Eagle Cutting Tool S300-028-I Cobalt Jobber Drill 7/16

Product Description

The EAGLE CUTTING TOOL S300-028-I is a 7/16-inch cobalt jobber-length drill bit designed for demanding drilling applications in metal, stainless steel, cast iron, and other hard materials. Cobalt construction provides superior heat resistance compared to standard high-speed steel, making it well-suited for production drilling where bit temperatures run high. The jobber-length flute geometry balances reach and rigidity for general-purpose through-hole drilling. Machinists, maintenance mechanics, and trade professionals who work with ferrous metals rely on this drill size for tasks ranging from clearance holes to pilot holes in structural work.

This 7/16-inch cobalt jobber drill is appropriate for use in drill presses, hand drills, and CNC setups wherever a standard jobber-length bit is specified. It fits common 1/2-inch and larger keyed or keyless chucks. Typical applications include fabrication shops, mechanical contractors, and industrial maintenance settings where stainless, alloy steel, or work-hardened materials are regularly drilled. The cobalt alloy composition helps maintain cutting edge integrity during extended run cycles that would degrade standard HSS bits.

Key Features

• 7/16-inch cutting diameter in cobalt alloy construction for hard-material drilling
• Jobber-length flute provides a balance of reach and bit stiffness
• Cobalt composition resists heat buildup during high-feed or production drilling
• Compatible with standard 1/2-inch and larger drill chucks
• Minimum order quantity of 1, suitable for single-piece procurement

Compatibility

Designed as a standard jobber-length replacement drill bit for use in any drill press, hand drill, or CNC spindle accepting a 7/16-inch shank bit with a 1/2-inch or larger chuck capacity.

Installation Notes

Secure the bit firmly in the chuck before operation and verify the chuck key is removed prior to starting any drill. Use appropriate cutting fluid or coolant when drilling hard or stainless steel to extend bit life and maintain cutting edge geometry. Always wear appropriate eye protection and secure the workpiece before drilling. Bit sharpening or replacement should be performed when the cutting edge shows visible wear or when thrust pressure increases noticeably during use.

Technical Specifications

• Cutting Diameter: 7/16 inches
• Drill Type: Jobber Length
• Material: Cobalt
• Weight: 1.2 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: S300-028-I