Value Collection 1060578 Cobalt Jobber Drill Bit No. 4

Product Description

The VALUE COLLECTION 1060578 is a cobalt jobber-length drill bit in No. 4 wire size (0.2090 inches), designed for general-purpose drilling in ferrous metals and other hard materials. Built to NAS 907-J specification, it features a 135-degree split point that reduces walking on contact and a black oxide coating that provides light corrosion resistance and reduced friction during cutting. The parabolic flute geometry promotes efficient chip evacuation, which matters in deeper holes. This bit is suited for use by machinists, maintenance technicians, and fabricators working with steel and cast iron in production or field environments.

This drill bit is appropriate for drilling steel, cast iron, and similar ferrous workpiece materials in general-purpose applications. The straight cylindrical shank fits standard keyless and keyed drill chucks without modification. At 3.75 inches overall length with a 2.5-inch flute and a maximum drilling depth of 2.5 inches, it fits typical benchtop drill presses, magnetic drills, and hand drills. The Series L6501 designation identifies it within a standardized cobalt jobber line.

Key Features

• Cobalt construction for improved heat resistance in hard-metal drilling compared to standard HSS
• 135-degree split point reduces thrust and minimizes bit walking on hard surfaces
• Parabolic flute design accelerates chip evacuation in deeper cuts
• Black oxide proprietary coating reduces friction and provides light rust protection
• X-thinned web reduces cutting resistance and improves penetration
• Meets NAS 907-J specification for dimensional and performance consistency

Compatibility

Designed as a general-purpose OEM-style cobalt jobber drill bit compatible with any standard drill chuck accepting a 0.2090-inch straight cylindrical shank.

Installation Notes

Installation is performed by machinists and maintenance technicians using standard drill chucks or collet systems. Ensure the workpiece is securely clamped before drilling and that cutting speed is appropriate for the workpiece material and bit diameter. Use cutting fluid when drilling steel or cast iron to extend bit life and improve hole quality. Inspect the point for wear before each use, as a degraded split point increases thrust and reduces hole accuracy.