Hertel 04138228 Cobalt Jobber Drill Bit 7/64 in

Product Description

The HERTEL 04138228 is a cobalt jobber-length drill bit designed for heavy-duty holemaking in ferrous and hard materials. Built from cobalt steel with an oxide finish, it resists heat and wear during high-speed drilling. The 135-degree split point reduces walking on contact and lowers the thrust needed to start the hole. The web-thinned, tapered-web geometry improves chip evacuation through the spiral flute. At 2-5/8 inches overall length with a 1-1/2-inch flute length, this is a standard jobber-series geometry suited for use in drill presses, CNC machines, and hand-held power drills. Machinists, pipefitters, and sheet-metal fabricators are the primary users.

This drill bit is sized at 7/64 inch (0.1094 inch decimal equivalent), placing it in the 0.1000 to 0.1500 inch diameter range. It is well-suited for production drilling in steel, stainless, cast iron, and other hard alloys where standard high-speed steel bits lose their edge prematurely. The straight-cylindrical shank fits standard drill chucks without adapters. Right-hand cutting direction matches conventional drill press and hand-drill operation. Single-unit packaging allows individual replacement or sampling before committing to larger quantities.

Key Features

• Cobalt steel construction with oxide finish for heat resistance and extended tool life in hard materials
• 135-degree split point reduces drill walk and starting thrust
• Web-thinned, tapered-web geometry improves chip evacuation and reduces torque demand
• Regular spiral flute, 1-1/2 inches in length, clears chips efficiently in through-hole and blind-hole applications
• Straight-cylindrical shank fits standard three-jaw chucks without sleeves or adapters
• Heavy-duty grade rated for production holemaking in ferrous and difficult-to-machine alloys

Compatibility

Designed as a jobber-series drill bit for use in standard drill chucks accepting a 7/64-inch straight-cylindrical shank, compatible with drill presses, CNC drilling machines, and portable power drills used in metal fabrication and maintenance applications.

Installation Notes

Installation of this drill bit is performed by machinists, pipefitters, or maintenance technicians using standard drill press or hand-drill equipment. Ensure the chuck is fully tightened and the shank is seated completely before operating. Use appropriate cutting fluid or coolant for the workpiece material to preserve edge life, noting that this bit does not support coolant-through delivery. Always wear eye protection and secure the workpiece before drilling.