Cleveland C70206 Cobalt Jobber Drill Bit Wire 73

Product Description

The CLEVELAND C70206 is a cobalt jobber length drill bit in wire gauge size 73, with a decimal diameter of 0.0240 inches. Built from M42 cobalt high-speed steel and finished with a gold oxide coating, this bit is rated for heavy-duty service in precision drilling applications. The 135-degree split point geometry reduces walking on entry and lowers the thrust force needed to start a hole. Overall length is 1-1/8 inches, with a flute length of 5/16 inch and a straight-cylindrical shank measuring 0.0240 inches in diameter. Licensed machinists, tool and die technicians, and field service pros handling precision metalwork reach for this bit when tight diameter tolerances matter. Diameter tolerance is held to -0.0005 to 0.0000 inches, consistent with NAS 907 Type J specification.

The C70206 is designed for right-hand, spiral-flute drilling in aluminum and similar non-ferrous or light-alloy workpieces, though the M42 cobalt matrix also handles harder materials with appropriate feed and speed settings. The regular spiral and web-thinned, tapered web configuration improve chip evacuation in through-hole and blind-hole work. This bit is sold individually and is a common choice in production environments where small-diameter precision holes are required repeatedly, including aerospace, electronics, and HVAC equipment fabrication. Minimum order quantity is 12 units per order.

Key Features

• M42 cobalt steel construction for elevated heat resistance and extended tool life compared to standard HSS
• 135-degree split point reduces thrust and prevents bit walking without a center punch
• Gold oxide coating provides lubricity and corrosion resistance during service
• Web-thinned, tapered web improves chip flow and reduces cutting resistance in small-diameter holes
• Diameter tolerance of -0.0005 to 0.0000 inches meets NAS 907 Type J standards
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement or production consumable for applications requiring NAS 907 Type J wire gauge drill bits in size 73 (0.0240 inches). Primary workpiece material compatibility listed as aluminum; suitable for use in standard drill presses, CNC machining centers, and handheld electric drills with collet or keyless chucks accepting a 0.0240-inch straight shank.

Installation Notes

Secure the shank fully in the chuck before operation and verify runout before drilling into finished workpieces. Power down and de-energize any machine tool before bit changes. Use appropriate cutting fluid or lubricant when drilling aluminum or alloy materials to extend bit life and improve hole finish. Do not exceed the manufacturer-recommended feed rate for this diameter class, as small-diameter cobalt bits are susceptible to breakage under side load or excessive feed pressure.