Precision Twist Drill 5995480 27/64 Inch Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5995480 is a jobber-length drill bit designed for general-purpose drilling in steel, cast iron, and similar materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it features a 118-degree standard point angle and a web-thinned, tapered-web construction that reduces entry force and improves chip clearance. The left-hand cut direction makes this bit particularly useful for removing broken fasteners and reverse-threaded applications. At 5.375 inches overall length with a 3.9375-inch flute length, it fits standard drill chucks and handles typical jobber-depth tasks in trade and industrial settings. Machinists, maintenance technicians, and tool-and-die professionals are the primary users.

This bit is suited for drilling operations in steel and cast iron workpieces, covering primary material codes P, M, K, N, and S per standard classification. The left-hand spiral makes it a go-to choice when extracting seized bolts or drilling out broken studs, since the cutting action tends to back out the damaged fastener as the bit engages. It fits into standard straight-shank drill chucks on corded drills, drill presses, and CNC machines configured for left-hand tooling. The Series L10 designation identifies it within the Precision Twist Drill jobber-length line.

Key Features

• Left-hand cut direction aids in broken fastener removal and reverse-threaded work
• 118-degree standard point angle with web-thinned, tapered-web geometry for reduced thrust
• HSS construction with bright, uncoated finish for general-purpose metal drilling
• 27/64 inch (0.4219 inch) diameter straight shank fits standard drill chucks without adapters
• 3.9375-inch maximum drilling depth supports typical jobber-length applications
• Meets ANSI standards for dimensional accuracy and performance consistency

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard straight-shank drill chucks on drill presses, hand drills, and CNC equipment configured for left-hand tooling. Primary workpiece materials include steel and cast iron.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill chucks. Secure the straight shank fully in the chuck and verify runout before drilling. Use appropriate cutting fluid or coolant when drilling steel to extend tool life, even though this bit does not support coolant-through delivery. Inspect the cutting edges for wear before each use, as a dull left-hand bit will generate excess heat and may fail to back out a seized fastener as intended.