Precision Twist Drill 5998981 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5998981 is a taper length, straight-shank drill bit engineered for general-purpose drilling in a wide range of materials. Manufactured from high speed steel with a bright, uncoated finish, it measures 1.25 inches in diameter with an overall length of 12.5 inches and a flute length of 7.875 inches. The 118-degree standard point angle and web-thinned, tapered web configuration promote accurate starts and efficient chip evacuation. This bit is a working tool for machinists, maintenance technicians, and fabricators who need reliable performance in production or job-site environments.

The 5998981 is suited for drilling operations in both shop and field settings where a longer reach than a jobber-length bit is required. Its 6xD flute-to-diameter ratio makes it appropriate for deeper hole applications where standard-length bits fall short. The right-hand spiral flute and straight shank allow use in standard drill chucks and milling machine spindles. The bright finish makes it a straightforward choice where coating is not required by the application or material.

Key Features

• 1.25-inch diameter with 7.875-inch flute length for extended reach drilling
• High speed steel construction for general-purpose performance across a broad material range
• 118-degree standard point angle for versatile entry across ferrous and non-ferrous metals
• Web-thinned, tapered web reduces thrust and improves chip flow
• Straight shank fits standard drill chucks without special toolholders
• ANSI-standard Series R51 geometry for consistent, repeatable results

Compatibility

Designed for use in standard drill chucks and milling machine spindles that accept a 1.25-inch straight shank. Compatible materials include alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, cermet, copper, graphite, hardened steel, high strength bronze, magnesium, magnesium alloy, malleable iron, nickel, nickel alloy, reinforced plastic materials, and stainless steel.

Installation Notes

This bit is installed and serviced by machinists, tool-and-die technicians, and qualified maintenance personnel. Secure the straight shank firmly in a properly rated drill chuck or spindle before operation. Power down and lock out the machine before changing bits. Follow applicable shop safety standards and manufacturer guidelines for cutting speeds and feeds appropriate to the workpiece material.