 5998400 is a jobber-length twist drill bit sized to wire gauge No. 39, with a decimal diameter of 0.0995 inches. Made from high speed steel with a steam oxide coating, it is built for general-purpose drilling in metal fabrication, maintenance, and light industrial applications. The bit features a 118-degree standard point angle, a right-hand spiral flute, and a straight cylindrical shank. Overall length is 2.375 inches, with a 1.375-inch flute length. Licensed HVAC technicians, plumbers, electricians, and general tradespeople commonly reach for jobber-length bits like this one when drilling pilot holes or clearance holes in steel and other metal workpieces.

This bit is suited for drilling into steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It fits standard drill chucks that accept a 0.0995-inch straight cylindrical shank. With a 14xD flute-to-diameter ratio and a maximum drilling depth of 1.375 inches, it handles typical through-hole and blind-hole tasks in sheet metal, structural steel, and mechanical assemblies. The R18 series designation indicates it meets ANSI standards for jobber-length geometry.

Key Features

• Wire gauge No. 39 size — 0.0995 inches decimal diameter
• 118-degree standard point angle for general-purpose metal drilling
• Steam oxide coating reduces friction and provides mild corrosion resistance
• Right-hand cut with regular spiral, 2-flute design for efficient chip evacuation
• Web-thinned, tapered web configuration reduces entry force in harder materials
• Meets ANSI specifications — Series R10-R15-R18

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck or drill press accepting a 0.0995-inch straight cylindrical shank. Rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium per the manufacturer workpiece material classifications P, M, K, N, and S.

Installation Notes

Install in a hand drill, drill press, or other rotating tool with a chuck rated for the 0.0995-inch shank diameter. Secure the workpiece before drilling and verify the chuck is fully tightened. Apply cutting fluid when drilling stainless steel, superalloys, or titanium to manage heat and extend tool life. This bit does not support coolant-through operation.