Cleveland C15657 Cobalt Jobber Drill Bit Letter I

Product Description

The CLEVELAND C15657 is a cobalt jobber-length drill bit designed for high-performance drilling in tough materials. Built from M42 cobalt high-speed steel and coated with TiN (titanium nitride) for extended tool life, this bit features a 135-degree split point that reduces walking and cuts through material with less thrust than a standard 118-degree geometry. The parabolic flute design improves chip evacuation, making it well-suited for deeper holes and interrupted cuts. At 4.125 inches overall length with a 2.875-inch flute, it fits standard drill chucks and CNC machining centers alike. This drill is sold as a single unit and is aimed at machinists, maintenance technicians, and metalworking tradespeople who need reliable performance in ferrous and non-ferrous stock.

The C15657 is rated for use in cast iron, non-ferrous metals, stainless steel, and steel. Its web-thinned, tapered-web construction reduces the chisel edge load at entry, which is particularly valuable when drilling stainless or hardened steel alloys where heat buildup and work hardening are concerns. The straight cylindrical shank with a diameter of 0.272 inches fits into standard collets and drill chucks without modification. This bit is a practical choice for production shops, job-site metalwork, and maintenance environments where a single versatile drill handles a range of material types.

Key Features

• M42 cobalt steel construction for elevated heat resistance and edge retention in hard materials
• TiN coating reduces friction and extends service life between resharpenings
• 135-degree split point minimizes walking and lowers thrust requirements at drill entry
• Parabolic flute geometry promotes rapid chip evacuation in deep-hole applications
• Web-thinned tapered web reduces chisel edge load for cleaner entry in tough alloys
• Conforms to ASME B94.11M and DIN 338 standards for consistent dimensional accuracy

Compatibility

Designed for use in cast iron, non-ferrous metals, stainless steel, and steel workpieces. The straight cylindrical shank is compatible with standard drill chucks and collet systems accepting a 0.272-inch shank diameter. Fits hand drills, drill presses, and CNC machining centers.

Installation Notes

This drill bit is installed and operated by machinists or qualified metalworking technicians. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits. Apply appropriate cutting fluid when drilling stainless steel or other work-hardening materials to manage heat and preserve the cutting edge. Do not exceed the recommended feed and speed parameters for the workpiece material and bit diameter.