Precision Twist Drill 5999538 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999538 is a reduced shank drill bit designed for general-purpose drilling in metal fabrication, maintenance, and mechanical trade work. The cutting diameter measures 1 inch while the shank diameter is reduced to 1/2 inch, allowing use in standard 1/2-inch chuck equipment without requiring a larger capacity machine. Built from high-speed steel with a bright uncoated finish, it delivers reliable performance across ferrous metals and a range of secondary materials. The 118-degree standard point angle provides a balanced entry geometry suited to most common drilling applications. Overall length is 6 inches with a 3-inch flute length.

This bit fits applications where a full 1-inch shank setup is unavailable or impractical. The Weldon flat shank with three flats resists rotation in end mill holders and Weldon-style chucks, making it a practical choice for drill press, CNC, and manual milling setups. Suitable for right-hand cutting in ferrous metal as the primary workpiece material, with secondary compatibility including aluminum, copper, nickel, titanium, magnesium, and synthetic materials. Series R57 designates this as part of PRECISION TWIST DRILL's standard reduced shank line built to ANSI standards.

Key Features

• 1-inch cutting diameter with 1/2-inch reduced shank for use in standard chuck equipment
• High-speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle for general-purpose entry geometry
• Weldon flat shank with three flats prevents rotation in Weldon-style holders
• 6-inch overall length with 3-inch flute length and 3-inch maximum drilling depth
• Bright uncoated finish; right-hand spiral flute; regular spiral type

Compatibility

Designed for use in 1/2-inch capacity drill chucks, Weldon-style holders, and drill press setups requiring a reduced shank configuration for 1-inch diameter drilling. Compatible with ferrous metal, aluminum, copper, nickel, titanium, magnesium, cermet, and synthetic workpiece materials per Series R57 specifications.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Secure the Weldon flat shank fully into the holder before operation and verify that set screws engage the flats to prevent slippage under load. Always power down the machine and confirm it has come to a complete stop before changing tooling. Follow applicable shop safety standards and machine manufacturer guidelines for speed and feed rates based on workpiece material.