Precision Twist Drill 5997099 Taper Length Drill Bit 39

Product Description

The PRECISION TWIST DRILL 5997099 is a taper length drill bit from the QC91P series, designed for general-purpose drilling across a wide range of metals and engineered materials. Built from high-speed steel with a bright/uncoated finish, this bit features a 135-degree split point that reduces walking and allows self-centering entry without a pilot hole. The parabolic flute profile provides aggressive chip evacuation and reduces heat buildup during extended cuts. At wire gauge size 39 (0.0995 inches decimal), it handles precision-diameter holes in production and maintenance applications. Machinists, tool-and-die techs, and industrial maintenance professionals are the primary users of this bit.

This bit is suited for drilling alloy steel, carbon steel, stainless steel, cast iron, aluminum, aluminum alloy, brass, bronze, copper, magnesium, magnesium alloy, malleable iron, nickel, titanium, titanium alloy, hardened steel, tempered steel, and graphite. The taper length body — 2.5 inches of flute and 4.625 inches overall — gives additional reach compared to a standard jobber-length bit, making it a practical choice for deeper-hole work on drill presses, CNC machining centers, and manual mills where a longer reach is needed without stepping up to an extended-length bit.

Key Features

• 135-degree split point enables self-centering entry and reduces thrust force on entry
• Parabolic flute geometry promotes fast chip clearance and lower heat buildup
• Web-thinned, tapered web configuration improves cutting efficiency in tough materials
• High-speed steel construction rated for heavy-duty general-purpose use
• Straight shank fits standard drill chucks without an adapter
• Meets ANSI standards for dimensional consistency and interchangeability

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit for applications requiring a wire gauge size 39 (0.0995-inch diameter) hole in metal or engineered materials. Fits any standard drill chuck that accepts a straight shank at the listed shank diameter of 0.0995 inches.

Installation Notes

Installation and use should be performed by a qualified machinist or trained maintenance technician. Secure the workpiece and ensure the drill chuck is properly tightened before beginning a cut. Use appropriate cutting fluid or coolant when drilling stainless steel, titanium, or hardened steel to extend tool life, even though this bit does not support through-coolant delivery. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point shows damage that cannot be corrected by resharpening.