Cleveland C70190 Cobalt Drill Bit No. 57 0.0430 in

Product Description

The CLEVELAND C70190 is a cobalt jobber-length drill bit designed for precision drilling in demanding trade and industrial applications. Built from M42 cobalt high-speed steel and finished with a gold oxide coating, this bit delivers enhanced heat and wear resistance compared to standard HSS tooling. It features a 135-degree split point for fast penetration and reduced walking on entry, a two-flute regular spiral configuration, and a web-thinned, tapered web design for improved chip evacuation. The straight-cylindrical shank measures 0.0430 inches in diameter and seats securely in standard drill chucks. Overall length is 1.75 inches with a flute length of 0.75 inches.

This drill bit is suited for metalworking and fabrication environments where aluminum and similar non-ferrous or soft ferrous materials are drilled regularly. The No. 57 wire gauge size (0.0430 inches) is a common choice for precision hole sizing in electronics, aerospace component work, and light mechanical fabrication. It is sized and ground to NAS 907 Type J standards, making it appropriate for shops and contractors requiring specification-controlled tooling. Machinists, maintenance technicians, and trade professionals installing or fabricating metal components will find this bit a reliable production choice.

Key Features

• M42 cobalt HSS construction for high heat resistance and extended tool life in hard or abrasive materials
• Gold oxide coating reduces friction and improves chip flow
• 135-degree split point promotes accurate entry and faster penetration with less feed pressure
• Web-thinned tapered web improves chip evacuation and reduces thrust load
• Two-flute regular spiral design provides balanced cutting action
• Meets NAS 907 Type J specification for controlled-tolerance applications

Compatibility

Designed as an OEM-style replacement and production-grade jobber drill bit for use in standard drill chucks and drill presses accepting a 0.0430-inch straight-cylindrical shank. Primary workpiece material compatibility listed as aluminum per manufacturer specification data.

Installation Notes

Installation and use of this bit should be performed by machinists or qualified trade technicians familiar with drilling equipment and tooling safety. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before operation. Use appropriate cutting fluid or coolant when drilling ferrous materials to prolong bit life, even though this bit does not support coolant-through delivery. Inspect the cutting edges and point geometry before each use and replace the bit if chipping or wear is observed.