Precision Twist Drill 5997968 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997968 is a taper length drill bit designed for heavy-duty general purpose drilling across a wide range of metals and materials. Built from high speed steel with a bright/uncoated finish, it measures 0.1890 inches in diameter with a 6-inch overall length and a 3-5/8-inch flute length. The 135-degree split point promotes self-centering on contact, reducing walking and the need for a center punch on most surfaces. The parabolic flute geometry improves chip evacuation and allows for faster feed rates compared to standard flute configurations. Right-hand cut with a straight shank, this bit suits most standard drill chucks without adapters.

This bit is 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. The taper length body gives additional reach over jobber-length bits, making it well suited for deeper hole applications in fabrication, maintenance, and production environments. It is sold individually and carries an ANSI standard designation under the QC91P series.

Key Features

• 135-degree split point for self-centering entry without a pilot hole or center punch
• Parabolic flute design promotes aggressive chip clearing and reduced heat buildup
• High speed steel construction rated for heavy-duty use across ferrous and non-ferrous metals
• Taper length body provides additional reach over standard jobber-length bits
• Web-thinned, tapered web configuration reduces cutting resistance
• Straight shank fits standard drill chucks without a reducer or adapter

Compatibility

The QC91P series taper length drill bit is compatible with materials including alloy steel, aluminum, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, magnesium, malleable iron, nickel, stainless steel, tempered steel, titanium, and titanium alloys. Fits any standard drill chuck accepting a 0.1890-inch straight shank.

Installation Notes

Install in a standard keyed or keyless drill chuck rated for the intended application speed and torque. Secure the shank fully in the chuck before operation to prevent slippage and runout. Use appropriate cutting fluid or lubricant when drilling hardened steel, stainless steel, or titanium to extend tool life and maintain cut quality. Always wear appropriate eye protection and ensure the workpiece is firmly clamped before drilling.