Precision Twist Drill 5995489 3/64 in Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5995489 is a jobber-length drill bit designed for precision drilling in metalworking and general machining applications. Ground 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 — a configuration favored for removing damaged or broken fasteners without an extractor. The straight shank measures 3/64 inches (0.0469 inches decimal) in diameter, with a flute length of 3/4 inches and an overall length of 1-3/4 inches. It belongs to the Series L10 line and conforms to ANSI standards for jobber-length tooling.

This bit is suited for drilling in steel, cast iron, and similar ferrous and non-ferrous materials under general-purpose conditions. The left-hand spiral flute is particularly useful in production and repair environments where reverse-rotation drilling is required to back out seized screws or studs. Machinists, tool-and-die workers, and maintenance technicians working on small-diameter applications will find this bit appropriate for bench drill presses, CNC machines, and hand drills where precise, small-bore entry is needed.

Key Features

• Left-hand cutting direction for reverse-rotation drilling and broken fastener removal
• 118-degree standard point angle for general-purpose entry into steel and cast iron
• HSS construction with bright, uncoated finish — suitable for dry cutting at moderate speeds
• Web-thinned, tapered web design reduces thrust and improves chip clearance
• Regular spiral flute with 2 flutes for balanced chip evacuation
• Conforms to ANSI standards — Series L10 jobber-length specification

Compatibility

Designed as an OEM-style replacement or direct-use tooling for applications requiring a 3/64-inch left-hand jobber-length drill bit. Primary workpiece materials include steel and cast iron (ISO material codes P, M, K, N, S). Straight shank fits standard 3-jaw drill chucks accepting sub-1/8-inch shanks.

Installation Notes

Installation of this bit is performed by machinists or maintenance technicians using a drill press, lathe tailstock, or hand drill with a properly sized chuck. Ensure the chuck is fully tightened and the workpiece is securely clamped before operation. At this diameter, excessive feed pressure can cause bit breakage — use light, consistent feed force and appropriate cutting speed for HSS tooling in ferrous materials. No coolant-through capability; apply cutting fluid externally if needed to extend tool life.