Hertel 4140067 Cobalt Jobber Drill Bit Wire Size 12

Product Description

The HERTEL 4140067 is a cobalt jobber-length drill bit in wire gauge size 12, measuring 0.1890 inches in diameter. It features a 135-degree split point for fast, accurate self-centering starts without a center punch. The TiAlN coating adds heat resistance and extends tool life in demanding applications. At 3.5 inches overall length with a 2.3125-inch flute, this is a standard jobber geometry suited to drill press, milling machine, or hand-held power drill use. Designed for heavy-duty service, the web-thinned, tapered web reduces thrust load and improves chip evacuation in deep holes. Right-hand spiral flute construction moves chips up and out efficiently.

This bit is built specifically for drilling stainless steel and other hardened materials where high-speed steel tooling loses its edge quickly. The cobalt alloy substrate handles the elevated temperatures generated when cutting austenitic stainless, tool steel, and similar tough workpieces. It is a go-to choice for fabricators, maintenance machinists, pipefitters, and industrial service technicians who regularly work with stainless fastener clearance holes, structural members, or hard plate. The straight cylindrical shank fits standard drill chucks without adapters. Sold individually.

Key Features

• Cobalt construction for sustained hardness and heat resistance in stainless steel and hardened materials
• TiAlN coating extends wear life and reduces friction at the cutting edge
• 135-degree split point enables self-centering starts and reduces walking on hard surfaces
• Web-thinned, tapered web lowers thrust requirements and improves chip flow
• Regular right-hand spiral flute clears chips effectively in through-hole and blind-hole applications
• Straight cylindrical shank fits standard drill chucks without special toolholders

Compatibility

Designed as a heavy-duty jobber-length drill bit for use in stainless steel and hardened materials. Fits any standard drill chuck accepting a 0.1890-inch straight shank.

Installation Notes

Drill bits of this type are installed and removed by a licensed machinist or qualified tradesperson using a keyed or keyless drill chuck. Always ensure the machine spindle is fully stopped and power is locked out before changing tooling. Use appropriate cutting fluid or coolant when drilling stainless steel to manage heat buildup, even though this bit does not support through-coolant. Set drill speed according to material hardness and bit diameter to avoid premature edge wear.