Precision Twist Drill 5999610 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999610 is a reduced shank twist drill bit built for general-purpose metal drilling in professional trade and industrial settings. It features a 1-7/64 inch (1.1094 inch) cutting diameter with a 1/2 inch Weldon flat shank, allowing secure tool engagement in compatible chucks and holders. The 118-degree standard point angle suits a wide range of ferrous and non-ferrous materials. Constructed from high-speed steel with a bright uncoated finish, this bit delivers reliable performance on drilling operations where coatings are not required. Licensed machinists, maintenance techs, and fabrication professionals are the primary installers.

This bit is rated for general-purpose drilling into ferrous metals as a primary workpiece material, with secondary suitability for aluminum, copper, magnesium, nickel, titanium, synthetic materials, and cermet. It fits applications where a reduced shank is needed to use a larger-diameter bit in a standard 1/2 inch chuck. The 3-inch flute length and 6-inch overall length provide sufficient reach for most bench drilling, drill press, and milling machine setups. The Series R57 designation places it within PRECISION TWIST DRILL's standard reduced shank line.

Key Features

• 1-7/64 inch cutting diameter with 1/2 inch reduced Weldon flat shank for use in standard 1/2 inch chucks
• 118-degree standard point angle for general-purpose entry into ferrous and non-ferrous materials
• High-speed steel construction with bright uncoated finish
• 3-inch flute length with regular spiral flute type for efficient chip evacuation
• 6-inch overall length with a maximum drilling depth of 3 inches
• Three flats on Weldon shank prevent bit slippage under load
• Right-hand cut; meets ANSI standards

Compatibility

Designed as a general-purpose reduced shank drill bit for use in drill presses, milling machines, and power drills equipped with a 1/2 inch chuck or Weldon-style tool holder. Suitable for ferrous metals, aluminum, copper, magnesium, nickel, titanium, synthetic materials, and cermet workpieces.

Installation Notes

This bit is installed by machinists or maintenance professionals in a drill press, milling machine, or hand-held power drill with a compatible 1/2 inch Weldon-style holder. Secure the Weldon flat shank fully in the holder and tighten set screws against the flats before operation to prevent slippage. Power down and de-energize all equipment before changing bits. Always wear appropriate eye and face protection when drilling metal.