Hertel 74130790 Screw Machine Drill Bit Size 27 Cobalt

Product Description

The HERTEL 74130790 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including stainless steel, hardened alloys, and heat-resistant metals. Built to the HSCO135 series standard, it features a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. The web-thinned geometry lowers thrust requirements and improves chip evacuation. At 2-1/16 inches overall length, this stubby format provides added rigidity for precision work in CNC machining centers, drill presses, and hand-held applications where flex and deflection must be minimized. Sold as a single bit with a right-hand cutting direction and a straight cylindrical shank.

This bit is suited for machine shops, fabrication environments, and production drilling operations where dimensional accuracy and repeatability are critical. The screw machine length profile is commonly used in turret lathes, automatic screw machines, and CNC drilling fixtures. The cobalt construction with a straw finish handles elevated heat generated during continuous-duty drilling cycles without sacrificing edge retention. Typical users include machinists, tool-and-die technicians, and industrial maintenance professionals working with ferrous and non-ferrous metals.

Key Features

• Cobalt construction for superior heat and wear resistance in hard metals
• 135-degree split point for self-centering entry and reduced thrust
• Web-thinned, parallel web configuration improves chip flow and reduces cutting load
• Screw machine length (2-1/16 inches OAL) provides added rigidity over jobber-length bits
• Right-hand cutting, regular spiral flute for standard drilling applications
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed for use in drill presses, CNC machining centers, turret lathes, and automatic screw machines accepting a straight-shank bit in the Size 27 wire gauge range (0.1440 inches decimal equivalent).

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with cutting tool safety. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before operation. Always power down and de-energize the machine before changing tooling. Do not exceed the recommended RPM range for the bit diameter and material being drilled.