Milwaukee 48-89-2503 Cobalt Red Helix Jobber Drill Bit

Product Description

The MILWAUKEE 48-89-2503 is a cobalt jobber-length drill bit built for hard metal drilling applications where standard high-speed steel bits wear out quickly. It features a variable helix design that starts at a 35-degree angle and transitions to 15 degrees, promoting rapid chip evacuation and limiting heat buildup at the cutting edge. The 135-degree split point tip starts on contact without walking, producing accurate holes without a center punch. A chip breaker geometry further reduces heat accumulation during extended cuts. This bit is sold individually and is sized at 1.9 inches in length, suited for electricians, plumbers, pipefitters, and general trade professionals drilling through stainless, hardened steel, and other tough alloys.

This drill bit is designed for use in hard metal applications including stainless steel, high-alloy steels, and other tough materials that exceed the capacity of standard black oxide bits. The jobber-length profile fits standard drill chucks and is appropriate for both handheld drills and drill press work. A knurled shank provides a secure grip in the chuck, reducing slippage under load. The metric sizing makes this bit a practical choice for tradespeople working with metric fasteners or metric-specified hole tolerances on commercial and industrial jobsites.

Key Features

• Variable helix design: 35-degree angle transitioning to 15 degrees for rapid chip removal
• 135-degree split point tip for precision starts without walking
• Chip breaker geometry reduces heat buildup during prolonged drilling
• Cobalt construction rated for up to 10 times the service life compared to black oxide bits
• Knurled shank for secure chuck grip and reduced slippage
• Metric sizing for compatibility with metric-spec applications

Compatibility

Designed as an OEM-style jobber drill bit compatible with standard three-jaw drill chucks used in handheld drills and bench drill presses across hard metal twist drilling applications.

Installation Notes

Installation of this drill bit is performed by licensed electricians, plumbers, pipefitters, and other trade professionals using standard drill chucks. Ensure the chuck is fully tightened and the bit is seated squarely before operation. Use appropriate cutting fluid or lubricant when drilling hard alloys to extend bit life and manage heat. Inspect the cutting edge before each use and replace the bit if the tip shows signs of chipping or dulling.

Technical Specifications

• Length: 1.9 inches
• Overall Length: 5.7 inches
• Weight: 0.02 pounds
• Point Angle: 135 degrees split point
• Helix Angle: 35 degrees transitioning to 15 degrees
• Sold As: Each
• UPC: 045242519330

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 48-89-2503