Precision Twist Drill 5997416 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997416 is a taper length, straight-shank drill bit in the QC91P series, designed for heavy-duty metal drilling in professional shop and field applications. Measuring 5/16 inch (0.3125 inch) in diameter with a 6-3/8 inch overall length and a 4 inch parabolic flute, this bit delivers fast chip evacuation and reduced cutting resistance. The 135-degree split point provides self-centering entry without a center punch, and the bright/uncoated high-speed steel construction holds up across a broad range of ferrous and non-ferrous workpieces. It is installed by machinists, maintenance technicians, pipefitters, electricians, and other trades requiring precision hole drilling.

This bit is well suited for drilling alloy steel, carbon steel, stainless steel, cast iron, aluminum, brass, bronze, copper, titanium, magnesium, nickel, and tempered or hardened steel. The taper length format gives more flute depth than a jobber bit of the same diameter, making it the preferred choice when drilling deeper holes or working through structural stock. It fits any standard drill chuck or milling machine quill accepting a straight 5/16 inch shank. General-purpose performance rating makes it appropriate for production runs and maintenance repair operations alike.

Key Features

• 135-degree split point for self-centering entry — eliminates the need for a center punch on most materials
• Parabolic flute geometry with 6xD flute-to-diameter ratio for aggressive chip ejection and reduced heat buildup
• Web-thinned, tapered web configuration reduces thrust and improves cutting efficiency in tough alloys
• Bright/uncoated high-speed steel — compatible with cutting oils and coolants without coating adhesion concerns
• Straight shank fits standard three-jaw drill chucks and collet systems accepting 5/16 inch shanks
• Conforms to ANSI standards for taper length drill geometry and tolerances

Compatibility

Designed as an OEM-style taper length replacement drill bit for use in standard drill chucks and milling machine quills accepting a straight 5/16 inch shank. Rated for drilling 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 per manufacturer material application data.

Installation Notes

Install in a drill press, hand drill, or milling machine with a chuck rated for the shank diameter. Ensure the workpiece is securely clamped before drilling — never hand-hold metal stock. Power down and de-energize the machine before changing bits. Apply cutting fluid when drilling hardened steel, stainless steel, or titanium to extend bit life and manage heat.