Precision Twist Drill 5999651 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999651 is a reduced shank twist drill bit designed for general-purpose drilling in ferrous metals, aluminum, copper, titanium, and a range of other materials. It is manufactured from high-speed steel with a bright, uncoated finish and features a 118-degree standard point angle. The drill diameter is 23/32 inches (0.7188 inches decimal) with a 1/2-inch Weldon flat shank, allowing secure chuck engagement and preventing bit rotation under load. Overall length is 6 inches with a 3-inch flute length, placing this in a standard jobber-style envelope suited for bench drill presses, floor-standing drill presses, and milling machine setups.

This bit is part of the Series R57 line and is built for right-hand cutting in general-purpose metalworking environments. The reduced shank design allows the larger 23/32-inch diameter bit to be held in a standard 1/2-inch capacity chuck, making it practical for shops and field techs who need oversized hole capacity without dedicated large-bore equipment. Typical applications include structural metalwork, HVAC equipment fabrication, electrical enclosure knockout drilling, plumbing rough-in through metal framing, and maintenance repair operations across commercial and industrial settings.

Key Features

• 23/32 inch (0.7188 inches) drill diameter with 1/2-inch reduced Weldon flat shank for standard chuck compatibility
• 118-degree standard point angle for general-purpose entry into ferrous and non-ferrous metals
• High-speed steel construction provides durability across a broad range of workpiece materials
• 3-inch flute length supports maximum drilling depth of 3 inches in a single pass
• Three-flat Weldon shank design resists torque-induced slipping in the chuck
• Right-hand spiral flutes with regular helix for efficient chip evacuation
• Bright, uncoated finish suitable for use with or without cutting fluid on compatible materials

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with any 1/2-inch capacity drill chuck or Weldon-style tool holder. Rated for ferrous metals as the primary workpiece material, with secondary compatibility for aluminum, cermet, copper, magnesium, nickel, synthetic materials, and titanium per ANSI standards.

Installation Notes

Installation and use should be performed by a qualified machinist, metalworker, or trade professional familiar with rotating cutting tools. Secure the Weldon flat shank firmly in the chuck or tool holder before operation, and verify that all set screws are tightened against the flats to prevent slipping under load. Power down and de-energize all equipment before changing bits. Eye protection and appropriate PPE are required when operating drill presses or milling equipment with high-speed steel tooling.