Hertel 4139770 Cobalt Jobber Drill Bit 13/32 in Tialn

Product Description

The HERTEL 4139770 is a cobalt jobber-length drill bit designed for heavy-duty holemaking in ferrous metals, stainless steel, and other hard materials. It features a TiAlN coating that reduces heat buildup at the cutting edge and extends tool life in demanding applications. The 135-degree split point allows the bit to self-center on contact, reducing the need for a center punch and minimizing walking on smooth surfaces. Web thinning reduces cutting resistance at the chisel edge. At 0.4062 inches in diameter with a 5-1/4 inch overall length, it fits standard drill chucks and is sized for production and maintenance drilling operations performed by machinists and general trade professionals.

This bit is suited for use in drill presses, CNC drilling setups, and handheld drills in production shops, fabrication environments, and maintenance facilities. The straight-cylindrical shank allows it to seat in standard three-jaw chucks without slipping under torque. The spiral flute design evacuates chips efficiently during through-hole and blind-hole drilling. It is appropriate for use in metal fabrication, mechanical contracting, and industrial maintenance work where a heavy-duty cobalt bit is specified over standard high-speed steel.

Key Features

• TiAlN coating reduces cutting-zone heat and extends edge life in hard and abrasive materials
• 135-degree split point self-centers and reduces walking on entry
• Web-thinned tapered web reduces thrust and cutting resistance
• Cobalt construction rated for heavy-duty drilling in hardened and alloyed steels
• Straight-cylindrical shank seats securely in standard drill chucks
• Right-hand spiral flute promotes efficient chip evacuation

Compatibility

Designed as an OEM-style replacement or direct-use jobber drill bit for standard three-jaw chuck applications requiring a 13/32 inch diameter cobalt bit with a straight-cylindrical shank.

Installation Notes

Installation is performed by machinists or qualified trade professionals using a drill press, magnetic drill, or handheld drill with a compatible three-jaw chuck. Secure the shank fully in the chuck before applying power and verify spindle speed is appropriate for the material and bit diameter. Use cutting fluid or coolant where the application permits to manage heat, even though this bit does not have coolant-through capability. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is present.