Precision Twist Drill 5997196 Taper Length Drill Bit 1/4

Product Description

The PRECISION TWIST DRILL 5997196 is a taper length, high-speed steel (HSS) drill bit designed for demanding production and maintenance drilling applications. It measures 0.2500 inches (1/4 inch, Letter E) in diameter with a 135-degree split point for self-centering entry and reduced walking on startup. The parabolic flute geometry, running 3-3/4 inches in length with a 6xD flute-to-diameter ratio, promotes efficient chip evacuation during deep-hole drilling. The bright/uncoated finish and web-thinned, tapered web configuration make this a heavy-duty general-purpose bit suited for use by machinists, maintenance techs, and fabricators working across a wide range of materials.

This drill bit performs across an extensive range of workpiece materials including alloy steel, carbon steel, stainless steel, hardened steel, tempered steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, copper, titanium, titanium alloy, magnesium, magnesium alloy, nickel, and graphite. Its taper length body — with an overall length of 6-1/8 inches — provides reach for applications where a jobber-length bit falls short. The straight, non-threaded shank diameter of 0.2500 inches seats in standard 1/4-inch chucks and collets. Series QC91P is built to ANSI standards for consistent dimensional accuracy.

Key Features

• 135-degree split point for self-centering, reduced-thrust drilling without a center punch
• Parabolic flute profile with 6xD ratio for fast chip evacuation in deep cuts
• Web-thinned, tapered web configuration reduces cutting resistance
• High-speed steel construction rated for heavy-duty general-purpose use
• Taper length body (6-1/8 inches overall) provides extended reach beyond standard jobber bits
• Built to ANSI standards; bright/uncoated finish compatible with a wide material range

Compatibility

Designed as a general-purpose taper length drill bit compatible with any standard drill press, milling machine, or hand drill accepting a 1/4-inch straight shank, and suitable for drilling alloy steel, aluminum, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, magnesium, malleable iron, nickel, stainless steel, tempered steel, and titanium workpieces.

Installation Notes

Installation and use should be performed by qualified machinists or trained maintenance technicians familiar with proper drilling practices. Secure the workpiece fully before beginning any drilling operation and ensure the shank is fully seated and tightened in the chuck or collet before applying power. Match spindle speed and feed rate to the workpiece material and bit diameter per standard machining references. Inspect the cutting edges and web before each use and replace the bit if chipping, excessive wear, or deformation is present.