1/4" X 4" High Speed Steel Pilot Bit

Milwaukee 49-56-8000 Thunderbolt® 1/4" x 4" Pilot Bit – High-Speed Steel for Hole Saw Applications

The Milwaukee 49-56-8000 Thunderbolt® pilot bit is engineered for use with hole saw arbors requiring a 1/4" pilot. Constructed from high-speed steel, this bit delivers precision and durability in metal, wood, and plastic applications. Its robust Thunderbolt® web design and 135° split point provide fast, accurate starts and improved resistance to bit walking during high-speed drilling.

Key Features

• 1/4" Diameter x 4" Length: Designed to fit standard hole saw arbors and provide extended drilling reach
• 135° Split Point: Allows for fast, accurate starts with minimal bit walking
• Thunderbolt® Core: Tapered web increases strength and reduces breakage under load
• 3-Flat Shank: Prevents slippage in the arbor chuck during use
• Parabolic Flute: Improves chip removal for enhanced drilling efficiency and reduced heat buildup

Technical Specifications

• Diameter: 1/4 inch
• Overall Length: 4 inches
• Material: High-speed steel
• Point Angle: 135° split point
• Shank Type: 3-flat
• Application: Pilot bit for hole saw arbors

Application Notes

This pilot bit is intended for use in metal, wood, and plastic when paired with compatible Milwaukee hole saws and arbors. The 135° tip geometry is ideal for reducing wandering during start-up, while the reinforced web reduces deflection and breakage in tough material.

To ensure performance and tool life, always verify that the arbor is tightened properly and the pilot bit is aligned with the work surface. Replace worn pilot bits promptly to maintain accuracy and prevent damage to the arbor or saw teeth.