Precision Twist Drill 5998971 1 in Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5998971 is a taper length, high speed steel drill bit designed for general-purpose drilling across a wide range of materials. It features a 1 inch diameter, a standard 118-degree split point, and a straight shank for compatibility with standard drill chucks. The overall length of 11 inches and a flute length of 6.375 inches give this bit the reach needed for deeper bores where jobber-length bits fall short. The bright uncoated finish suits general shop and field use. This bit is web-thinned for reduced thrust and cleaner entry, and the tapered web configuration adds rigidity along the flute length. It carries an ANSI standard designation and is built to Series R51 specifications.

This drill bit is suited for production and maintenance drilling in metalworking, fabrication, and general trade applications. The taper length format makes it a practical choice when standard jobber bits cannot reach the required depth, such as deep-hole work in structural steel, plate stock, or heavy-wall tubing. It is used by machinists, millwrights, pipe fitters, and maintenance technicians operating drill presses, magnetic base drills, and hand-held heavy-duty drills.

Key Features

• 1 inch diameter, taper length format for extended reach versus jobber-length bits
• High speed steel construction for durability across a broad material range
• 118-degree standard point angle with web thinning for reduced entry thrust
• 11 inch overall length with 6.375 inch spiral flute length
• Straight shank fits standard drill chucks without adapters
• Bright uncoated finish; right-hand cut; ANSI compliant; Series R51

Compatibility

Designed as a general-purpose taper length drill bit compatible with standard straight-shank drill chucks on drill presses, magnetic base drills, and heavy-duty hand drills. Suitable for drilling alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, high strength bronze, magnesium, magnesium alloy, malleable iron, nickel, nickel alloy, reinforced plastic materials, and stainless steel.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Secure the workpiece firmly before drilling and confirm the chuck is fully tightened on the straight shank before operation. Always wear appropriate eye protection and ensure the drill press or power tool is de-energized before changing bits. Do not exceed the recommended speed and feed rates for the material being drilled.