Hertel 66691437 Screw Machine Drill Bit 13/32 in Cobalt

Product Description

The HERTEL 66691437 is a screw machine length drill bit designed for high-speed, close-tolerance drilling in metal fabrication, maintenance, and production environments. Built from cobalt steel with a titanium nitride (TiN) coating, this bit handles tough ferrous metals, stainless steel, and hard alloys where standard HSS bits lose their edge. The 135-degree split point reduces walking on entry and requires no center punch on most surfaces. At 3-5/16 inches overall length and 13/32 inch diameter, the shorter-than-standard body delivers improved rigidity and reduced deflection in drill press and CNC setups. Installed by machinists, tool-and-die technicians, and maintenance mechanics.

This drill bit is suited for screw machine operations, drill presses, and CNC machining centers where a rigid, short-length bit is preferred over jobber-length tooling. The straight cylindrical shank seats securely in standard chucks and collet holders. Typical applications include production drilling in mild steel, alloy steel, cast iron, and stainless steel. The regular spiral flute with web-thinned, parallel web configuration promotes efficient chip evacuation during through-hole and blind-hole operations in both shop and field maintenance settings.

Key Features

• Cobalt steel construction resists heat buildup during extended drilling in hard metals
• TiN coating extends tool life and reduces friction at the cutting edge
• 135-degree split point starts on contact without center punching
• Screw machine (stub) length body increases rigidity and reduces deflection
• Web-thinned parallel web improves chip clearance and reduces thrust load
• Right-hand cutting, spiral flute for standard drill press and CNC chuck use

Compatibility

Designed for use in standard drill chucks and collet holders accepting a 0.4062-inch straight cylindrical shank, compatible with drill presses, screw machines, and CNC machining centers requiring a 13/32 inch diameter screw machine length drill bit.

Installation Notes

This bit is installed by machinists and maintenance mechanics in drill press or CNC applications. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the straight shank fully and evenly in the chuck or collet before tightening. Use appropriate cutting fluid for the workpiece material to maximize tool life and hole quality; dry cutting cobalt bits in hard alloys accelerates edge wear.