Cleveland C14539 Cobalt Screw Machine Drill Bit Size 46

Product Description

The CLEVELAND C14539 is a cobalt screw machine length drill bit designed for high-performance drilling in demanding production and fabrication environments. Built to Series 2133 specifications, it carries a wire gauge size of 46, equal to 0.0810 inches in decimal diameter, with an overall length of 1.75 inches and a flute length of 0.75 inches. The 135-degree split point reduces walking on entry and lowers thrust load, while the M42 cobalt steel construction maintains hardness and edge retention at elevated cutting temperatures. Licensed HVAC technicians, machinists, and maintenance professionals specify this bit for short-hole, high-cycle applications where standard length drills are impractical.

This bit is suited for drilling alloy steel and aluminum in screw machine, CNC, and drill press operations where a compact stub-length tool is required. The straight cylindrical shank fits standard chucks without modification. Its right-hand cut and regular spiral flute geometry support efficient chip evacuation in both through-hole and blind-hole configurations. The parallel web and web-thinned design reduce cutting resistance on entry, making it well-suited for production runs in tight tolerances or close-clearance workpieces.

Key Features

• Wire size 46 — 0.0810 inch decimal diameter with a tolerance of +0.0000 to -0.0005 inches for precise, controlled fitment
• M42 cobalt construction provides superior heat resistance and edge retention compared to standard high-speed steel
• 135-degree split point reduces thrust and eliminates center-punch requirement on most materials
• Web-thinned, parallel web design lowers cutting resistance and improves chip flow
• Screw machine (stub) length at 1.75 inches overall allows use in confined spaces and short-travel applications
• Conforms to ASME B94.11M and DIN 1897 standards for dimensional consistency

Compatibility

Designed as an OEM-compatible screw machine length drill bit for use in standard straight-shank drill chucks; primary workpiece materials listed by the manufacturer are alloy steel and aluminum.

Installation Notes

This bit is installed and operated by machinists, tool-and-die technicians, and maintenance professionals using standard keyed or keyless drill chucks on screw machines, CNC lathes, or drill presses. Ensure the machine spindle is fully stopped and locked out before changing bits. Do not exceed recommended feed rates for the workpiece material, as cobalt bits can chip under excessive lateral load. Confirm chuck jaw condition and shank seating before operation to prevent runout that can widen the hole beyond tolerance.