Hertel 74132069 Screw Machine Drill Bit Size 8 Cobalt

Product Description

The HERTEL 74132069 is a screw machine length drill bit designed for high-performance drilling in ferrous and hard materials. Built from cobalt steel and coated with TiAlN (titanium aluminum nitride), this bit handles elevated cutting temperatures and extends tool life in demanding production environments. The 135-degree split point reduces walking and decreases the thrust required to start a hole, eliminating the need for a center punch in most applications. At 2.25 inches overall length, the stub-length body provides added rigidity compared to jobber-length bits, reducing deflection in short-reach drilling tasks. Licensed machinists, tool-and-die workers, and maintenance technicians typically select this bit for metal fabrication, repair, and precision drilling work.

This bit is suited for drilling mild steel, stainless steel, cast iron, high-temperature alloys, and other hard materials where standard high-speed steel bits wear prematurely. The screw machine (stub) length format is a standard choice for drill press work, CNC turret lathes, screw machines, and manual machining operations where a shorter, stiffer bit improves hole accuracy. The wire gauge Size 8 designation corresponds to a decimal diameter of 0.1990 inches, placing it in common use for tapping preparation, clearance holes, and close-tolerance through-holes in metal workpieces.

Key Features

• Cobalt steel construction resists heat and wear when drilling hard and abrasive metals
• TiAlN coating provides additional heat resistance and extends cutting edge life at high spindle speeds
• 135-degree split point reduces thrust and minimizes walking without center punching
• Web-thinned parallel web configuration lowers cutting resistance and improves chip evacuation
• Straight-cylindrical shank fits standard drill chucks without special toolholders
• Screw machine (stub) length body increases rigidity and reduces deflection versus jobber-length bits

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit compatible with standard drill chucks and toolholders accepting a straight-cylindrical shank in the wire gauge size range of 0.1500 to 0.2000 inches decimal diameter.

Installation Notes

Installation of this drill bit is performed by machinists, tool-and-die technicians, or qualified maintenance personnel. Secure the straight shank fully into the chuck and verify runout before drilling. Always power down and de-energize the spindle before changing bits. Follow facility lockout/tagout procedures and applicable OSHA machine guarding requirements when operating drilling equipment.