Irwin 19/64" x 3-5/8" Left-Hand Cobalt HSS Mechanics Drill Bit (30519)

The Irwin 19/64" x 3-5/8" Left-Hand Cobalt HSS Mechanics Drill Bit (30519) is a specialized tool engineered for demanding applications, particularly the removal of broken fasteners. The key benefit of its left-handed, counter-clockwise rotation is that it drills into broken screws, bolts, or studs while simultaneously helping to loosen them, often allowing for removal without a separate extractor. Constructed from premium M-42 8% cobalt high-speed steel, this bit offers superior heat and abrasion resistance, making it ideal for drilling into tough materials like stainless steel and other high-tensile-strength alloys. The 135-degree split point tip provides an advantage by preventing the bit from "walking" on the surface, ensuring a precise and accurate start with less required feed pressure. Its heavy-duty spiral flute design facilitates fast and efficient chip ejection, preventing clogging and overheating during use. This combination of features makes the drill bit a highly effective and reliable solution for challenging repair and maintenance tasks.

KEY FEATURES AND BENEFITS:

• Left-Handed Design: Ideal for removing broken screws, bolts, or studs by drilling in a counter-clockwise direction.
• Premium Cobalt Construction: Made from M-42 8% cobalt HSS for excellent heat and abrasion resistance.
• 135-Degree Split Point: Prevents walking, allowing for precision starts with minimal pressure.
• Efficient Chip Ejection: Heavy-duty spiral flutes help eject material quickly and prevent overheating.
• Optimized for Tough Materials: Performs well on stainless steel and high-tensile-strength alloys.

SPECIFICATIONS:

• Part Number: 30519
• Diameter: 19/64 inches
• Overall Length: 3-5/8 inches
• Flute Length: 2-1/16 inches
• Cutting Direction: Left-hand (counter-clockwise)
• Material: M-42 8% Cobalt High-Speed Steel (HSS)
• Point Angle: 135 degrees
• Shank Style: Straight
• Finish: Bright

HOW TO USE:

1. Select the Correct Size: Choose a left-hand drill bit with a diameter slightly smaller than the broken fastener you need to remove.
2. Secure the Workpiece: Firmly clamp the item you are working on to a stable surface to prevent movement.
3. Use a Reversible Drill: Insert the drill bit into a reversible drill or drill press and set the rotation to the reverse (counter-clockwise) setting.
4. Drill Slowly and Apply Pressure: Begin drilling slowly into the center of the broken fastener. Apply steady, moderate pressure. The left-hand rotation will help to loosen the fastener as it drills.
5. Stop if the Fastener Loosens: If the broken fastener begins to turn and back out, stop drilling and use a pair of pliers or vice grips to completely remove it.
6. Use with an Extractor (if needed): If the fastener does not turn, the hole you have drilled can now be used with a screw extractor to complete the removal process.

BENEFITS OF USING IRWIN 19/64" X 3-5/8" LEFT-HAND COBALT HSS MECHANICS DRILL BIT (30519):

• Specialized Design: Effectively removes broken fasteners without needing a separate extractor.
• Durable Composition: M-42 8% cobalt allows for drilling through the toughest materials with minimal wear.
• Enhanced Precision: The 135-degree split point helps avoid slipping and ensures accurate starts.
• Reduced Downtime: Helps complete repair tasks more efficiently by reducing complications during fastener removal.
• Professional Quality: A must-have tool in any mechanic’s or technician’s toolbox.

FEATURES:

• Reverse-Rotation Design: Drills counter-clockwise, which is ideal for loosening and extracting broken fasteners.
• Cobalt High-Speed Steel: Made from M-42 8% cobalt HSS for increased resistance to heat and abrasion.
• Heavy-Duty Flutes: Engineered to provide fast and effective chip removal, reducing heat buildup.
• Reduced Torque Design: Shortened cutting lips help prevent binding on hard materials.
• Single-Piece Construction: Machined from a single piece of steel for enhanced strength and reliability.