Hertel 66692054 Screw Machine Drill Bit Size 29 Cobalt

Product Description

The HERTEL 66692054 is a screw machine length drill bit designed for high-speed, close-tolerance drilling in metal fabrication, machining, and general industrial applications. Built from cobalt high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life in hard and abrasive materials where standard HSS bits wear quickly. The 135-degree split point reduces walking and lowers entry force, enabling accurate starts without a center punch. At 1-15/16 inches overall length, the stub-length body provides added rigidity and reduces deflection in short-reach drilling setups. Machinists, tool-and-die technicians, and industrial maintenance crews are the primary installers of this type of bit.

This bit is sized at wire gauge number 29, with a decimal equivalent of 0.1360 inches. It suits screw machine operations, drill press work, and CNC applications calling for stub-length tooling in the 0.1000 to 0.1500 inch range. The straight-cylindrical shank seats directly in standard drill chucks and collet holders. Right-hand spiral flutes evacuate chips efficiently during through-hole and blind-hole drilling. Its heavy-duty grade makes it appropriate for stainless steel, alloy steel, cast iron, and other difficult-to-machine materials where a standard jobber-length bit would flex or fail prematurely.

Key Features

• Cobalt construction with TiN coating for extended tool life in hard and abrasive materials
• 135-degree split point reduces entry force and resists walking on curved or uneven surfaces
• Stub screw machine length (1-15/16 inches OAL) provides rigidity and reduces deflection
• Web-thinned, parallel-web design lowers cutting resistance and improves chip clearance
• Straight-cylindrical shank fits standard chucks and collet holders without adapters
• Right-hand spiral flutes for conventional chip evacuation in drill press and CNC setups

Compatibility

Designed for use in any drill press, screw machine, or CNC spindle accepting a straight-cylindrical shank drill bit with a 0.1360-inch shank diameter. Suitable for applications requiring tooling within the 0.1000 to 0.1500 inch decimal inch size range.

Installation Notes

A licensed machinist or qualified industrial technician should install and operate this tooling. Secure the shank fully in the chuck or collet before applying power, and verify runout is within acceptable tolerance for the application. Use cutting fluid appropriate for the workpiece material to maximize coating life and chip evacuation. Inspect the cutting edge for wear before each use and replace the bit if chipping or coating breakdown is observed.