Precision Twist Drill 5999640 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999640 is a reduced shank twist drill bit designed for general-purpose drilling in metal and other industrial materials. The bit measures 17/32 inch (0.5312 inch) in diameter with a 1/2 inch Weldon flat shank, allowing secure seating in compatible chucks and holders. Constructed from high-speed steel with a bright, uncoated finish, this bit delivers reliable performance across a wide range of ferrous and non-ferrous applications. The 118-degree standard point angle is suited for most production and maintenance drilling tasks. Licensed trades and industrial machinists rely on this Series R57 bit for consistent, repeatable hole quality.

This drill bit is intended for use in ferrous metals, aluminum, copper, nickel, magnesium, titanium, and synthetic materials. The right-hand spiral flute design promotes efficient chip evacuation during drilling. With a 3-inch flute length and 6-inch overall length, this bit is well suited for bench drill presses, milling machine setups, and hand-held drilling operations where a reduced shank is required to fit standard 1/2 inch chucks. The Weldon flat shank prevents slippage under torque, making it appropriate for higher-feed drilling scenarios in a shop or field environment.

Key Features

• 17/32 inch cutting diameter (0.5312 inch decimal) with a reduced 1/2 inch Weldon flat shank
• 118-degree standard point angle for general-purpose entry on ferrous and non-ferrous stock
• High-speed steel construction provides durability across a broad range of workpiece materials
• Bright, uncoated finish suitable for use with or without cutting fluid
• 3-inch flute length with regular spiral for consistent chip clearance
• Right-hand cut, Series R57, meets ANSI standards

Compatibility

Designed as an OEM-style general-purpose drill bit compatible with 1/2 inch Weldon flat shank tool holders, collet chucks, and drill press spindles rated for that shank diameter. Suitable for ferrous metals, aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic workpiece materials per Series R57 specifications.

Installation Notes

Installation should be performed by a qualified machinist or trained trades professional. Secure the Weldon flat shank fully in the tool holder and tighten the set screw against the flat to prevent rotation under load. Ensure the drill press or machine spindle is powered down and locked out before changing bits. Do not exceed the maximum drilling depth of 3 inches in a single pass without retracting to clear chips.