Hertel 74129347 Die Drill Bit 27/64 in Solid Carbide

Product Description

The HERTEL 74129347 is a straight-flute die drill bit engineered for precision drilling in hard and demanding workpiece materials. Built from C2-grade solid carbide with a bright finish, this bit delivers the rigidity and edge retention required when working with stainless steel, titanium alloy, nickel alloy, and heat-treated alloy steels. The 27/64 inch (0.4219 inch decimal) diameter features a 140-degree notched point and web-thinned geometry to reduce entry force and improve centering accuracy. Cutting direction is right hand. Licensed tool and die makers, machinists, and maintenance technicians are the primary installers of this type of bit.

This drill bit is suited for die work, precision hole-making, and production drilling in shop and manufacturing environments where tight tolerances are required. The diameter tolerance of +0.0000 to -0.0005 inches makes it appropriate for close-tolerance bores in mold and die components, aerospace hardware, and industrial fabrication. It is sold as a single unit and is compatible with standard drill chucks and collet holders accepting a 27/64 inch shank.

Key Features

• C2-grade solid carbide construction for hardness and wear resistance in tough alloys
• 140-degree notched point for reduced thrust and improved self-centering
• Web-thinned geometry lowers cutting resistance at entry
• Straight-flute design optimized for die drilling applications
• Diameter tolerance of +0.0000 to -0.0005 inches for close-tolerance work
• Bright finish with 2-flute right-hand cutting configuration

Compatibility

Rated for primary and secondary workpiece materials including chrome alloy, heat-treated alloy, nickel alloy, stainless steel, carbon steel, and titanium alloy. Fits standard drill chucks and collet systems accepting a 0.4219 inch shank diameter.

Installation Notes

Installation and use should be performed by qualified machinists or tool and die professionals familiar with carbide tooling. Secure the bit firmly in a compatible chuck or collet before operation and verify runout is within acceptable limits, as carbide is brittle and sensitive to lateral loading. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life and maintain surface finish. Do not use this bit in hammer or impact-mode drilling.