Cleveland C71239 Jobber Length Drill Bit 3.4 Mm Hss

Product Description

The CLEVELAND C71239 is a jobber-length twist drill bit designed for general-purpose hole-making in metal, wood, and plastic. It features a 3.4 mm (0.1339 inch) diameter, a 118-degree standard point angle, and a high-speed steel construction with an oxide coating that provides basic lubricity and corrosion resistance. The two-flute spiral design with a tapered web and web-thinned point reduces thrust and improves chip evacuation. At 2.756 inches overall length with a 1.535-inch flute length, it fits standard drill chucks and is appropriate for bench drill presses, hand drills, and CNC drilling applications. Machinists, maintenance techs, and fabricators are the primary users.

This bit is suited for general-purpose drilling in light manufacturing, maintenance and repair, and fabrication environments. It is built to DIN 338 and ASME B94.11M standards, placing it in the 3.00 to 4.00 mm diameter class and the 0.1000 to 0.1500 inch decimal inch size range. The regular spiral type and 4xD flute-by-diameter ratio make it appropriate for through-hole drilling in mild steel, aluminum, brass, and similar materials at moderate cutting speeds. The straight-cylindrical shank fits standard keyless and keyed chucks without adapters.

Key Features

• 3.4 mm (0.1339 inch) diameter with a diameter tolerance of -0.0007 to 0.0000 inches for close-tolerance hole sizing
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High-speed steel construction with oxide finish for basic wear and corrosion resistance
• Two-flute regular spiral design with 4xD flute ratio promotes efficient chip removal
• Straight-cylindrical shank at 0.1339 inch diameter fits standard drill chucks directly
• Meets ASME B94.11M and DIN 338 standards for consistent dimensional accuracy

Compatibility

Designed as a general-purpose jobber-length drill bit conforming to DIN 338 and ASME B94.11M, suitable for use in any standard drill chuck accepting a 0.1339-inch straight-cylindrical shank.

Installation Notes

Secure the shank fully in the chuck and verify runout before drilling. Use appropriate cutting fluid or coolant when drilling steel to extend tool life and maintain hole quality. Ensure the workpiece is firmly clamped before beginning the cut. Follow applicable shop safety practices and machine guarding requirements during operation.