Irwin 7/64″ x 2-3/16″ Left Cobalt HSS Fractional Drill Bit (30507)

Description

The Irwin 7/64″ x 2-3/16″ Left Cobalt HSS Fractional Drill Bit (30507) is a specialty tool engineered for the specific and challenging task of removing broken fasteners. Unlike standard drill bits, its unique left-hand cut is designed to be used in a reverse-drilling motion. This reverse action not only creates a pilot hole but can also often catch the edges of the broken fastener, backing it out without the need for a separate screw extractor. The bit is made from premium M-42 High-Speed Steel with 8% cobalt, a material composition that provides exceptional heat resistance and durability when drilling into difficult materials like high-tensile steel, stainless steel, and other hardened alloys. Its shorter screw machine length provides increased rigidity, reducing the risk of snapping under pressure. This tool is an essential addition for professionals who frequently encounter broken studs, bolts, or screws and need a reliable solution for removal.

KEY FEATURES AND BENEFITS:

• Left-Hand Cut: This key feature allows the drill bit to be used in reverse, which is the primary method for drilling into broken fasteners. The reverse cutting action can effectively grip the broken stud or bolt, loosening and extracting it from the material as you drill.
• M-42 Cobalt HSS Material: Constructed with 8% cobalt content, this bit is far more heat and abrasion-resistant than standard HSS bits. This enables it to maintain its cutting edge longer when drilling into tough, high-alloy steels and other hardened metals.
• 135° Split Point: The self-centering split point design prevents the bit from “walking” on the workpiece, ensuring a clean and accurate start with less feed pressure. This is particularly important when drilling into small or uneven surfaces, such as the face of a broken bolt.
• Screw Machine Length: The shorter overall length of this drill bit increases its rigidity and reduces the chance of deflection or breakage. This is ideal for precision drilling in applications where a standard-length bit would be too flexible.
• Gold Oxide Finish: This finish provides a layer of lubrication and some protection against corrosion, further extending the tool’s lifespan and maintaining its cutting performance.

SPECIFICATIONS:

• Drill Diameter: 7/64″
• Overall Length: 2-3/16″
• Flute Length: 1″
• Shank Diameter: 7/64″
• Material: M-42 High-Speed Steel with 8% Cobalt
• Point Angle: 135°
• Point Type: Split Point
• Hand of Cut: Left-Hand
• Finish: Gold Oxide

HOW TO USE:

1. Preparation: Ensure the drill bit is securely fastened in a drill with a reverse function. Always wear appropriate personal protective equipment, including safety glasses. Center punch the broken fastener to create a precise starting point for the drill bit.
2. Reverse Drilling: Set your drill to its reverse setting. Begin drilling slowly with light pressure on the broken fastener. The left-hand cutting action will engage the material in reverse.
3. Extraction: As the drill bit cuts into the broken fastener, the reverse motion may cause the fastener to loosen and begin to turn out. Continue drilling steadily, and if the fastener starts to back out, you can often remove it completely with the drill bit itself.
4. Using an Extractor (If Needed): If the fastener does not extract on its own, continue drilling the pilot hole to the appropriate depth. Once the hole is drilled, you can then use a traditional screw extractor in the pilot hole to remove the broken fastener.

BENEFITS OF USING IRWIN 7/64″ X 2-3/16″ LEFT COBALT HSS FRACTIONAL DRILL BIT (30507):

• This specialized drill bit provides a highly efficient solution for a common and difficult problem.
• Its ability to drill and extract broken fasteners simultaneously can significantly reduce job time and effort.
• The M-42 cobalt material and robust design mean it can handle high-stress applications in a variety of materials without premature wear or failure.
• By eliminating the need for a separate extractor tool in many cases, it simplifies the removal process.
• The split point design ensures accurate hole placement, minimizing damage to the surrounding material and leading to a cleaner and more professional result.

FEATURES:

• High-speed steel construction with an 8% cobalt alloy for enhanced heat and abrasion resistance.
• Shorter screw machine length provides exceptional rigidity for precise and controlled drilling.
• Left-hand cut specifically designed for drilling into and removing broken fasteners.
• 135° split point tip eliminates the need for a center punch and prevents bit walking.
• Heavy-duty spiral flute design for faster chip ejection and smooth operation.
• Gold oxide surface treatment for improved lubricity and corrosion protection.
• Engineered to drill into high-tensile strength metals and hardened alloys.