Precision Twist Drill 5999935 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999935 is a reduced shank twist drill bit designed for boring holes in ferrous metals and a range of secondary materials. It measures 1-7/64 inches (1.1094 inches decimal) in cutting diameter with a 1/2-inch straight-cylindrical shank, allowing it to fit standard 1/2-inch chucks even at this larger diameter. The bit is manufactured from high speed steel with a bright, uncoated finish and features a 118-degree standard point angle suited for general-purpose drilling. It belongs to the Series R56 line and is intended for use by machinists, maintenance technicians, and trade professionals requiring reliable, repeatable hole quality.

This drill bit is suited for general-purpose drilling in ferrous metals as its primary workpiece material. Secondary compatible materials include aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials. The reduced shank design makes this large-diameter bit accessible on machines equipped with standard 1/2-inch chuck capacity, expanding its utility in shop, field, and maintenance environments where a full-shank arbor setup is not available. It is a right-hand cut bit with a regular spiral flute profile.

Key Features

• Reduced shank design: 1-7/64-inch cutting diameter fits standard 1/2-inch chucks
• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle for general-purpose drilling applications
• Bright/uncoated finish — no added coating to reduce heat dissipation concerns in light-duty use
• 3-inch flute length supports drilling depths up to 3 inches
• Right-hand cut with regular spiral flutes for consistent chip evacuation

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with 1/2-inch chuck drilling equipment. Suitable for drill presses, milling machines, and hand drills with 1/2-inch capacity chucks.

Installation Notes

This bit should be installed in a properly secured 1/2-inch chuck before powering the drilling machine. Always ensure the workpiece is clamped securely before drilling to prevent movement. Use appropriate cutting fluid or coolant based on the workpiece material and machine specifications, noting the bit itself does not have a built-in coolant channel. Follow applicable shop safety standards and machine manufacturer guidelines when selecting feed rate and spindle speed for the target material.