Cleveland C70046 Jobber Drill Bit 8.2mm Cobalt 135

Product Description

The CLEVELAND C70046 is a cobalt jobber-length drill bit designed for demanding metal-drilling applications in industrial and trade environments. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention that standard HSS bits cannot match. The 135-degree split point starts on contact without a center punch, reducing walking on hard or slick surfaces. A gold oxide coating adds additional lubricity and corrosion resistance. At 4.625 inches overall length with a 3.3125-inch flute, this is a standard jobber format suitable for hand drills, drill presses, and CNC setups. Machinists, pipefitters, and sheet-metal workers are the primary installers of this type of bit.

The C70046 is rated for primary use in aluminum per the supplier specification, but the M42 cobalt construction and NAS 907 Type J compliance make it appropriate for a broad range of non-ferrous and ferrous workpiece materials where heat buildup is a concern. The straight-cylindrical shank measures 0.3230 inches in diameter, fitting standard three-jaw chucks without an adapter. The two-flute, regular-spiral design with a tapered web and web-thinned geometry clears chips efficiently in both through-hole and blind-hole applications.

Key Features

• M42 cobalt HSS construction for superior heat resistance and long cutting life
• 135-degree split point eliminates walking and reduces thrust force on entry
• Gold oxide coating improves lubricity and reduces chip adhesion
• Web-thinned, tapered web geometry for efficient chip evacuation in aluminum and other materials
• NAS 907 Type J compliant — meets aerospace and heavy-duty industrial standards
• Straight-cylindrical shank fits standard drill chucks without modification

Compatibility

Designed as a standard jobber-length drill bit for use in hand drills, drill presses, and compatible CNC drilling equipment accepting a 0.3230-inch straight-cylindrical shank. Rated for aluminum as primary workpiece material per Series 2213 specification.

Installation Notes

Drill bit installation and use should follow standard machining safety practices — secure the workpiece before drilling and confirm chuck jaws are fully tightened before starting the spindle. Apply appropriate cutting fluid for the workpiece material to extend bit life and improve hole quality. Do not exceed the recommended RPM range for the bit diameter and material combination. Inspect the cutting edges before each use; cobalt bits can chip if subjected to lateral loading or if used in an improperly aligned setup.