Precision Twist Drill 5999663 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999663 is a reduced shank twist drill bit engineered for general-purpose drilling in ferrous metals, aluminum, copper, nickel, titanium, and other materials. It features a 29/32-inch (0.9062-inch decimal) cutting diameter paired with a 1/2-inch Weldon shank, allowing use in standard 1/2-inch chuck machines without requiring a larger chuck capacity. The 118-degree standard point angle provides reliable starting and consistent hole geometry across a wide range of workpiece materials. This bit is part of the Series R57 line and is manufactured from high speed steel with a bright, uncoated finish. It is suited for machine shop, maintenance, and fabrication professionals who need a dependable general-purpose drill bit at a reduced shank diameter.

This drill bit is designed for use in drill presses, milling machines, and other machine tool setups where a 1/2-inch Weldon shank is the standard interface. The Weldon flat shank style provides positive drive and prevents shank slippage under load. With a 3-inch flute length and 6-inch overall length, this bit handles drilling depths up to 3 inches, making it appropriate for medium-depth through-holes and blind holes in ferrous and non-ferrous workpieces. It is commonly used in industrial maintenance, metal fabrication, and general machining applications.

Key Features

• 29/32-inch (0.9062 inch decimal) cutting diameter with a reduced 1/2-inch Weldon shank for compatibility with standard 1/2-inch tooling
• 118-degree standard point angle for general-purpose drilling across ferrous and non-ferrous materials
• High speed steel construction provides durability in a broad range of workpiece materials
• 3-flute Weldon shank design prevents rotation and slippage in the tool holder
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Bright, uncoated finish suitable for general-purpose use without coolant

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with drill presses, milling machines, and machining centers equipped with 1/2-inch Weldon-style tool holders. Suitable for drilling ferrous metals, aluminum, copper, magnesium, nickel, titanium, and synthetic materials per Series R57 specifications.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 1/2-inch Weldon-style tool holder or end mill holder; ensure the holder set screw engages the flat on the shank before applying torque. Secure the workpiece firmly before drilling to prevent movement. Verify spindle speed is appropriate for the workpiece material and bit diameter per standard machining feeds-and-speeds references. Coolant is not required but may be used to extend tool life in continuous production applications.