Precision Twist Drill 5997145 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997145 is a taper length drill bit from the QC91P series, designed for demanding hole-making applications across a wide range of metals and alloys. Built from high-speed steel with a bright uncoated finish, it features a 135-degree split point and a parabolic flute geometry. The parabolic flute design improves chip evacuation and reduces cutting resistance, making it well suited for deep-hole drilling. The web-thinned, tapered web configuration reduces thrust at entry and supports self-centering starts without a center punch on many workpiece materials. Overall length is 3.75 inches with a 2-inch flute length, and the decimal diameter is 0.0760 inches corresponding to wire gauge size 48.

This taper length drill bit is used in machining, fabrication, and maintenance trades where standard jobber-length bits lack the reach needed for deeper bores. The QC91P series targets general-purpose heavy-duty drilling across a broad material range. The straight shank and 0.0760-inch shank diameter fit standard drill chucks and collet holders common in drill presses, CNC machining centers, and hand-held power drills. The 6xD flute-length-to-diameter ratio provides added reach compared to jobber-length equivalents while maintaining rigidity appropriate for small-diameter work.

Key Features

• Wire gauge size 48 with a decimal diameter of 0.0760 inches for precise small-hole applications
• 135-degree split point reduces walking and lowers required thrust at entry
• Parabolic flute geometry promotes fast chip clearance and reduces heat buildup during drilling
• Web-thinned, tapered web configuration supports self-centering starts
• High-speed steel construction handles a broad range of metals including stainless steel, hardened steel, titanium alloys, and cast iron
• Right-hand cut with straight shank fits standard chucks and collets without adapters
• Conforms to ANSI standards for taper length drill geometry

Compatibility

Rated for use in alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, magnesium, magnesium alloy, malleable iron, nickel, stainless steel, steel, tempered steel, titanium, and titanium alloy workpieces.

Installation Notes

This bit is installed and operated by machinists, toolroom technicians, and maintenance mechanics using standard drill presses, lathes, or hand-held power tools. Secure the straight shank fully in a properly sized chuck or collet before operation and verify runout before beginning a cut. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, particularly when drilling stainless steel or titanium alloys. Inspect the cutting edges and web for wear or chipping before each use, as small-diameter bits at this size are susceptible to breakage if fed too aggressively.