Hertel 74130527 Cobalt Drill Bit 3/4 Inch 135 Degree

Product Description

The HERTEL 74130527 is a screw machine length (stub length) cobalt drill bit designed for drilling stainless steel, tough alloys, and other hard ferrous materials. Built from high-speed cobalt steel, it runs a 135-degree split point that self-centers on contact and reduces the thrust needed to start the hole. At 5 inches overall length with a 3-1/8-inch flute length, this bit is shorter and stiffer than a jobber-length drill, making it well suited for operations where rigidity and chatter control matter. The straight cylindrical shank seats directly in drill chucks or collet holders without adapters. Intended for use by machinists, fabricators, and maintenance technicians working on production or repair applications.

This drill bit is designed for right-hand rotation and targets primary workpiece materials including stainless steel and tough alloys. The regular spiral flute geometry and web-thinned, parallel-web configuration help evacuate chips efficiently during deeper cuts. It fits applications where a standard jobber-length bit would flex or wander, such as close-tolerance drilling in structural components, equipment frames, or sheet metal stacks. The 0.750-inch diameter suits common bolt clearance and tapping operations in heavy industrial and maintenance environments.

Key Features

• 135-degree split point self-centers and reduces walking on hard materials
• Cobalt high-speed steel construction resists heat buildup when drilling stainless steel and tough alloys
• Screw machine (stub) length provides increased rigidity and reduced deflection versus jobber-length bits
• Web-thinned parallel web lowers cutting resistance and improves chip evacuation
• Straight cylindrical shank accepts standard drill chucks and collet holders without adapters
• Right-hand cutting direction, 2-flute regular spiral geometry for general drilling operations

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for screw machine length cobalt drill applications in the HSCO135 series, suited for drilling stainless steel and tough alloys with any standard drill press, CNC drilling center, or hand drill equipped with an appropriate chuck.

Installation Notes

Installation of this bit is performed by machinists and maintenance technicians using standard drill presses, milling machines, or CNC equipment. Secure the shank fully in the chuck or collet before beginning any drilling operation. When drilling stainless steel, use appropriate cutting fluid to manage heat and extend tool life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.