Cleveland C16590 Cobalt Drill Bit 4.5 Mm 135 Degree

Product Description

The CLEVELAND C16590 is a cobalt jobber length drill bit designed for high-performance drilling in demanding materials. Built to M42 cobalt high-speed steel grade, this bit delivers the heat and wear resistance needed when cutting cast iron, stainless steel, carbon steel, and non-ferrous metals. The 135-degree split point reduces walking and lowers the thrust required to start a hole without a center punch. At 3.15 inches overall length with a 1.85-inch parabolic flute, the C16590 fits standard jobber-length applications across machine shop, maintenance, and fabrication work. The gold and oxide dual coating adds surface hardness and lubricity. Licensed tradespeople and machinists working in metal fabrication, industrial maintenance, and mechanical contracting reach for this bit when standard HSS tooling falls short.

This drill bit suits residential and commercial mechanical trades where hard or abrasive metals are encountered. Typical applications include drilling through stainless steel pipe flanges, cast iron fittings, structural steel plate, and hardened fastener stock. The straight-cylindrical shank accepts standard three-jaw drill chucks on handheld drills, drill presses, and CNC machining centers. The parabolic flute geometry evacuates chips aggressively, making it a reliable choice for deep-hole drilling passes where chip packing is a concern. HVAC, plumbing, and electrical contractors frequently use cobalt bits like the C16590 when field-drilling through structural steel or hard framing members that wear out standard bits quickly.

Key Features

• M42 cobalt high-speed steel construction for elevated heat resistance in hard-metal drilling
• 135-degree split point reduces drill walking and entry thrust on hard surfaces
• Parabolic flute profile promotes rapid chip evacuation and reduces heat buildup in the cut
• Gold and oxide dual coating improves surface lubricity and extends cutting edge life
• Web-thinned tapered web lowers cutting resistance without sacrificing bit rigidity
• Meets ASME B94.11M and DIN 338 standards for consistent dimensional accuracy

Compatibility

Designed for use in standard three-jaw chucks accepting a 0.177-inch straight-cylindrical shank. Compatible primary workpiece materials include cast iron, non-ferrous metals, stainless steel, and carbon steel. Part of the Cleveland Series 2075 heavy-duty cobalt drill bit line.

Installation Notes

Install in a drill press, handheld drill, or CNC spindle with a properly sized chuck rated for the shank diameter. Secure the workpiece firmly before drilling to prevent rotation and bit breakage. Apply appropriate cutting fluid or lubricant when drilling stainless steel or cast iron to reduce heat at the cutting edge. Inspect the cutting edges before each use and replace the bit if the point shows chipping or heat discoloration that extends into the flutes.