Cleveland C15102 Cobalt Screw Machine Drill Bit Size 12

Product Description

The CLEVELAND C15102 is a screw machine length drill bit designed for high-speed, high-heat drilling applications where standard high-speed steel falls short. Built from M42 cobalt alloy, it holds a cutting edge longer than conventional HSS bits when working through tough materials. The 135-degree split point starts on contact without a center punch, reducing walking on hard surfaces. At 2.25 inches overall length, the stub body reduces deflection and runout compared to jobber-length bits. Two parabolic flutes evacuate chips efficiently, and the parallel web with web thinning lowers feed force on the cut. This bit is sold individually and is sized to wire gauge number 12, equivalent to 0.1890 inches diameter.

This bit is suited for machining, fabrication, and maintenance applications where alloy steels, aluminum, and similar materials are drilled at high spindle speeds or with automated feed. The screw machine length profile makes it a common choice for turret lathes, CNC drilling centers, screw machines, and tight-clearance hand drilling in industrial and shop environments. It is installed and used by machinists, tool-and-die technicians, and maintenance professionals who need a durable stub drill for repetitive production work.

Key Features

• M42 cobalt construction resists heat buildup during high-speed drilling in alloy steel and aluminum
• 135-degree split point reduces walking and lowers required thrust compared to conventional 118-degree points
• Parabolic flute geometry promotes fast chip evacuation and helps prevent packing in deep holes
• Web-thinned parallel web lowers feed force and extends cutting edge life
• Screw machine (stub) length at 2.25 inches OAL minimizes deflection for improved hole accuracy
• Straight-cylindrical shank diameter of 0.1890 inches fits standard drill chucks and collet holders
• Manufactured to ASME B94.11M standards with a diameter tolerance of +0.0000 to -0.0007 inches

Compatibility

Designed as an OEM-style replacement or direct substitute for screw machine length stub drills in wire size 12 (0.1890 inches), fitting any standard chuck or collet holder accepting a 0.1890-inch straight-cylindrical shank. Primary workpiece materials listed by the manufacturer are alloy steel and aluminum.

Installation Notes

Secure the shank fully in the chuck or collet before engaging the spindle, and verify runout with a dial indicator when tolerance is critical. Ensure the machine is powered off and the spindle is locked before changing bits. Apply appropriate cutting fluid or coolant to the workpiece when drilling alloy steel to manage heat, as this bit does not support through-coolant delivery. Follow shop safety procedures and applicable ANSI or ASME machining guidelines during setup and operation.