Precision Twist Drill 5995463 1/4 in Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5995463 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, it features a 118-degree standard point angle and a left-hand cutting direction. The straight shank measures 1/4 inch in diameter, and the overall length is 4 inches with a flute length of 2.75 inches. The web-thinned, tapered web construction reduces thrust requirements at entry. This bit is suitable for use by machinists, pipefitters, electricians, and general trade professionals working with metal substrates.

This Series L10 jobber-length bit is sized at 1/4 inch (0.2500 inch decimal, Letter E equivalent) and is intended for drilling operations in residential and commercial trade applications. The left-hand cutting direction makes it particularly useful for removing broken fasteners or for use with left-hand-threaded components. It is rated for drilling in steel and cast iron workpieces and carries an ANSI specification designation. Maximum drilling depth matches the flute length at 2.75 inches.

Key Features

• Left-hand cutting direction — effective for broken bolt extraction and reverse-threaded applications
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• HSS construction with bright, uncoated finish for general-purpose metal drilling
• Regular spiral flute, 2-flute configuration with an 11xD flute-to-diameter ratio
• Straight shank at 0.2500 inch diameter for use in standard drill chucks
• ANSI-compliant Series L10 jobber-length geometry

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard drill chucks accepting a 1/4-inch straight shank. Primary workpiece materials include steel and cast iron. Material category codes P, M, K, N, and S are supported per manufacturer specification.

Installation Notes

Secure the straight shank firmly in a drill chuck before operation and verify chuck key removal prior to powering the tool. Left-hand bits require a reversible drill set to left-hand (counterclockwise) rotation. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and reduce heat buildup. Always wear appropriate eye protection and secure the workpiece to prevent movement during drilling.