Milwaukee 48-89-2520 Cobalt Jobber Drill Bit 4.6 Inch

Product Description

The MILWAUKEE 48-89-2520 is a cobalt jobber-length drill bit engineered for hard metal applications including stainless steel, cast iron, and high-alloy materials. It features a variable helix design with an aggressive 35-degree angle that transitions to 15 degrees, promoting rapid chip evacuation and limiting heat buildup at the cutting edge. The 135-degree split point provides a precise, self-centering start that eliminates walking on hard surfaces. A built-in chip breaker further reduces friction and thermal stress during prolonged use. This bit is installed by machinists, pipefitters, ironworkers, and general tradespeople who regularly drill through tough ferrous and non-ferrous metals.

The 48-89-2520 is suited for use in residential and commercial fabrication, mechanical contracting, and maintenance applications where standard black oxide bits wear prematurely. It is sized in metric and is compatible with standard drill chucks across corded and cordless drilling platforms. The shank features a secure-grip geometry designed to prevent slipping in the chuck under high-torque conditions, which is especially relevant when drilling thick plate or structural steel.

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 eliminates walking and delivers a precise, clean start
• Cobalt construction provides up to 10 times longer life compared to standard black oxide drill bits
• Integrated chip breaker geometry decreases thermal stress during extended drilling cycles
• Secure-grip shank prevents bit from slipping in the chuck under load
• Metric sizing for use in applications requiring metric hole dimensions

Compatibility

Designed as a jobber-length cobalt drill bit for use in standard drill chucks on corded and cordless drills; suitable for drilling hard metals including stainless steel and high-alloy materials across general trade and fabrication applications.

Installation Notes

Secure the bit firmly in the drill chuck before operation and verify there is no runout before drilling into workpieces. Use appropriate cutting fluid or lubricant when drilling stainless steel or other work-hardening alloys to extend bit life and improve hole quality. Allow the bit to clear chips frequently when drilling deep holes to prevent heat buildup and bit breakage. Eye protection and appropriate PPE are required when operating rotary drilling equipment.

Technical Specifications

• Overall Length: 4.6 inches
• Package Length: 6.75 inches
• Package Width: 1.85 inches
• Package Height: 0.35 inches
• Weight: 0.1 pounds
• Point Angle: 135 degrees split point
• Helix Angle: Variable 35 degrees to 15 degrees
• Sizing System: Metric
• Unit of Measure: Each
• UPC: 045242519507

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-89-2520