Hertel 66694399 Jobber Drill Bit Wire Size 40 Hss Tin

Product Description

The HERTEL 66694399 is a wire gauge size 40 jobber-length drill bit designed for precision holemaking in metal and industrial materials. Built from high speed steel with a titanium nitride (TiN) coating, this bit delivers extended tool life and reduced friction during cutting. The 135-degree split point promotes self-centering on contact, reducing the need for a center punch and minimizing walking on hard surfaces. At 2.375 inches overall length with a 1.375-inch flute length, it fits standard drill chucks and is suited for production environments and general trade use. A web-thinned, tapered web configuration reduces thrust and improves chip evacuation.

This jobber drill is intended for holemaking applications in metal fabrication, maintenance and repair operations, and general industrial work. The straight-cylindrical shank with a 0.098-inch diameter seats directly in standard keyless or keyed drill chucks. Its regular spiral, two-flute design handles a range of materials including mild steel, aluminum, and plastics. Machinists, tool-and-die technicians, and maintenance professionals working in light to heavy-duty production settings will find this bit appropriate for repetitive drilling tasks where dimensional accuracy and consistent hole quality are required.

Key Features

• Wire size 40 (0.0980 inch decimal equivalent) for precision close-tolerance hole sizing
• 135-degree split point for self-centering entry and reduced thrust
• TiN coating increases surface hardness and extends cutting edge life
• Web-thinned tapered web reduces drill pressure and improves chip flow
• Heavy-duty grade high speed steel construction for demanding production use
• Right-hand cutting, regular spiral, two-flute configuration for general holemaking

Compatibility

Designed as a jobber-length drill bit for use in standard drill chucks accepting straight-cylindrical shanks in the 0.0500 to 0.1000 inch diameter range, conforming to NAS specification designation.

Installation Notes

Install in a keyed or keyless drill chuck and verify the shank is fully seated and secured before operation. Always wear appropriate eye protection and secure the workpiece before drilling. Match spindle speed to material type per standard machining references - excessive speed on hard materials will shorten tool life. Inspect the cutting edges for wear or chipping before each use and replace the bit when hole quality degrades.