Precision Twist Drill 5995495 Jobber Drill Bit 31/64

Product Description

The PRECISION TWIST DRILL 5995495 is a jobber-length drill bit designed for general-purpose drilling in steel, cast iron, and similar ferrous and non-ferrous materials. Built from high-speed steel (HSS) with a bright, uncoated finish, this bit features a 118-degree standard point angle and a left-hand cutting direction, making it suited for applications where conventional right-hand tooling cannot be used. The Series L10 design includes a web-thinned, tapered web configuration that reduces thrust load at the point. With an overall length of 5.875 inches and a straight shank diameter of 0.4844 inches, it mounts directly in standard drill chucks without adapters.

This drill bit is intended for use in metalworking and maintenance applications across industrial, commercial, and trade environments. Left-hand cutting direction makes it particularly useful for extracting broken fasteners, as the bit tends to back out a seized screw or bolt while drilling. Primary workpiece materials include steel and cast iron, with material codes covering P, M, K, N, and S classifications. Typical users include machinists, maintenance technicians, pipefitters, and trade professionals working with metal substrates.

Key Features

• Left-hand cutting direction aids in broken fastener extraction
• 118-degree standard point angle with web-thinned tapered web for reduced entry thrust
• HSS construction with bright, uncoated finish suitable for steel and cast iron
• Regular spiral flute, 2-flute design with 9xD flute-to-diameter ratio
• Straight shank fits standard drill chucks without additional tooling
• ANSI-standard Series L10 jobber length for consistent dimensional accuracy

Compatibility

Designed as a general-purpose HSS jobber-length drill bit compatible with standard drill chucks and drilling equipment rated for a 31/64-inch straight shank. Suitable for drilling steel, cast iron, and other materials within the P, M, K, N, and S workpiece material classifications per ISO material group codes.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with metalworking equipment and safe drilling practices. Secure the shank fully in the chuck and verify runout before operation. Left-hand bits require a drill or driver capable of reversing rotation direction. Always wear appropriate eye protection and follow applicable shop safety standards when drilling metal.