Hertel 42052 Cobalt Jobber Drill Bit 39/64 Inch 135 Degree

Product Description

The HERTEL 42052 is a cobalt jobber-length drill bit sized at 39/64 inch (0.6094 inch decimal) with a 135-degree split point. The cobalt construction provides heat resistance for drilling harder steels and stainless alloys where high-speed steel bits lose their edge. An oxide and gold coating reduces friction and extends tool life in demanding applications. The straight cylindrical shank fits standard drill chucks, and the regular spiral flute geometry promotes efficient chip evacuation during through-hole drilling. This bit is suited for machinists, pipefitters, maintenance technicians, and fabricators working in metal fabrication, mechanical rooms, or field service environments.

This bit is designed for right-hand cutting in metalworking applications including drilling mild steel, alloy steel, and harder ferrous materials. With a flute length of 5-3/16 inches and an overall length of 7-1/8 inches, it accommodates jobber-length reach requirements across a range of production and maintenance drilling tasks. Typical applications include drilling bolt holes, port openings, and clearance holes in structural and mechanical assemblies. It is sold individually and is appropriate for use in drill presses, hand drills, and magnetic base drills with compatible chuck sizes.

Key Features

• Cobalt construction resists heat buildup when drilling hard and abrasive metals
• 135-degree split point reduces walking and lowers thrust required at entry
• Oxide and gold coating reduces friction and improves wear resistance
• Regular spiral flute with 5xD flute-to-diameter ratio promotes chip clearance
• Straight cylindrical shank for compatibility with standard drill chucks
• Right-hand cutting direction for use with conventional drill rotation

Compatibility

Designed as a jobber-length replacement drill bit for use with standard drill chucks accepting a straight cylindrical shank in the 0.5000 to 0.6500 inch decimal inch size range.

Installation Notes

Installation of this drill bit is performed by machinists and maintenance trades using a drill press, hand drill, or magnetic base drill. Secure the straight shank firmly in the chuck before operation and verify chuck key removal prior to starting the machine. Use appropriate cutting fluid or coolant when drilling hard ferrous materials to preserve bit life and control heat. Follow applicable shop safety standards and wear eye protection during all drilling operations.