Precision Twist Drill 5998017 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5998017 is a taper length drill bit in the QC91P series, designed for heavy-duty general-purpose drilling across a wide range of materials. Built from high-speed steel (HSS) with a bright/uncoated finish, it features a 135-degree split point and a parabolic flute geometry that clears chips efficiently and reduces heat buildup. The bit is sized at wire gauge 25, equal to 0.1495 inches in diameter, with a 3-inch flute length and an overall length of 5.375 inches. The straight cylindrical shank and right-hand cut make it compatible with standard drill chucks. Machinists, maintenance technicians, and fabricators commonly reach for this bit on production drilling tasks.

This bit is suited for right-hand drilling in both manual and machine setups, including drill presses, CNC machines, and hand-held power tools. Its taper length body provides added reach compared to a jobber-length bit, making it appropriate for deeper-hole applications. The parabolic flute and web-thinned, tapered web design improve self-centering on entry and reduce thrust requirements, which is particularly useful when drilling harder or layered materials. It carries ANSI standard compliance and is rated for general-purpose use across a broad material range.

Key Features

• Wire gauge 25 diameter, equal to 0.1495 inches, for precision-sized hole requirements
• 135-degree split point with web-thinning for self-centering entry and reduced thrust
• Parabolic flute geometry promotes fast chip evacuation and cooler cutting
• Taper length body at 5.375 inches OAL provides extra reach over standard jobber bits
• High-speed steel construction, bright/uncoated finish suitable for most material applications
• ANSI-compliant, heavy-duty grade with 6xD flute-to-diameter ratio

Compatibility

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. Fits any standard drill chuck accepting a straight cylindrical shank at 0.1495 inches.

Installation Notes

Install in a compatible drill chuck and confirm secure seating before operation. Power down or de-energize any machine tool completely before changing bits. Follow applicable shop safety standards and machine tool operating guidelines when setting spindle speed and feed rate for the target material. Do not exceed the rated cutting direction; this bit is designed for right-hand rotation only.