Hertel 66691890 Drill Bit Size 13 Cobalt Tin 135 Deg

Product Description

The HERTEL 66691890 is a screw machine length drill bit designed for high-speed, high-precision drilling in metal fabrication, machining, and maintenance applications. Built from heavy-duty cobalt steel with a titanium nitride (TiN) coating, it delivers extended tool life in tough materials including stainless steel, cast iron, and hardened alloys. The 135-degree split point reduces walking and allows drilling without a center punch on most surfaces. At 2-3/16 inches overall length, the stub-style body provides added rigidity over jobber-length bits, making it well-suited for drill press and CNC operations where chatter and deflection are concerns.

This bit fits standard screw machine and production drilling setups. Wire size 13 corresponds to 0.1850 inch diameter, placing it in the 0.1500 to 0.2000 inch size range. It is commonly used by machinists, tool-and-die technicians, maintenance mechanics, and industrial tradespeople working with ferrous and non-ferrous metals. The straight cylindrical shank seats securely in Jacobs-style chucks and quick-change holders used on drill presses, lathes, and CNC machining centers.

Key Features

• Cobalt steel construction for heat resistance in hard and abrasive materials
• TiN coating extends surface hardness and reduces friction at the cutting edge
• 135-degree split point starts on contact, minimizing drill walking
• Web-thinned parallel web reduces thrust and improves chip evacuation
• Stub screw machine length adds rigidity and reduces deflection versus jobber bits
• Right-hand spiral flute with regular helix for reliable chip clearing

Compatibility

Designed as a direct-fit screw machine length drill bit for use in standard straight-shank chucks and collet holders accepting 0.1850 inch shank diameter tooling.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with rotating cutting tools. Ensure the drill press, lathe, or CNC spindle is fully powered down and locked out before changing bits. Seat the straight cylindrical shank fully into the chuck and tighten securely before operation. Use appropriate cutting fluid or coolant for the material being drilled to preserve coating life and edge integrity.