Hertel 74131087 Cobalt Screw Machine Drill Bit Size 56

Product Description

The HERTEL 74131087 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including stainless steel, cast iron, and hard alloys. Built to Series HSCO135, it features a 135-degree split point that reduces walking and allows drilling without a center punch in most applications. The bit measures 1.375 inches overall length with a 0.5-inch flute length, making it well-suited for close-quarters drilling where standard-length bits cannot fit. With a wire gauge size of 56 (0.0465 inches decimal equivalent), it handles small-diameter precision work. The straight cylindrical shank and web-thinned parallel web construction support smooth chip evacuation and reduced thrust requirements.

This drill bit is intended for use in machine shop environments, production drilling, and field service applications where a short, rigid bit is preferred. It is suited for use in drill presses, CNC machines, and hand drills with appropriate chucks. The cobalt steel construction holds cutting edge integrity at elevated temperatures, making it a practical choice for machinists, millwrights, and industrial maintenance technicians working with ferrous and non-ferrous metals.

Key Features

• Wire gauge size 56 with 0.0465-inch decimal equivalent for small-diameter precision drilling
• 135-degree split point reduces bit walking and lowers required feed pressure
• Cobalt tool steel construction resists heat buildup when drilling hard metals
• Screw machine length (1.375 inches OAL) provides added rigidity in tight workspaces
• Web-thinned parallel web improves chip flow and reduces thrust
• Right-hand cutting, regular spiral flute, straight cylindrical shank for broad chuck compatibility

Compatibility

Designed as a screw machine length replacement drill bit for use with standard straight-shank drill chucks in sizes accommodating 0.0465-inch diameter tooling across drill presses, CNC equipment, and portable hand drills.

Installation Notes

Secure the straight shank firmly in the chuck before drilling and verify chuck capacity accommodates the shank diameter. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Use appropriate cutting fluid or lubricant when drilling hardened or stainless materials to extend bit life and maintain cut quality. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed.