Milwaukee 48-89-2516 Cobalt Jobber Drill Bit 4.3 in

Product Description

The MILWAUKEE 48-89-2516 is a cobalt jobber-length drill bit engineered for drilling hard metals including stainless steel, cast iron, and high-strength alloys. The bit features a variable helix geometry that transitions from a 35-degree angle to a 15-degree angle, promoting rapid chip evacuation and limiting heat buildup at the cutting zone. A 135-degree split point tip provides a self-centering start, eliminating the need for a center punch and preventing the bit from walking on contact. This bit is sold individually and is suited for use by machinists, ironworkers, pipefitters, and other trade professionals drilling in ferrous and non-ferrous hard metals.

The 48-89-2516 is intended for jobber-length twist drilling applications in hard metal. The cobalt construction makes it well-suited for stainless steel, hardened steel, and other materials that generate high friction and heat at the cutting edge. The variable-helix Red Helix design actively channels chips away from the cutting zone, reducing the heat that degrades cutting edges prematurely. At 4.3 inches in length, the bit fits standard drill chucks and magnetic drill setups commonly used in fabrication shops and field ironwork.

Key Features

• Cobalt construction rated for up to 10x the life of standard black oxide bits in hard metal applications
• Variable helix geometry transitions from 35 degrees to 15 degrees for rapid chip removal and reduced heat buildup
• 135-degree split point tip for self-centering start and no-walk performance
• Chip breaker geometry further reduces heat accumulation during extended drilling cycles
• Secure grip shank profile resists slipping in the chuck under high torque
• Metric sizing for use in metric-spec applications and fabrication workflows

Compatibility

Designed as a jobber-length twist drill bit compatible with standard keyed and keyless drill chucks accepting the corresponding shank diameter, suitable for use in hand drills, drill presses, and magnetic base drills.

Installation Notes

Installation and use of this drill bit should be performed by a qualified tradesperson familiar with metal drilling procedures. Secure the workpiece and confirm the chuck is tightened fully before operation to prevent bit slippage. Use appropriate cutting fluid or lubricant when drilling hard metals to extend bit life and manage heat. Always wear eye protection and follow applicable shop safety standards during drilling operations.

Technical Specifications

• Cutting Length: 4.3 inches
• Overall Package Length: 6.75 inches
• Package Width: 1.85 inches
• Package Height: 0.65 inches
• Weight: 0.07 pounds
• Point Angle: 135 degrees split point
• Helix Angle: Variable 35 degrees to 15 degrees
• Unit of Measure: Each
• UPC: 045242519460

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-89-2516