Cleveland C70048 Cobalt Jobber Drill Bit 8.61mm 135

Product Description

The CLEVELAND C70048 is a cobalt jobber length drill bit designed for demanding metal drilling applications in trade and industrial environments. Built from M42 cobalt high-speed steel with a gold oxide coating, this bit handles harder workpiece materials and elevated cutting temperatures better than standard HSS tooling. It features a 135-degree split point for fast engagement with reduced walking, a web-thinned and tapered web configuration for lower thrust requirements, and a two-flute regular spiral design that evacuates chips efficiently. Machinists, tool and die workers, and maintenance technicians use this bit where standard carbon steel tooling falls short.

This drill bit is suited for use in portable drill drivers, drill presses, and CNC drilling operations across light industrial, maintenance, and fabrication settings. Its straight cylindrical shank seats directly in standard chucks without adapters. The NAS 907 Type J specification makes it a recognized standard for aerospace and precision metalworking applications. Primary workpiece material is aluminum, though the M42 cobalt construction extends utility to other non-ferrous and ferrous metals in production and repair contexts.

Key Features

• M42 cobalt high-speed steel construction for extended tool life in demanding cuts
• 135-degree split point reduces drill walk and lowers required thrust at entry
• Gold oxide coating provides lubricity and heat resistance during cutting
• Web-thinned tapered web reduces cutting resistance and improves chip flow
• Straight cylindrical shank fits standard drill chucks without adapters
• Meets NAS 907 Type J specification for precision and aerospace-grade drilling

Compatibility

Designed as an OEM-style replacement and standard jobber drill for use in any drill press, hand drill, or CNC spindle accepting a straight cylindrical shank with a 0.3390 inch diameter.

Installation Notes

Installation and use of this drill bit should be performed by machinists or qualified tradespeople familiar with metalworking operations. Secure the shank fully in the chuck and verify concentricity before drilling. Always use appropriate cutting fluid or coolant for the workpiece material to extend tool life and maintain tolerance. Wear appropriate eye protection and ensure the workpiece is securely fixtured before beginning any cut.