Hertel 74130808 Cobalt Screw Machine Drill Bit Size 28

Product Description

The HERTEL 74130808 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including alloy steels, stainless steel, and other hard metals. Built to Series HSCO135 standards, it features a 135-degree split point for fast penetration and reduced walking on startup without a center punch. The overall length is 1-15/16 inches with a 15/16-inch flute length, making it compact and rigid for short-reach drilling applications. Finished with a straw coating, this bit handles elevated heat generated during aggressive drilling cycles. It is sized to wire gauge Number 28, equivalent to 0.1405 inches in decimal diameter.

This drill bit is suited for use in machine shop environments, production drilling operations, and maintenance repair work where a short, rigid bit is required for accuracy in tight setups. The screw machine length profile reduces deflection compared to jobber-length bits, making it a common choice for drilling in drill presses, CNC machines, and turret lathes. Right-hand cutting direction and straight cylindrical shank allow direct chucking into standard drill chucks and collet holders.

Key Features

• Cobalt construction provides heat and wear resistance in hard and abrasive materials
• 135-degree split point reduces thrust force and eliminates center-punch requirement
• Web-thinned parallel web design improves chip evacuation and cutting efficiency
• Screw machine length body increases rigidity and reduces bit deflection during drilling
• Regular spiral flute with right-hand cutting direction for standard drilling applications
• Straight cylindrical shank fits standard drill chucks and collet systems without modification

Compatibility

Designed as an OEM-style replacement or direct-use cobalt drill bit for machine shop and production applications requiring a wire gauge Number 28 diameter in screw machine length format.

Installation Notes

This bit is installed by machinists and toolroom technicians using standard drill chucks or collet holders. Ensure the shank is fully seated and the chuck is tightened securely before operation. Use appropriate cutting fluid or coolant for the material being drilled to extend tool life, noting this bit does not support coolant-through delivery. Follow shop safety protocols including proper RPM selection for the bit diameter and material.