Product Description
The MILWAUKEE 48-89-2313 is a 1/4-inch cobalt twist drill bit engineered for hard metal drilling and extended service life. It features a variable helix design with an aggressive 35-degree helix angle transitioning to 15 degrees, which evacuates chips efficiently and reduces heat buildup during prolonged cuts. A 135-degree split point tip starts on contact without center-punching and prevents walking on curved or hard surfaces. The 3-flat shank locks securely in chucks to prevent slipping under torque. This bit is well suited for electricians, plumbers, HVAC techs, and general trade professionals who regularly drill through steel, stainless steel, and structural metal.
The 48-89-2313 is designed for hard metal, stainless steel, mild steel, wood, PVC, and plastic applications. The enhanced tapered web strengthens the core along the full flute length, reducing breakage during aggressive feed rates. The cobalt construction resists softening under heat, making it appropriate for production drilling where bits are used continuously. It sells as a single bit and fits standard 3-jaw and quick-change chucks with 3-flat shanks. Trade installers working in mechanical rooms, electrical panels, and pipe racks will find it effective for both on-site drilling and bench work.
Key Features
- Variable helix geometry: 35-degree angle transitioning to 15 degrees for efficient chip evacuation
- 135-degree split point tip for self-starting, no-walk entry on hard surfaces
- Cobalt coating for heat resistance and extended life in hard metal applications
- Enhanced tapered web strengthens the core and increases flute durability
- 3-flat shank prevents rotation in chuck under high torque
- Compatible with wood, metal, stainless steel, PVC, and plastic
Compatibility
Designed for use in hard metal, stainless steel, mild steel, wood, PVC, and plastic. Fits standard drill chucks and 3-flat quick-change chuck systems.
Installation Notes
Install the 3-flat shank securely in a keyed or keyless drill chuck before use. Power down and disconnect tools before changing bits. Use appropriate cutting fluid when drilling stainless steel or hard alloys to extend bit life and reduce heat. Wear appropriate eye protection per OSHA general industry standards when drilling metal.
Technical Specifications
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Diameter: 1/4 inch
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Decimal Equivalent: 0.25 inches
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Overall Length: 4.09 inches
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Flute Length: 3.75 inches
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Shank Type: 3-Flat
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Coating: Cobalt
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Variable Helix: Yes
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Chip Breaker: Yes
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Pack Quantity: 1
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Application: Metal, Stainless Steel, Wood, PVC, Plastic
Standard Information
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Brand: MILWAUKEE
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Manufacturer Part Number: 48-89-2313
