Precision Twist Drill 5999548 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999548 is a reduced shank twist drill bit designed for drilling through ferrous metals and a range of secondary materials including aluminum, copper, nickel, and titanium. It features a 1-1/64 inch (1.0156 inch) cutting diameter paired with a 1/2 inch Weldon flat shank, allowing it to fit standard 1/2 inch chucks and mill-style holders without requiring a larger chuck capacity. The 118-degree standard point angle suits general-purpose drilling in a wide variety of shop and field applications. Constructed from high-speed steel with a bright uncoated finish, this bit is built for consistent performance in production and maintenance drilling environments. Licensed machinists, HVAC fabricators, pipefitters, and industrial maintenance technicians are the primary users.

This drill bit is suited for use in vertical mills, drill presses, and magnetic base drills where a 1/2 inch shank is the maximum capacity. The reduced shank design lets shops use a single chuck size across a range of larger-diameter bits. Primary workpiece material is ferrous metal. Secondary applications include aluminum, cermet, copper, magnesium, nickel, synthetic materials, and titanium. The Series R57 designation identifies this as part of the PRECISION TWIST DRILL general-purpose reduced shank line. It meets ANSI standards and carries a 4xD flute-length-to-diameter ratio suited for through-hole and moderate-depth drilling.

Key Features

• 1-1/64 inch (1.0156 inch) cutting diameter with a 1/2 inch reduced Weldon flat shank
• 118-degree standard point angle for general-purpose entry and centering
• High-speed steel construction for strength across ferrous and non-ferrous materials
• 3-flat Weldon shank prevents slippage in Weldon-style and set-screw holders
• 3 inch flute length and 6 inch overall length accommodate moderate drilling depth
• Bright uncoated finish — no coating buildup concerns on re-sharpening

Compatibility

Designed to seat in 1/2 inch Weldon flat shank holders and standard 1/2 inch drill chucks. Compatible with drill presses, milling machines, and magnetic base drills accepting a 1/2 inch shank. No specific machine model compatibility was stated in the product data.

Installation Notes

A licensed machinist or qualified maintenance technician should install and operate this bit. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from its holder. Seat the Weldon flat securely against the set screw to prevent pullout under load. Follow applicable ANSI B11 machine tool safety standards for drill press and milling machine operation.