Milwaukee 48-89-2507 Cobalt Jobber Drill Bit 2.8 Inch

Product Description

The MILWAUKEE 48-89-2507 is a cobalt jobber-length drill bit engineered for hard metal applications where standard high-speed steel bits fail prematurely. Built with a variable helix geometry that transitions from a 35-degree angle down to 15 degrees, the bit promotes rapid chip evacuation and limits heat buildup at the cutting zone. The 135-degree split point tip starts on contact without walking, reducing layout time and improving hole accuracy. This bit is sold individually and is sized to metric dimensions, making it a direct fit for metric-specification work. Installers and machinists working in stainless steel, hardened steel, cast iron, and similar hard materials will find this bit suited for production or field use.

The 48-89-2507 is intended for jobber-length twist drilling in ferrous metals, structural steel, and other hard materials encountered in mechanical, fabrication, HVAC, and industrial service environments. The metric sizing makes it a practical choice when working to metric-specification tolerances. A chip breaker geometry reduces friction heat, extending usable bit life compared to standard black oxide twist bits. The shank includes a secure grip feature designed to resist slipping in standard drill chucks during high-torque applications.

Key Features

• Variable helix design: 35-degree angle transitions to 15 degrees for rapid chip removal and reduced heat
• 135-degree split point tip starts on contact and prevents walking
• Cobalt construction provides extended life in hard metal and ferrous applications
• Chip breaker geometry limits heat buildup to maintain edge sharpness over longer service life
• Secure grip shank resists slipping in standard drill chucks under high-torque conditions
• Metric sizing for metric-specification drilling applications

Compatibility

Designed for use in standard keyed and keyless drill chucks in corded or cordless drill drivers and drill presses for jobber-length twist drilling in hard metals and ferrous materials.

Installation Notes

This bit is installed and used by mechanical trades, fabricators, and HVAC technicians working in hard metal substrates. Secure the bit fully in the chuck before operation and confirm chuck tightness to prevent slippage under load. Use cutting fluid or a suitable lubricant when drilling stainless steel or hardened steel to further reduce heat and extend bit life. Ensure the workpiece is clamped securely before drilling to prevent movement.

Technical Specifications

• Bit Length: 2.8 inches
• Helix Angle (Start): 35 degrees transitioning to 15 degrees
• Split Point Angle: 135 degrees
• Sizing Standard: Metric
• Package Dimensions: 5.7 inches x 1.9 inches x 0.1 inches
• Weight: 0.03 pounds
• Sold As: Each
• UPC: 045242519378

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-89-2507