Hertel 74132028 Screw Machine Drill Bit Size 4 Cobalt

Product Description

The HERTEL 74132028 is a screw machine length drill bit engineered for high-performance drilling in tough materials. Built from cobalt high-speed steel and finished with a TiAlN (titanium aluminum nitride) coating, it handles heat and wear better than standard HSS bits. The 135-degree split point starts on contact without center-punching and reduces thrust. At 2-3/8 inches overall length, the screw machine format is shorter than jobber-length bits, making it the right choice for drilling in tight spaces or close-quarter setups on mills, drill presses, and CNC equipment. Licensed machinists and tool-and-die professionals are the primary users of this bit.

This drill bit suits production and maintenance drilling applications in shops working with stainless steel, alloy steel, cast iron, and other hard or abrasive materials. The TiAlN coating sustains cutting performance at elevated temperatures, extending tool life in high-cycle environments. The straight-cylindrical shank fits standard drill chucks without modification, and the right-hand spiral flute clears chips efficiently in both through-hole and blind-hole operations.

Key Features

• Cobalt high-speed steel construction for heat resistance in hard materials
• TiAlN coating extends tool life in high-temperature cutting applications
• 135-degree split point reduces thrust and eliminates the need for center-punching
• Screw machine length (2-3/8 inches OAL) improves rigidity and access in confined setups
• Web-thinned, parallel web configuration reduces cutting resistance
• Right-hand spiral flute provides efficient chip evacuation

Compatibility

Designed as an OEM-style replacement or direct drop-in drill bit for standard drill chucks and CNC tool holders accepting a straight-cylindrical shank in the 0.2000 to 0.2500 inch drill bit size range.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or tool operators familiar with cutting tool setup and machine operation. Secure the straight-cylindrical shank firmly in the chuck before operation and verify runout before cutting. Follow machine manufacturer guidelines for feed rate and spindle speed appropriate to the workpiece material. Ensure the machine is fully powered down and locked out before changing tooling.