Hertel 66691767 Cobalt Screw Machine Drill Bit Size 1

Product Description

The HERTEL 66691767 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 for fast penetration and reduced walking on entry. A titanium nitride (TiN) coating increases surface hardness and extends tool life in production drilling environments. At 0.2280 inches in diameter and 2.4375 inches overall length, it is sized for compact, close-tolerance work. Right-hand spiral flutes with a regular helix evacuate chips efficiently. The straight-cylindrical shank fits standard drill chucks without modification. Machinists, tool-and-die workers, and maintenance mechanics are the primary users.

This bit is suited for screw machine operations, CNC drilling, and manual drill press work where a short, rigid bit reduces deflection. The cobalt substrate handles stainless steel, high-alloy steels, cast iron, and other hard ferrous metals that would wear out standard high-speed steel tooling quickly. The web-thinned, parallel-web configuration lowers thrust requirements and improves centering accuracy. It is sold as a single unit and is a practical replacement bit for production and job-shop environments handling materials in the 0.2000-to-0.2500-inch drill size range.

Key Features

• Cobalt construction rated for heavy-duty drilling in hard and abrasive metals
• 135-degree split point reduces thrust and eliminates the need for a center punch on most surfaces
• TiN coating increases wear resistance and extends cutting life
• Screw machine length body provides added rigidity and reduced deflection compared to jobber-length bits
• Web-thinned parallel web lowers entry force and improves hole accuracy
• Right-hand spiral flutes for standard chuck compatibility and efficient chip evacuation

Compatibility

Designed as a direct-fit replacement screw machine drill bit for any standard drill chuck or collet accepting a 0.2280-inch straight-cylindrical shank.

Installation Notes

This bit is installed and removed by a licensed machinist or qualified maintenance technician using a standard keyed or keyless drill chuck. Ensure the machine is fully powered down and the spindle is locked before changing tooling. Apply cutting fluid appropriate for the workpiece material to maximize bit life and cut quality. Do not exceed the spindle speed recommended for cobalt tooling at this diameter in the relevant material.