Cleveland C15063 Screw Machine Drill Bit 17/64 Cobalt

Product Description

The CLEVELAND C15063 is a screw machine length cobalt drill bit designed for high-speed, high-heat drilling applications in metal fabrication, machining, and maintenance trades. Built from M42 cobalt high-speed steel, this bit maintains hardness and cutting edge integrity at elevated temperatures that would degrade standard HSS tooling. It features a 135-degree split point for fast penetration with minimal walking on entry, and a parabolic flute geometry engineered to clear chips efficiently. The 17/64 inch diameter (0.2656 inch decimal) and 2-5/8 inch overall length make it well suited for close-quarter drilling where stub-length clearance is needed.

This bit is intended for use in production and job-shop environments where alloy steel, aluminum, and other demanding workpiece materials are drilled at high cycle rates. The screw machine length format reduces deflection and improves rigidity compared to jobber-length bits, making it a practical choice for drill press work, CNC turret operations, and handheld drilling in tight spaces. The straight-cylindrical shank fits standard drill chucks without modification. It conforms to ASME B94.11M standards and carries an ANSI specification designation.

Key Features

• M42 cobalt HSS construction resists heat buildup during continuous metal drilling
• 135-degree split point reduces thrust force and eliminates center-punch marking on most metals
• Parabolic flute profile promotes rapid chip evacuation and reduces clogging
• Web-thinned, parallel-web design lowers cutting resistance and extends tool life
• Screw machine (stub) length improves rigidity and reduces deflection in short-reach applications
• Diameter tolerance held to +0.0000 to -0.0010 inch per ASME B94.11M

Compatibility

Designed for drilling alloy steel and aluminum workpieces; suitable for use with standard drill presses, CNC turret machines, and hand drills equipped with a chuck accepting a 0.2656 inch straight-cylindrical shank. Fits any application within the 0.2500 to 0.3000 inch drill bit size range requiring screw machine length geometry.

Installation Notes

Secure the shank fully in the drill chuck before operation and verify chuck runout is within acceptable limits to protect the cutting edge and diameter tolerance. Machinists and maintenance technicians should use appropriate cutting fluid for the workpiece material, particularly when drilling alloy steel, to maximize bit life. Wear appropriate eye protection and follow shop-floor safety protocols when operating drilling equipment. Inspect the split point and flutes for wear or chipping before each use; a damaged point will increase thrust and reduce hole quality.