Cleveland C14593 Screw Machine Drill Bit 21 Cobalt

Product Description

The CLEVELAND C14593 is a screw machine length drill bit sized to wire gauge 21 (0.1590 inches decimal), built from M42 cobalt high-speed steel for heavy-duty cutting performance. It features a 135-degree split point that reduces walking on entry and lowers required thrust force, making it well suited for production drilling in hard and abrasive materials. The overall length is 2.125 inches with a 1.0625-inch flute length, keeping the tool compact and rigid for short-hole applications. A web-thinned, parallel-web construction further reduces cutting resistance. Licensed tradespeople and machinist-level technicians working in fabrication, mechanical, or industrial maintenance settings are the primary installers of this type of tooling.

This drill bit is designed for use in screw machine operations, CNC drilling setups, drill presses, and hand-held power drills where a stub-length bit provides added stability and reduced deflection. It is appropriate for drilling alloy steel and aluminum workpieces. The straight-cylindrical shank at 0.1590 inches diameter fits standard drill chucks without adapters. The two-flute spiral design with regular helix promotes efficient chip evacuation during through-hole and blind-hole drilling in production environments.

Key Features

• M42 cobalt construction rated for heavy-duty cutting in alloy steel and aluminum
• 135-degree split point reduces entry walking and lowers feed force
• Web-thinned parallel web minimizes cutting resistance
• Screw machine (stub) length provides increased rigidity and reduced deflection
• Right-hand cut with two-flute regular spiral for consistent chip removal
• Meets ASME B94.11M and DIN 1897 standards

Compatibility

Designed as an OEM-style replacement or direct-fit option for screw machine length drill bit applications requiring a wire size 21 (0.1590 inch) straight-cylindrical shank bit in Series 2133 tooling programs.

Installation Notes

Installation of this bit is performed by machinists or maintenance technicians familiar with rotary cutting tools. Secure the straight-cylindrical shank firmly in the drill chuck before operation and verify chuck runout is within acceptable tolerance to preserve diameter accuracy. Diameter tolerance on this bit is +0.0000 to -0.0007 inches, so chuck condition directly affects hole quality. Always use appropriate cutting fluid or coolant for the workpiece material, and confirm spindle speed and feed rate are appropriate for the workpiece before starting the cut.