Hertel 4140760 Cobalt Jobber Drill Bit 6.40 Mm

Product Description

The HERTEL 4140760 is a cobalt jobber-length drill bit designed for production drilling in tough materials. It measures 6.40 mm (0.2520 inches) in diameter with an overall length of 4.1406 inches and a flute length of 2.875 inches. The 135-degree split point reduces walking and requires no center punch on most surfaces. A TiAlN coating improves heat resistance and extends tool life when drilling at high speeds or without coolant. This bit uses a regular spiral flute and straight cylindrical shank, making it compatible with standard drill chucks. It is suited for machinists, maintenance technicians, and trade professionals who drill into stainless steel or hardened materials regularly.

This bit is rated for holemaking in stainless steel and hardened materials, where standard HSS bits lose their edge quickly. The heavy-duty cobalt construction maintains hardness at elevated cutting temperatures. It fits typical production and maintenance drilling scenarios in fabrication shops, HVAC equipment manufacturing, and industrial service environments. The straight shank seats in any standard keyed or keyless chuck without adapters. Right-hand cutting direction is standard for conventional drill presses, hand drills, and CNC spindles.

Key Features

• TiAlN coating improves thermal resistance and reduces built-up edge on stainless steel
• 135-degree split point self-centers and reduces thrust force required to start a hole
• Web-thinned, tapered web configuration improves chip evacuation in deep holes
• Cobalt construction retains hardness at high cutting temperatures where HSS fails
• Regular spiral flute for consistent chip flow in general-purpose holemaking
• Heavy-duty grade rated for stainless steel and hardened material applications

Compatibility

Designed as an OEM-style jobber drill for use in standard drill chucks accepting a 0.2520-inch straight cylindrical shank, suitable for drill presses, hand drills, and CNC machines set up for right-hand cutting.

Installation Notes

A licensed machinist or qualified maintenance technician should select appropriate cutting speed and feed rate for the workpiece material before use. Secure the workpiece firmly before drilling to prevent movement. When drilling stainless steel or hardened materials, use cutting fluid where possible to extend bit life, even though this bit does not support coolant-through delivery. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed.