Hertel 04138533 Cobalt Jobber Drill Bit No 6 0.2040 in

Product Description

The HERTEL 04138533 is a cobalt jobber-length drill bit sized to wire gauge No. 6 (0.2040 inches decimal) with a 135-degree split point and oxide/gold coating. Cobalt construction provides increased heat and wear resistance compared to standard high-speed steel, making this bit well suited for drilling hard and abrasive materials including stainless steel, cast iron, and hardened alloys. The split point geometry reduces walking at drill entry and lowers thrust force, which translates to cleaner hole starts without a center punch. It is used by machinists, pipefitters, electricians, and HVAC fabricators who regularly drill into tough base metals on the job.

This bit fits standard jobber drill applications in both shop and field environments. With a flute length of 2.5 inches and an overall length of 3.75 inches, it fits most three-jaw chucks on portable drills, drill presses, and magnetic base drills. The straight-cylindrical shank at 0.2040 inches diameter seats securely in standard keyless or keyed chucks. Right-hand spiral flutes clear chips efficiently during through-hole and blind-hole operations. The heavy-duty grade designation indicates this bit is built for production-rate use rather than light-duty or occasional applications.

Key Features

• Cobalt construction resists heat buildup when drilling hard ferrous and non-ferrous metals
• 135-degree split point reduces drill walk and lowers entry thrust force
• Oxide and TiN coating improves surface hardness and extends cutting edge life
• Regular spiral flute with web-thinned, tapered web design promotes efficient chip evacuation
• Straight-cylindrical shank at 0.2040 inches fits standard drill chucks without adapters
• Heavy-duty grade rated for repeated use in production or high-cycle service applications

Compatibility

Designed as a jobber-series drill bit for use in any standard drill chuck accepting a straight-cylindrical shank at 0.2040 inches diameter, including portable hand drills, benchtop drill presses, and magnetic base drills used in metal fabrication and mechanical trade work.

Installation Notes

Secure the shank fully in a keyed or keyless chuck before operation and verify the chuck is tightened against all three jaw faces. Use cutting fluid or coolant when drilling hard alloys to preserve the cutting edge and prevent work hardening of the base material. Cobalt bits should not be sharpened with standard aluminum oxide wheels; use a green silicon carbide or CBN wheel to maintain proper point geometry. Wear ANSI-rated eye protection during all drilling operations.