Hertel 74146937 Taper Length Drill Bit Size 8 Cobalt

Product Description

The HERTEL 74146937 is a taper length cobalt drill bit ground with a 135-degree split point and coated in TiAlN for extended tool life in demanding applications. The bit measures 0.1990 inches in diameter, corresponding to wire gauge size 8, with a 3.625-inch flute length and a 6-inch overall length. The spiral flute geometry and web-thinned, tapered web configuration reduce thrust and improve chip evacuation. The straight cylindrical shank seats securely in standard drill chucks. Licensed machinists, maintenance mechanics, and tool-room technicians install and use this bit in production and field environments where heat and wear resistance are critical.

This bit is designed for drilling alloy steel and stainless steel, materials that generate high cutting temperatures and require a substrate and coating that maintain hardness under heat. The TiAlN coating provides thermal resistance well beyond standard HSS or uncoated cobalt bits, making it suitable for dry or minimal-lubrication drilling conditions. Right-hand cut with a regular spiral type, it is appropriate for standard drill press, CNC, or hand-held drill motor use in metal fabrication, maintenance, and manufacturing settings.

Key Features

• Wire gauge size 8, 0.1990-inch diameter for precise sizing in metal drilling applications
• 135-degree split point reduces walking and lowers thrust on entry
• Cobalt substrate retains hardness at elevated cutting temperatures
• TiAlN coating extends tool life in alloy steel and stainless steel
• Web-thinned tapered web reduces cutting resistance and improves chip flow
• 3.625-inch flute length and 6-inch overall length provide reach beyond standard jobber geometry
• Straight cylindrical shank compatible with standard drill chucks and collets

Compatibility

Designed for use in alloy steel and stainless steel applications. Fits standard drill chucks and collet systems accepting straight cylindrical shanks at 0.1990-inch diameter. No coolant-through capability; suited for external coolant or dry cutting setups.

Installation Notes

Secure the straight shank in a properly rated drill chuck or collet before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. When drilling stainless or alloy steel, use appropriate cutting fluid or mist coolant unless operating in a confirmed dry-cut application matched to the TiAlN coating. Inspect the cutting edge before each use and remove from service if chipping or wear is observed at the point.