Precision Twist Drill 6000394 3/4 Inch Cobalt Drill Bit

Product Description

The PRECISION TWIST DRILL 6000394 is a reduced shank cobalt drill bit designed for cutting ferrous metals and a broad range of secondary materials. The bit features a 3/4-inch cutting diameter paired with a 1/2-inch straight-cylindrical shank, making it compatible with standard 1/2-inch chucks without requiring a larger chuck capacity. The 118-degree split point promotes fast penetration and reduces walking on entry. Cobalt construction provides heat resistance needed when drilling harder steels and alloys. Right-hand cut geometry and a bright, uncoated finish round out the tool profile. Installed by machinists, pipefitters, electricians, and HVAC technicians in shop and field environments.

This bit is suited for drilling ferrous metals including steel and cast iron, as well as secondary materials such as aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials. The reduced shank design allows use in 1/2-inch chuck equipment when a full 3/4-inch shank drill press or magnetic drill is not available. Typical applications include structural fabrication, mechanical assembly, and trade rough-in work where large-diameter holes are required in metal stock, plate, or pipe.

Key Features

• 3/4-inch cutting diameter with 1/2-inch reduced straight-cylindrical shank for standard chuck compatibility
• 118-degree split point for fast starts and reduced thrust on entry
• Cobalt tool material for heat resistance and durability in ferrous and hard alloy materials
• 3-inch flute length and 6-inch overall length for adequate reach in most bench and field drilling setups
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Bright, uncoated finish — no coating to flake or delaminate under heavy use
• ANSI-standard geometry — Series R56CO

Compatibility

Designed for use with 1/2-inch chuck drilling equipment including corded drills, drill presses, and magnetic base drills. Rated for ferrous metals, aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials per Series R56CO specifications.

Installation Notes

Secure the reduced shank firmly in the chuck before drilling and verify runout before beginning a cut. Use appropriate cutting fluid or cutting oil when drilling harder steels to extend tool life, even though this bit is rated for dry use. Always wear eye protection and secure the workpiece to prevent rotation. Inspect the split point for chipping before each use; a damaged point will cause oversize holes and accelerated wear.