Precision Twist Drill 5999980 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999980 is a reduced shank drill bit designed for general-purpose drilling in metal fabrication, maintenance, and industrial applications. The bit measures 31/32 inches (0.9688 inches decimal) in cutting diameter with a 1/2-inch straight-cylindrical shank, allowing it to run in standard 1/2-inch chucks even at larger cutting diameters. Constructed from high speed steel with a bright uncoated finish, the bit features a 118-degree standard point angle and right-hand spiral flutes for consistent chip evacuation. Overall length is 6 inches with a 3-inch flute length, providing a maximum drilling depth of 3 inches.

This bit is suited for drilling ferrous metals including steel and iron, as well as secondary materials such as aluminum, copper, nickel, magnesium, titanium, and synthetic materials. It fits into standard drill press and hand drill setups where the 1/2-inch reduced shank allows use of a common chuck size without sacrificing cutting diameter. The Series R56 designation places it in a well-established general-purpose line used across machine shops, fabrication facilities, and maintenance departments.

Key Features

• 31/32-inch cutting diameter (0.9688 inches decimal) with a 1/2-inch reduced straight-cylindrical shank
• 118-degree standard point angle for general-purpose entry on ferrous and non-ferrous metals
• High speed steel construction for durability across a broad range of workpiece materials
• 3-inch flute length supports a maximum drilling depth of 3 inches
• Right-hand cut with regular spiral flutes for efficient chip removal
• Bright uncoated finish; ANSI standard compliant

Compatibility

Designed for use in any drill press, magnetic drill, or hand drill equipped with a 1/2-inch chuck. Suitable for ferrous metal, aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic workpiece materials per Series R56 application ratings.

Installation Notes

Installation is performed by machinists, maintenance technicians, or trade professionals using standard drill press or portable drill equipment. Secure the reduced shank fully in a 1/2-inch chuck and verify concentricity before use. Always power down and lock out the machine before changing bits. Use appropriate cutting fluid or coolant for the workpiece material when drilling deep holes, even though the bit is rated for dry use.