Precision Twist Drill 5999992 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999992 is a reduced shank twist drill bit designed for general-purpose drilling in ferrous metals, aluminum, copper, and a range of other materials. It features a 39/64-inch (0.6094 inch decimal) cutting diameter paired with a 1/2-inch straight-cylindrical reduced shank, allowing it to run in standard 1/2-inch drill chucks even though the cutting diameter exceeds that size. The 118-degree standard point angle is the industry-standard geometry for most production and maintenance drilling applications. The bright, uncoated high-speed steel construction provides reliable performance across a broad range of workpiece materials without the need for specialized tooling setups.

This bit is suited for metalworking shops, maintenance and repair operations, and production environments where a versatile, general-purpose drill bit is needed. The Series R56 designation places it within a well-established line of jobber-style reduced shank bits. Typical applications include drilling through ferrous metal stock, aluminum plate, copper, magnesium, nickel alloys, synthetic materials, and titanium. The 3-inch flute length supports a maximum drilling depth of 3 inches, making it appropriate for through-hole and moderate-depth blind-hole work. The right-hand spiral flute geometry provides efficient chip evacuation during drilling.

Key Features

• 39/64-inch cutting diameter with a 1/2-inch reduced shank for use in standard 1/2-inch chucks
• 118-degree standard point angle for general-purpose drilling across a wide range of materials
• High-speed steel construction with bright, uncoated finish
• Right-hand cut with regular spiral flutes for efficient chip removal
• 6-inch overall length with a 3-inch flute length and 3-inch maximum drilling depth
• Meets ANSI standards; UNSPSC Code 23241635

Compatibility

Designed for use in drill presses, milling machines, and hand-held power drills equipped with a 1/2-inch or larger chuck. Suitable for drilling ferrous metals, aluminum, copper, magnesium, nickel alloys, titanium, cermet, and synthetic materials.

Installation Notes

This bit is typically installed and operated by machinists, tool and die technicians, or maintenance mechanics. Secure the reduced shank firmly in the chuck and confirm runout before drilling. Always wear appropriate eye protection and secure the workpiece before initiating a cut. No coolant is required for standard applications, though cutting fluid may extend tool life in harder ferrous materials.