Hertel 74130477 Cobalt Drill Bit 9/16 Inch 135 Degree

Product Description

The HERTEL 74130477 is a screw machine length cobalt drill bit designed for drilling into stainless steel, tough alloys, and other hard materials that wear out standard high-speed steel tooling. At 9/16 inch diameter with a 4-inch overall length and a 2-1/2-inch flute length, this bit fits stub-length applications where rigidity matters more than reach. The 135-degree split point starts on contact without a center punch and reduces walking on hard, smooth surfaces. Right-hand cutting, two-flute regular spiral geometry, and a straight cylindrical shank make it compatible with standard drill chucks and CNC tool holders. A web-thinned, parallel web configuration reduces thrust requirements when cutting tough alloys.

Screw machine length bits like the 74130477 are a standard choice in production machining, fabrication shops, and maintenance environments where shorter flute length adds rigidity and reduces deflection. This bit is used in drill presses, machining centers, and hand-held power tools when working with stainless steel fastener holes, pipe flanges, structural components, or other high-strength alloy parts. The cobalt construction allows the bit to hold an edge at elevated cutting temperatures that would degrade standard M2 high-speed steel tooling.

Key Features

• Cobalt construction maintains edge hardness at high cutting temperatures for use on stainless steel and tough alloys
• 135-degree split point reduces walking and lowers required thrust force on hard materials
• Web-thinned parallel web further reduces entry resistance and improves chip evacuation
• Screw machine length at 4 inches overall provides added rigidity over jobber-length bits
• Straight cylindrical shank fits standard drill chucks and collet tool holders
• Right-hand, two-flute regular spiral geometry for conventional drilling applications

Compatibility

Designed as a direct-fit screw machine length drill bit for use in standard drill chucks, CNC machining centers, and drill presses accepting a straight cylindrical shank at 9/16 inch diameter.

Installation Notes

This bit is installed and serviced by machinists, tool-and-die technicians, and industrial maintenance mechanics. Secure the straight shank fully in the chuck or collet and confirm concentricity before use. Use appropriate cutting fluid or coolant when drilling stainless steel and tough alloys to manage heat buildup and prolong edge life. Always wear appropriate eye protection and secure workpieces firmly before drilling.