Hertel 4140042 Cobalt Jobber Drill Bit Wire 10 135 Deg

Product Description

The HERTEL 4140042 is a cobalt jobber-length drill bit designed for demanding holemaking applications in metal fabrication and industrial trades. Built from heavy-duty cobalt steel and coated with TiAlN for heat and wear resistance, this bit handles hard and abrasive materials where high-speed steel falls short. The wire size 10 designation equals 0.1935 inches in diameter. It features a 135-degree split point for fast starts without center-punching, a web-thinned and tapered web configuration to reduce thrust, and a right-hand spiral flute for efficient chip evacuation. Overall length is 3.625 inches with a 2.4375-inch flute length.

This bit is suited for machinists, maintenance technicians, pipefitters, HVAC installers, and electricians who regularly drill through steel, stainless, cast iron, or other hard metals. The straight-cylindrical shank at 0.1935 inches fits standard three-jaw chucks on drill presses, hand drills, and right-angle drills. The regular spiral and jobber-series length make it a standard reach choice for general-purpose through-hole drilling where a shorter stub bit would be insufficient and an extended-length bit unnecessary.

Key Features

• Cobalt construction rated for heavy-duty use in hard and abrasive materials
• TiAlN coating increases surface hardness and heat resistance at the cutting edge
• 135-degree split point self-centers on contact, reducing or eliminating center-punch requirements
• Web-thinned tapered web lowers axial thrust and reduces feed force
• Right-hand spiral flute promotes chip clearing in through-hole applications
• Straight-cylindrical shank compatible with standard drill chucks

Compatibility

Designed as a standard jobber-length drill bit for use in any drill press, hand drill, or right-angle drill fitted with a chuck that accepts a 0.1935-inch straight-cylindrical shank.

Installation Notes

This bit is installed and replaced by machinists, maintenance technicians, and trade professionals using standard drill chucks. Ensure the chuck is fully tightened and the workpiece is properly secured before drilling. Use appropriate cutting fluid or lubricant when drilling hard metals to extend bit life and maintain cutting performance. Replace the bit when cutting edge wear is visible or feed force increases noticeably.