Hertel 04138277 Cobalt Jobber Drill 3/16 in 135 Deg

Product Description

The HERTEL 04138277 is a cobalt jobber-length drill bit designed for heavy-duty holemaking in ferrous and high-hardness materials. Built from cobalt steel with an oxide and TiN coating, it handles the elevated heat and wear associated with drilling alloy steels, stainless, and hardened workpieces. The 135-degree split point geometry reduces walking on entry and lowers thrust requirements compared to standard 118-degree points. The web-thinned, tapered web design further reduces cutting resistance. At 3.5 inches overall length with a 2.3125-inch flute, this bit fits standard drill chucks and drill presses used across machining, fabrication, and industrial maintenance applications.

This drill bit is suited for metalworking and fabrication environments where standard high-speed steel bits wear prematurely. Typical applications include drilling mild steel, stainless steel, cast iron, and hard alloys in manufacturing facilities, machine shops, and maintenance settings. The 3/16-inch diameter makes it a common size for bolt clearance holes, pilot holes, and precision holemaking tasks requiring consistent performance across production runs.

Key Features

• Cobalt steel construction for increased heat and wear resistance in hard materials
• 135-degree split point reduces bit walking and lowers drilling thrust
• Web-thinned tapered web improves chip evacuation and cutting efficiency
• Oxide and TiN coating adds surface hardness and lubricity
• Right-hand spiral flute clears chips effectively in through-hole and blind-hole applications
• Straight-cylindrical shank fits standard 3-jaw chucks without adapters

Compatibility

Designed as a jobber-series replacement drill bit for use in standard drill chucks, drill presses, and CNC machining centers accepting a 3/16-inch straight shank.

Installation Notes

Installation is performed by machinists, toolmakers, and maintenance technicians using standard drill press or hand-drill equipment. Secure the shank fully in the chuck before operation and verify chuck key is removed before powering on. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life. Inspect the cutting edges for chipping or wear before each use and replace bits that show signs of dulling to maintain hole quality and prevent workpiece damage.