Cleveland C15266 5/16 in Cobalt Screw Machine Drill Bit

Product Description

The CLEVELAND C15266 is a screw machine length drill bit designed for high-performance drilling in demanding production and maintenance environments. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance that standard HSS bits cannot match. The 5/16-inch (0.3125-inch) diameter bit features a 135-degree split point for fast penetration and reduced walking on contact, and a parabolic flute geometry that efficiently evacuates chips during deep-hole drilling. A straight-cylindrical shank ensures secure, concentric seating in standard drill chucks and machine spindles. This bit is suited for machinists, maintenance technicians, and fabricators working with hard or abrasive materials.

The C15266 is designed for drilling alloy steels and aluminum in screw machine operations, CNC drilling setups, drill press applications, and general production environments where tool life and accuracy matter. Its shorter screw machine length body provides added rigidity compared to jobber-length bits, reducing deflection on through-holes and blind holes in metalworking applications. Web-thinned geometry at the tip lowers thrust requirements, making it practical for both manual and machine-fed operations.

Key Features

• M42 cobalt construction for superior heat resistance when drilling alloy steel and aluminum
• 135-degree split point reduces walking and lowers entry thrust
• Parabolic flute design promotes fast, efficient chip evacuation
• Web-thinned, parallel-web configuration reduces cutting resistance
• Straight-cylindrical shank fits standard chucks without modification
• Meets ASME B94.11M dimensional standards

Compatibility

Designed as a screw machine length replacement drill bit for metalworking applications involving alloy steel and aluminum workpieces, compatible with any drill press, CNC machine, or hand drill equipped with a standard chuck accepting a straight-cylindrical shank.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician. Ensure the machine spindle is fully powered down and at rest before inserting or removing the bit from the chuck. Secure the shank firmly to the full depth of the chuck jaws to minimize runout. Follow applicable shop safety standards and manufacturer feed-and-speed recommendations for cobalt tooling when setting up the drilling operation.