Hertel 66691908 Cobalt Screw Machine Drill Bit Wire 14

Product Description

The HERTEL 66691908 is a cobalt screw machine length drill bit designed for heavy-duty drilling in tough materials. It carries a wire size designation of 14, corresponding to a decimal diameter of 0.1820 inches, and features a 135-degree split point with web thinning for fast penetration and reduced thrust. The TiN (titanium nitride) coating extends cutting edge life and reduces friction during operation. At 2-3/16 inches overall length, this stub-style bit fits standard drill chucks and is well suited for close-quarters or production drilling work. Licensed machinists, tool and die technicians, and maintenance professionals are the typical end users.

Screw machine length drill bits are the go-to choice in production machining, sheet metal fabrication, and maintenance environments where shorter overall length improves rigidity and reduces deflection. The 66691908 is built for right-hand cut operation in ferrous metals, stainless steel, cast iron, and other hard alloys where standard high-speed steel bits underperform. The straight-cylindrical shank seats directly in keyed or keyless drill chucks on benchtop drill presses, hand drills, and CNC machining centers alike.

Key Features

• Cobalt tool material provides superior heat resistance for drilling hard and abrasive metals
• TiN coating reduces friction and extends cutting edge service life
• 135-degree split point with web thinning for self-centering entry and lower thrust requirements
• Screw machine (stub) length improves rigidity and reduces bit deflection
• Right-hand spiral flutes for standard chuck compatibility and efficient chip evacuation
• Heavy-duty grade construction rated for demanding production and maintenance applications

Compatibility

Designed as a replacement or production-stock screw machine length drill bit for applications requiring a wire size 14 (0.1820 inch) diameter within the 0.1500 to 0.2000 inch decimal inch range. Fits any drill chuck accepting a 0.1820-inch straight-cylindrical shank.

Installation Notes

Install and remove drill bits only when the drill press, hand drill, or CNC spindle is fully powered down and secured. Ensure the straight-cylindrical shank is fully seated and chuck jaws are tightened evenly before beginning a cut. Use cutting fluid or coolant appropriate for the workpiece material when drilling ferrous or stainless alloys to preserve coating life. Follow shop safety procedures and applicable OSHA standards for rotating machinery during all tooling changes.