Precision Twist Drill 6000420 Cobalt Drill Bit 41/64 in

Product Description

The PRECISION TWIST DRILL 6000420 is a reduced shank cobalt drill bit designed for heavy-duty drilling in ferrous metals and a wide range of secondary materials. It features a 41/64-inch (0.6406 inch) cutting diameter with a 1/2-inch straight-cylindrical shank, allowing it to fit standard 1/2-inch chucks even when the cutting diameter exceeds that size. The 118-degree split point starts cleanly without walking and reduces the thrust needed to begin a cut. Built from cobalt steel with a bright uncoated finish, it handles elevated heat better than standard high-speed steel bits. Machinists, maintenance technicians, and industrial tradespeople rely on this bit for production and job-site drilling applications.

The 6000420 is suited for drilling ferrous metals as its primary application, and it also performs in aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials. With a 3-inch flute length and 6-inch overall length, it reaches deeper holes than jobber-length bits of similar diameter. The Series R56CO designation places it in the Precision Twist Drill cobalt reduced-shank lineup, engineered for applications where chuck capacity limits shank size but full cutting diameter is still required. Typical settings include machine shops, fabrication facilities, and maintenance environments using drill presses or milling machines.

Key Features

• 41/64-inch (0.6406 inch) cutting diameter with a reduced 1/2-inch shank for standard chuck compatibility
• Cobalt construction for improved heat resistance and extended tool life in tough ferrous metals
• 118-degree split point for fast, self-centering starts with reduced thrust
• Right-hand spiral flutes with regular helix for efficient chip evacuation
• 3-inch flute length supports drilling to a maximum depth of 3 inches
• Bright uncoated finish; ANSI standard compliant

Compatibility

Designed for use in drill presses, milling machines, and similar equipment fitted with 1/2-inch chucks. Rated for ferrous metals as the primary workpiece material, with secondary compatibility in aluminum, cermet, copper, magnesium, nickel, synthetic, and titanium materials per Series R56CO specifications.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating tool safety. Secure the 1/2-inch shank fully in the chuck and confirm runout before drilling. Power down and de-energize all equipment before changing bits. Do not exceed the recommended maximum drilling depth of 3 inches as defined by the flute length.