Hertel 66691932 Cobalt Screw Machine Drill Bit Size 17

Product Description

The HERTEL 66691932 is a cobalt screw machine length drill bit designed for high-speed, high-heat drilling applications in metal fabrication, machining, and maintenance repair. Sized at wire gauge number 17 with a decimal diameter of 0.1730 inches, this bit features a 135-degree split point that starts on contact without center-punching and reduces walking on hard or curved surfaces. The titanium nitride (TiN) coating extends surface hardness and tool life in abrasive materials. At 2-3/16 inches overall length, the stub-length body provides added rigidity for precision hole-making in tight clearances. A parallel web-thinned design reduces thrust load during entry.

This bit is suited for drilling ferrous metals, stainless steel, cast iron, and other hard materials where standard high-speed steel bits wear prematurely. Screw machine length geometry makes it a practical choice for drill press, CNC, and turret lathe operations where a shorter, stiffer cutting tool is preferred. It is used in production shop environments, field maintenance, and tool-and-die applications where consistent hole quality at small diameters is required. Right-hand cutting rotation is standard for use with conventional drill motors and machines.

Key Features

• Wire gauge size 17, 0.1730-inch diameter for precise small-bore drilling
• Cobalt construction for heat resistance in hard and abrasive metals
• TiN coating adds surface hardness and reduces friction for extended tool life
• 135-degree split point reduces walking and lowers required thrust force
• Stub screw machine length at 2-3/16 inches OAL provides rigidity in tight setups
• Web-thinned parallel web reduces entry load on hard materials

Compatibility

Designed as a screw machine length replacement drill bit for operations requiring wire gauge number 17 (0.1730-inch) diameter holes, compatible with standard straight-cylindrical shank drill chucks on drill presses, CNC machining centers, and hand-held drill motors.

Installation Notes

Installation of this bit is performed by machinists, toolroom technicians, and maintenance professionals. Secure the straight-cylindrical shank fully in the chuck and verify concentricity before drilling. Ensure the spindle direction is set to right-hand rotation before engaging the workpiece. Use appropriate cutting fluid for the material being drilled to maximize coating life and hole quality.