Hertel 74130634 Cobalt Screw Machine Drill Bit Size 12

Product Description

The HERTEL 74130634 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials where standard high-speed steel bits fall short. Built to Series HSCO135 standards, it features a 135-degree split point that starts on contact without a center punch and reduces thrust during entry. The overall length is 2.25 inches with a flute length of 1.1875 inches, keeping the setup compact and rigid for short-hole work in drill presses, CNC machines, and production drilling fixtures. Two regular spiral flutes clear chips efficiently, and the web-thinned parallel web reduces cutting resistance. Installation and use are suited to machinists and production shop technicians working in ferrous metals, stainless, and other hard alloys.

Screw machine length bits are the standard choice when rigidity matters more than depth reach. This bit fits applications in production machining, sheet metal fabrication, and general metalworking where a shorter flute length reduces deflection and chatter. The straight cylindrical shank seats cleanly in standard drill chucks and collet holders. At 0.1890 inches diameter (wire gauge size 12), it falls in the 0.1500 to 0.2000 inch drill bit size range, making it a common selection for tapping prep, clearance holes, and close-tolerance drilling in steel and stainless components.

Key Features

• Cobalt construction for heat resistance and extended tool life in hard and abrasive materials
• 135-degree split point starts on contact, reducing walking and eliminating the need for a center punch
• Web-thinned parallel web lowers thrust requirements during drilling
• Compact screw machine length body at 2.25 inches OAL improves rigidity and reduces deflection
• Right-hand cutting with regular spiral flutes for reliable chip evacuation
• Straight cylindrical shank fits standard drill chucks and collet holders without adapters

Compatibility

Designed as an OEM-style replacement and standard-stock drill bit for production machining applications requiring a wire gauge size 12, straight-shank cobalt bit with a 135-degree split point geometry.

Installation Notes

Install in a drill press, CNC machining center, or hand drill with a properly sized chuck or collet rated for straight-shank tooling. Secure the shank fully and verify runout before drilling to protect both the bit and the workpiece. Use appropriate cutting fluid or coolant for the base material being drilled, especially when working with stainless steel or other work-hardening alloys. Inspect the cutting edges before each use and remove the bit from service if chipping or wear is visible at the point.