Cleveland C15928 Jobber Drill Bit 20 Cobalt 135 Degree

Product Description

The CLEVELAND C15928 is a jobber-length twist drill bit engineered for heavy-duty drilling in superalloys and other difficult-to-machine materials. Built from M42 cobalt high-speed steel with an oxide coating, it delivers heat and wear resistance required when cutting stainless, nickel-based alloys, and titanium. The bit measures 0.1610 inches in diameter (wire size 20) with a 3.25-inch overall length. A 135-degree split point reduces walking and lowers thrust on entry, making it a reliable choice for production shops, aerospace contractors, and tool rooms that need consistent hole quality in challenging stock.

This bit is suited for use in drill presses, CNC machining centers, and hand-held power drills where controlled feed rates can be maintained. Its fast spiral flute geometry promotes efficient chip evacuation, which is especially important when drilling deep holes in gummy or work-hardening materials. The straight-cylindrical shank seats securely in standard 3-jaw chucks and collet holders. Licensed metalworking shops, tool-and-die facilities, and MRO operations working with superalloy components are the primary users of this series.

Key Features

• M42 cobalt steel construction provides superior hot hardness compared to standard M2 or M7 HSS bits
• 135-degree split point reduces thrust and prevents bit walk on entry without a center punch
• Oxide coating improves lubricity and surface hardness for extended tool life
• Fast spiral flute with web-thinned, tapered web promotes aggressive chip evacuation
• Right-hand cut with 2-flute spiral geometry suits a wide range of drilling equipment
• Manufactured to ASME B94.11M and NAS specification standards

Compatibility

Designed as an OEM-style jobber drill bit replacement for metalworking applications requiring wire size 20 (0.1610 inch diameter) bits; fits any standard chuck or collet accepting a 0.1610-inch straight-cylindrical shank.

Installation Notes

Installation and use should be performed by a qualified machinist or metalworking professional familiar with feeds, speeds, and cutting fluid requirements for cobalt tooling. Secure the shank fully in the chuck before operation and verify runout before beginning a cut. Apply an appropriate cutting fluid or oil when drilling superalloys to manage heat buildup and extend tool life. Do not exceed the recommended feed rate for the workpiece material, as cobalt bits are hard but brittle under shock loading.