Hertel 66692062 Cobalt Screw Machine Drill Bit Size 30

Product Description

The HERTEL 66692062 is a cobalt screw machine length drill bit designed for high-performance drilling in tough materials. Built to heavy-duty grade standards, this bit features a 135-degree split point that reduces walking and requires no center punch on most surfaces. The TiN (titanium nitride) coating extends tool life by reducing friction and heat buildup during cutting. At 1-15/16 inches overall length, the stub-length body provides increased rigidity compared to jobber-length bits, making it well suited for precision work in tight spaces. Machinists, tool-and-die workers, and fabricators install this bit in drill presses, CNC machines, and hand-held power drills.

This bit is sized at wire gauge Number 30, corresponding to 0.1285 inch decimal diameter. It is used in applications requiring precise small-diameter holes in stainless steel, hardened steel, cast iron, titanium, and other hard-to-machine alloys where high-speed steel bits wear prematurely. Screw machine length geometry makes it a standard choice for production drilling, fixture work, and applications where bit deflection must be minimized. The straight-cylindrical shank fits standard drill chucks without adapters.

Key Features

• Cobalt construction provides superior heat and wear resistance in hard and abrasive materials
• TiN coating reduces friction and extends cutting life compared to uncoated cobalt bits
• 135-degree split point starts on contact, reducing thrust force and eliminating walking
• Web-thinned parallel web lowers cutting resistance and improves chip evacuation
• Screw machine (stub) length increases rigidity and reduces deflection versus jobber-length bits
• Right-hand spiral flute with regular helix for reliable chip clearing in through-hole and blind-hole applications

Compatibility

Designed as a direct-fit replacement for Number 30 wire gauge screw machine length drill bits used in standard drill press chucks, CNC turret setups, and hand-held power drill applications requiring a straight-cylindrical shank at 0.1285 inch diameter.

Installation Notes

This bit is installed and changed by machinists or maintenance technicians using a standard keyed or keyless chuck. Always power down and lock out the machine spindle before changing tooling. Ensure the shank is fully seated and the chuck is tightened evenly to prevent runout. Use appropriate cutting fluid or coolant for the workpiece material to maximize tool life, noting this bit does not support internal coolant-through delivery.