48-89-2329 Thunderbolt Cobalt Drill Bit, 1/2 In. X 5-1/8 In.

The Milwaukee 48-89-2329 Thunderbolt Cobalt Drill Bit is engineered for drilling in hard metals, including stainless steel and other specialty materials. Cobalt drill bits maintain their hardness and cutting edge at high temperatures, outperforming standard black oxide bits by up to 10 times in hard metal applications. The Thunderbolt core resists breaking under stress, while the advanced flute design keeps the bit cooler during extended use.

This 1/2-inch diameter bit works with battery-powered drills, offering convenience on the job. The combination of cobalt construction and specialized flute geometry extends tool life and maintains cutting performance, delivering reliable results across demanding projects where standard drill bits fail quickly.

Features and Benefits

• Variable Helix Design: An aggressive 35-degree helix angle transitioning to 15 degrees provides rapid chip removal and limits heat buildup, keeping the bit sharper longer during tough applications.
• 135-Degree Split Point Tip: Delivers a precision start and prevents walking for fast, accurate holes in hard metals.
• Cooler Operation: The advanced flute geometry dissipates heat effectively, extending tool life and maintaining cutting performance.
• Battery-Drill Compatible: Works with battery-powered drills for convenience on the job.
• Long-Life Cobalt: Up to 10X longer life versus black oxide bits in hard metal drilling applications.
• Protected Packaging: Skin-carded design keeps the bit safe from contaminants and damage during storage and transport.

Specifications

• Brand: Milwaukee
• Model: 48-89-2329
• Diameter: 1/2 inch
• Overall Length: 5-1/8 inches
• Shank Diameter: 3/8 inch
• Type: Jobber bit, twist flute, 3-flute
• Tip: 135-degree split point
• Material: Cobalt

Descriptions are AI-generated. For accurate measurements, please call the store to confirm.