Irwin 26135434 Cobalt Alloy Drill Bit 3/8 X 5 Inch

Product Description

The IRWIN 26135434 is a cobalt jobber-length drill bit designed for cutting through hardened steel, stainless steel, high-strength alloys, and other tough metals that standard high-speed steel bits struggle to handle. The bit measures 3/8 inch in diameter and 5 inches in overall length, with a 135-degree split-point tip that reduces walking on contact and starts cutting immediately without a center punch on most surfaces. Construction uses cobalt alloy steel throughout the body, providing heat resistance during high-friction drilling operations. The web is built thick for rigidity, reducing flex and breakage risk under load. This bit is sized for jobber-length applications and fits standard 3/8-inch or larger drill chucks. Electricians, pipefitters, HVAC techs, and general tradespeople reach for cobalt bits when working with conduit bodies, structural steel, and equipment enclosures.

This drill bit is suited for drilling into ferrous and non-ferrous metals in both residential and commercial trade applications. Typical use cases include drilling through steel junction boxes, HVAC equipment panels, stainless fastener clearance holes, structural steel members, and metal framing. The 3/8-inch diameter is a common size for conduit knockouts, lag bolt clearance, and anchor bolt pass-throughs. The cobalt alloy composition makes it a practical choice wherever heat buildup from friction would degrade a standard twist bit prematurely.

Key Features

• Cobalt alloy steel construction for high heat resistance during metal drilling
• 135-degree split-point tip reduces bit walking and improves bite on hard surfaces
• Thick web design increases rigidity and resists breakage under lateral load
• 3/8 inch diameter x 5 inch length suits jobber-length drilling tasks
• Compatible with standard 3/8-inch and larger keyed or keyless drill chucks

Compatibility

Designed as a jobber-length cobalt drill bit for use in any standard drill or drill press accepting a 3/8-inch shank. Suitable for drilling hardened steel, stainless steel, and high-strength alloys.

Installation Notes

Use cutting oil or a water-soluble coolant when drilling hardened or stainless steel to extend bit life and reduce heat buildup. Secure the workpiece firmly before drilling to prevent rotation and bit damage. Start at a lower RPM for larger diameter bits in hard materials, increasing feed pressure gradually. Always wear appropriate eye protection when operating drill bits on metal.

Technical Specifications

• Bit Type: Cobalt Jobber
• Primary Material: Cobalt Alloy Steel
• Diameter: 3/8 inch
• Overall Length: 5 inches
• Package Height: 8.5 inches
• Package Width: 1.875 inches
• Package Length: 0.375 inches
• Weight: 0.12 pounds
• Point Angle: 135 degrees
• Country of Origin: China

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: 26135434