Hertel 4140539 Cobalt Jobber Drill 2.50 Mm Tialn

Product Description

The HERTEL 4140539 is a cobalt jobber-length drill bit designed for production and maintenance drilling in tough materials. It measures 2.50 mm (0.0984 inches) in diameter with an overall length of 2.3594 inches and a flute length of 1.375 inches. The 135-degree split point reduces walking and lowers thrust requirements at entry, while the TiAlN coating improves heat resistance and extends tool life in demanding cutting conditions. Web-thinned and tapered-web construction supports chip evacuation. This drill is suited for licensed machinists, millwrights, and maintenance mechanics working in industrial, commercial, or job-shop environments.

The 4140539 is built for holemaking in stainless steel and hardened materials where standard high-speed steel bits lose their edge. The straight cylindrical shank fits standard drill chucks without modification. The regular spiral flute geometry handles a wide range of feed and speed combinations, making this bit a reliable choice for repetitive drilling in production settings as well as precision work in fabrication shops. It is sold individually but requires a minimum order of 12 units.

Key Features

• 2.50 mm (0.0984 inches) diameter with straight cylindrical shank for universal chuck compatibility
• 135-degree split point reduces entry thrust and eliminates the need for a center punch on most materials
• TiAlN coating improves thermal resistance and extends cutting life in stainless steel and hardened workpieces
• Cobalt construction maintains hardness at elevated temperatures generated by high-feed drilling
• Web-thinned, tapered-web design promotes chip evacuation and reduces cutting resistance
• Right-hand, regular spiral flute geometry rated heavy duty for demanding industrial applications

Compatibility

Designed as an OEM-style jobber drill replacement for applications requiring a 2.50 mm straight-shank drill bit in standard drill chucks, drill presses, and CNC machining centers.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance mechanics familiar with cutting tool safety. Secure the shank fully in the drill chuck and verify runout before beginning a cut. Always power down and lock out the machine before changing tooling. Follow the machine manufacturer's recommended speeds and feeds for cobalt drill bits when cutting stainless steel or hardened materials to avoid premature tool failure.