Chicago-latrobe 46747 Cobalt Drill Bit Wire 77 0.0180 in

Product Description

The CHICAGO-LATROBE 46747 is a cobalt jobber length drill bit in wire gauge size 77, with a decimal diameter of 0.0180 inches. Built from M42 cobalt high-speed steel and finished with a gold oxide coating, it is engineered for high-performance drilling in hard and abrasive materials, including titanium. The 135-degree split point reduces walking on entry without a center punch. Overall length is 7/8 inches with a 3/16-inch flute length. This bit is designed for use by machinists, aerospace technicians, maintenance professionals, and tool-and-die tradespeople working with tight-tolerance, small-diameter applications.

The 46747 is suited for precision drilling in titanium, stainless steel, hardened alloys, and other difficult-to-machine workpiece materials. Its web-thinned, tapered web construction reduces thrust and improves chip evacuation in deep or blind holes. The straight-cylindrical shank seats securely in standard drill chucks and collets. This bit is a practical choice for production environments requiring consistent, repeatable hole geometry in hard metal substrates at diameters below 0.020 inches.

Key Features

• M42 cobalt steel construction delivers heat resistance and edge retention in hard metals
• Gold oxide coating reduces friction and provides visual wear indication
• 135-degree standard split point minimizes bit walking on hard surfaces
• Web-thinned tapered web lowers drilling thrust and improves chip clearance
• Regular spiral flute with right-hand cut for standard drilling operations
• Conforms to DIN 338 and NAS 907 Type J standards for precision tooling

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for applications requiring wire gauge size 77 drill bits per NAS 907 Type J and DIN 338 specifications. Compatible with standard drill chucks and collets accepting a 0.0180-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance tradespeople familiar with small-diameter precision tooling. Secure the straight-cylindrical shank firmly in a properly sized drill chuck or collet before operation to prevent slippage at high RPM. Use appropriate cutting fluid for titanium and hard alloy work to manage heat buildup and extend tool life. Inspect the cutting edges before each use, as cobalt bits at this diameter are susceptible to breakage if fed at excessive rates.