Hertel 74132390 Size 42 Cobalt Screw Machine Drill Bit

Product Description

The HERTEL 74132390 is a screw machine length drill bit engineered for high-performance drilling in tough materials. Built from cobalt steel with a TiAlN coating, it handles hardened steels, stainless, and abrasion-resistant alloys that would wear out standard HSS bits quickly. The 135-degree split point reduces walking and cutting thrust at entry, making it well-suited for production drilling without a center punch. At 1.75 inches overall length, this stub-length geometry provides rigidity in short-reach applications. The right-hand spiral flute with a web-thinned, parallel web configuration promotes efficient chip evacuation and reduces torque requirements on the drill press or CNC spindle.

This bit is designed for screw machine work, drill press operations, and CNC machining centers where short-length rigidity and cutting efficiency are priorities. The 0.0935-inch diameter corresponds to a wire gauge size 42, making it a standard selection for tapping pilot holes, through-holes in thin stock, and precision hole placement in metalworking and fabrication shops. Licensed machinists, tool-and-die technicians, and production shop floor personnel are the primary users. It ships as a single bit with a minimum order quantity of 12 units.

Key Features

• Cobalt steel construction resists heat buildup and wear in ferrous and stainless alloys
• TiAlN coating extends tool life and reduces friction at elevated cutting temperatures
• 135-degree split point for reduced thrust and no-walk entry without a pilot hole
• Web-thinned parallel web lowers cutting torque and improves chip flow
• Screw machine (stub) length at 1.75 inches OAL provides maximum rigidity in tight setups
• Straight-cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as an OEM-style replacement and standard production drill bit for use in drill presses, screw machines, and CNC machining centers accepting a straight-cylindrical shank at 0.0935 inches diameter.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Ensure the spindle is fully stopped and the machine is de-energized before loading or changing the bit. Secure the straight shank firmly in the chuck or collet to the manufacturer-specified grip depth before operation. Use appropriate cutting fluid or coolant compatible with TiAlN coatings to maximize tool life, noting that this bit does not support internal coolant-through delivery.