Irwin 5/64″ x 2″ Left-Hand Cobalt HSS Mechanics Drill Bit (30505ZR)

Description

The Irwin 5/64″ x 2″ Left-Hand Cobalt HSS Mechanics Drill Bit (30505ZR) is a precision-engineered tool designed specifically for removing broken or damaged fasteners. Unlike standard drill bits that cut in a clockwise direction, this bit features a left-hand twist that cuts in reverse (counter-clockwise). This unique design allows it to effectively drill a pilot hole into a stripped or broken bolt while its reverse action helps to grab and unscrew the fastener, often eliminating the need for a separate screw extractor. The bit is made from premium M42 cobalt high-speed steel, which contains 8% cobalt. This specialized material provides superior heat and abrasion resistance, making it ideal for use on tough materials like hardened steel, stainless steel, and other high-tensile alloys. The mechanics-length design provides added strength and rigidity, while the 135-degree split point is self-centering to prevent the bit from “walking” or wandering on the workpiece. This professional-grade tool is an essential addition to any mechanic’s or maintenance professional’s toolbox.

KEY FEATURES AND BENEFITS:

• Left-Hand Reverse Cutting Action: The unique counter-clockwise spiral is specifically engineered to drill into broken fasteners and, in many cases, will loosen and extract the item as the hole is being drilled.
• Premium M42 Cobalt Material: The 8% cobalt alloy steel construction provides excellent heat and abrasion resistance, extending the bit’s life when drilling into hard, high-tensile strength materials.
• 135-Degree Split Point: This self-centering design starts on contact without walking, allowing for precise and accurate drilling, which is critical when dealing with a broken fastener.
• Mechanics Length: The shorter overall length provides increased rigidity and reduces the likelihood of the bit snapping under torque, offering enhanced stability and control.
• Gold Oxide Finish: This surface treatment helps reduce friction and heat buildup, further prolonging the life of the bit.

SPECIFICATIONS:

• Drill Bit Type: Left-Hand Cobalt HSS Mechanics Drill Bit
• Diameter: 5/64″
• Overall Length: 2″
• Flute Length: 1″
• Shank: Straight
• Point Angle: 135 Degrees
• Point Type: Split Point
• Material: M42 High-Speed Steel with 8% Cobalt
• Hand of Cut: Left-Hand (Reverse)
• Finish: Gold Oxide

HOW TO USE:

1. Prepare the Work Area: First, ensure the broken fastener is as clean as possible. You may need to use a punch to create a small starting dimple in the center of the broken fastener.
2. Mount the Bit: Secure the Irwin 5/64″ left-hand drill bit into a drill. Make sure the drill is set to its reverse (counter-clockwise) setting. This is a critical step, as the bit will not function correctly if used in the forward direction.
3. Start Drilling: Apply slow, steady pressure and begin drilling. The left-hand rotation will cause the bit to cut into the broken fastener.
4. Extract the Fastener: As you drill, the reverse cutting action may grab the fastener and begin to unscrew it. If it does, continue drilling slowly until the fastener is completely removed.
5. Use an Extractor if Needed: If the bit creates a hole but does not extract the fastener, you can now use this pilot hole with a screw extractor. Insert the extractor into the hole and use its reverse action to remove the fastener.

BENEFITS OF USING IRWIN 5/64″ X 2″ LEFT-HAND COBALT HSS MECHANICS DRILL BIT (30505ZR):

• This specialized drill bit provides an efficient and reliable solution for a common and frustrating problem.
• By having a tool specifically designed for reverse drilling, you can often remove broken fasteners on the first try, saving significant time and effort.
• Its high-quality cobalt material ensures that it can tackle even the toughest of jobs without failing, providing consistent performance and a long tool life.
• The precise self-centering point allows for clean starts, reducing the risk of further damage to the surrounding material.

FEATURES:

• Reverse spiral design enhances fastener removal capability.
• Constructed from durable M42 cobalt steel for strength and longevity.
• Self-starting 135-degree split point prevents walking and ensures accuracy.
• Compact mechanics length provides added control and reduced breakage risk.
• Gold oxide coating minimizes friction and resists heat buildup.
• Optimized spiral flutes improve chip evacuation and cutting performance.
• Compatible with screw extractors for stubborn fasteners.
• Performs exceptionally well in high-tensile and hardened materials.