Hertel 42151 Cobalt Jobber Drill Bit 19/64 in 135 Deg

Product Description

The HERTEL 42151 is a cobalt jobber-length drill bit designed for drilling through hard and abrasive materials including stainless steel, high-strength alloys, and hardened tool steels. Built from M35 cobalt steel, this bit offers superior heat resistance over standard high-speed steel tooling. The 135-degree split point reduces walking on entry and requires less feed force, making it well suited for precision work in metal fabrication, maintenance, and repair applications. At 4.375 inches overall length, it fits standard drill chucks in corded drills, drill presses, and CNC equipment. The bright uncoated finish preserves dimensional accuracy at the cutting edge.

This bit is intended for metalworking applications in industrial, commercial, and field maintenance settings. It is commonly used by machinists, pipefitters, electricians, and maintenance technicians who need reliable performance drilling ferrous and nonferrous metals. The 19/64-inch diameter and 3-1/16-inch flute length accommodate through-hole drilling in plate, pipe wall, and structural steel within the capacity of a standard jobber-length configuration. Regular spiral geometry provides consistent chip evacuation in most drilling setups.

Key Features

• M35 cobalt steel construction for heat resistance in hard-metal drilling
• 135-degree split point reduces feed force and prevents bit walking on entry
• Right-hand cutting spiral flute with 5xD flute-to-diameter ratio for consistent chip removal
• Bright uncoated finish maintains precise cutting-edge geometry
• Straight cylindrical shank fits standard 3-jaw drill chucks without adapters
• Two-flute regular spiral design compatible with drill press and hand-drill applications

Compatibility

Designed as a standard jobber-length drill bit for use in any drill press, hand drill, or CNC spindle accepting a straight cylindrical shank in the 0.2500 to 0.3000 inch diameter range.

Installation Notes

This bit is installed and used by machinists, pipefitters, and maintenance technicians working with metal. Secure the straight shank firmly in a properly sized drill chuck before operation. Always power down and de-energize the drill or press before changing bits. Use appropriate cutting fluid when drilling stainless steel or hardened alloys to extend tool life and maintain safe operating temperatures.