Milwaukee 48-89-2519 Cobalt Jobber Drill Bit 4.6 in Metric

Product Description

The MILWAUKEE 48-89-2519 is a cobalt jobber-length twist drill bit engineered for hard metal drilling applications. It features a variable helix geometry with an aggressive 35-degree helix angle transitioning to 15 degrees at the shank, which promotes rapid chip evacuation and limits heat buildup during extended drilling cycles. The 135-degree split point tip provides a self-centering start and eliminates walking on hard surfaces. This bit ships as a single unit and is sized to metric specifications, making it suitable for fabricators, maintenance mechanics, pipefitters, and ironworkers who regularly drill through stainless steel, hardened alloys, and other ferrous metals.

This drill bit is built for tough drilling tasks in both shop and field environments. The cobalt construction allows it to maintain cutting edge integrity under the high heat generated by hard metals, including stainless steel, cast iron, and high-strength alloys. A chip breaker geometry further reduces heat concentration at the cutting edge, extending service intervals between sharpenings. The bit is compatible with standard three-jaw keyless and keyed chucks found on corded drills, drill presses, and magnetic base drills. Its jobber length makes it appropriate for general-purpose through-hole work across a wide range of material thicknesses.

Key Features

• Variable helix design transitions from 35 degrees to 15 degrees for rapid chip removal and reduced heat buildup
• 135-degree split point tip self-centers and prevents walking on hard surfaces
• Cobalt steel construction maintains cutting edge hardness in high-heat drilling conditions
• Chip breaker geometry decreases heat concentration and extends bit life
• Secure grip shank reduces slippage in chuck during high-torque drilling
• Metric sizing for dimensional accuracy in metric-spec applications

Compatibility

Designed for use in standard three-jaw keyed and keyless drill chucks; suitable for corded drill motors, drill presses, and magnetic base drills used in hard metal twist drilling applications.

Installation Notes

Installation and use of this drill bit should be performed by qualified tradespeople familiar with metalworking drill operations. Secure the workpiece firmly before drilling and verify the chuck is fully tightened before applying power. Use appropriate cutting fluid on hard metals to further reduce heat and extend bit life. Inspect the cutting edge for wear before each use and replace the bit if the tip shows signs of chipping or deformation.