Irwin 5/16" x 4-1/2" Cobalt HSS 135 Degree Drill Bit (63120)

The Irwin 5/16" x 4-1/2" Cobalt HSS 135 Degree Drill Bit (63120) is a jobber-length drill bit built for professional-grade performance in demanding applications. Constructed from a premium M35 High-Speed Steel (HSS) with 5% cobalt content, this bit is specifically designed to handle the high heat and friction generated when drilling through hard and abrasive metals. Its advanced design features a 135-degree split point that starts drilling on contact, preventing the bit from "walking" or wandering on the workpiece. This self-centering action allows for immediate penetration with less force, making your job easier and more accurate. The heavy-duty spiral flute is engineered for efficient chip ejection, which helps to reduce heat buildup and prolong the life of the bit.

KEY FEATURES AND BENEFITS:

• Superior Material Composition: The bit is made from M35 High-Speed Steel with 5% cobalt, providing excellent resistance to heat and abrasion. This allows it to maintain its sharpness and cutting performance much longer than standard HSS bits, especially when drilling into hard or abrasive metals.
• 135-Degree Split Point: The advanced point geometry enables the bit to start drilling on contact, eliminating the need for a pilot hole and preventing the bit from "walking." This feature ensures precise hole placement and reduces the amount of feed pressure required.
• Heavy-Duty Spiral Flute: The specially designed spiral flute quickly clears chips and debris from the hole as you drill. This efficient chip ejection reduces friction and heat buildup, which helps to extend the life of the bit and results in a cleaner, faster cut.
• High-Performance in Tough Metals: This drill bit is engineered to excel in materials like stainless steel, cast iron, and other hardened alloys. The cobalt content enhances the bit's durability and strength, allowing it to easily cut through materials that would quickly dull a conventional drill bit.

SPECIFICATIONS:

• Product ID: 63120
• Drill Bit Diameter: 5/16 inch (0.3125 inches)
• Overall Length: 4-1/2 inches
• Flute Length: 3-3/16 inches
• Shank Diameter: 5/16 inch
• Material: M35 High-Speed Steel (HSS) with 5% Cobalt
• Point Angle: 135 degrees
• Point Type: Split Point
• Cutting Direction: Right-Hand (Clockwise)
• Shank Type: Straight
• Finish: Gold Oxide

HOW TO USE:

1. Preparation: Before you begin, select a drill with the appropriate chuck size and a variable speed setting. Always wear personal protective equipment, including safety glasses and gloves. Secure your workpiece firmly in a vise or with clamps to prevent it from moving during drilling.
2. Installation: Insert the Irwin drill bit into the chuck of your drill, making sure the shank is fully seated. Tighten the chuck securely to prevent the bit from slipping.
3. Drilling: Start your drill at a slow speed, applying steady, firm pressure. The 135-degree split point will self-center, so you do not need to punch a starting hole. Increase the speed gradually while maintaining consistent pressure.
4. Cooling and Lubrication: For best results and to prolong the life of the drill bit, use a cutting fluid or lubricant, especially when drilling through hard metals like stainless steel. This helps to dissipate heat and prevent premature dulling of the cutting edge.
5. Finishing: Once the hole is drilled, retract the bit from the workpiece while the drill is still spinning slowly. This helps to clear any remaining chips from the hole. Turn off the drill and carefully remove the bit from the chuck.

BENEFITS OF USING IRWIN 5/16" X 4-1/2" COBALT HSS 135 DEGREE DRILL BIT (63120):

• Allows for drilling into tough, hardened, and abrasive metals that would quickly ruin a standard drill bit.
• The split point design eliminates the need for a pilot hole, saving time and reducing the number of steps required to make a hole.
• Reduces the risk of the drill bit "walking" at the start of the cut, ensuring your holes are accurately placed.
• The high-quality M35 cobalt steel construction provides superior heat resistance, which is crucial for high-friction applications.
• The efficient flute design ensures rapid removal of chips, which helps to maintain a clean cutting path and prevents the bit from overheating.

FEATURES:

• Right-Hand Cut: Drills in a clockwise rotation for standard drilling applications.
• Jobber Length: Offers a balanced length for general-purpose drilling, providing a good mix of reach and stability.
• Straight Shank: Compatible with all standard 3-jaw drill chucks on both corded and cordless drills.
• Gold Oxide Finish: A surface treatment that adds a layer of protection and can help reduce friction.
• Heavy-Duty Web: The thicker core provides additional strength and rigidity, especially important when drilling into hard materials.