Hertel 4139622 Cobalt Jobber Drill Bit 11/64 Inch

Product Description

The HERTEL 4139622 is a cobalt jobber-length drill bit designed for heavy-duty holemaking in ferrous and hard materials. It features a TiAlN (titanium aluminum nitride) coating that increases surface hardness and heat resistance, extending tool life in demanding drilling applications. The 135-degree split point reduces walking and lowers thrust requirements at entry, making it well-suited for production drilling without a center punch. The right-hand spiral flute efficiently evacuates chips, and the web-thinned, tapered web configuration supports clean, accurate holes through a range of workpiece materials.

This jobber drill is appropriate for metalworking and fabrication environments where a balance of reach and rigidity is needed. The straight-cylindrical shank fits standard three-jaw drill chucks across a wide range of drill presses, lathes, and hand-held power drills. It is used by machinists, maintenance technicians, pipefitters, and ironworkers for general holemaking in steel, stainless, and other hard alloys. The 11/64-inch diameter falls within the 0.1500 to 0.2000 decimal-inch size range, making it a common selection for tapping preparation and close-tolerance work.

Key Features

• Cobalt construction provides elevated heat and wear resistance over standard high-speed steel
• TiAlN coating adds surface hardness and reduces friction for longer tool life in hard materials
• 135-degree split point minimizes walking and reduces required entry thrust
• Web-thinned, tapered web improves cutting efficiency and chip evacuation
• Right-hand, regular spiral flute clears chips effectively in through-hole and blind-hole applications
• Straight-cylindrical shank is compatible with standard drill chucks without adapters

Compatibility

Designed as a standard jobber-series drill bit for use in any drill press, CNC machine, lathe tailstock, or hand-held power drill equipped with a three-jaw chuck sized for an 11/64-inch straight shank.

Installation Notes

Installation is performed by machinists and maintenance trades. Secure the straight shank fully in the chuck and verify concentricity before drilling. Use appropriate cutting fluid or coolant for the workpiece material to maximize coating and tool life. Follow machine manufacturer guidelines for spindle speed and feed rate based on workpiece material and bit diameter.