Hertel C.E08.1067 Extra Length Drill Bit 0.4200 in Hss

Product Description

The HERTEL C.E08.1067 is an extra length twist drill bit designed for drilling through metal, wood, and other materials where standard-length bits cannot reach. Built from high-speed steel (HSS) with an oxide finish, it measures 0.4200 inches in diameter with an overall length of 8.0000 inches and a flute length of 5.5 inches. The 118-degree point angle is the standard general-purpose geometry, making it suitable for a broad range of materials without requiring specialized grinding. Machinists, tool and die workers, and maintenance technicians use extra length bits when accessing deep bores or drilling through thick stock that exceeds the reach of jobber-length tooling.

This bit is suited for general-purpose drilling operations in metal fabrication, maintenance and repair, HVAC equipment assembly, and light manufacturing environments. The extended overall length of 8.0000 inches allows access to recessed locations or through-hole applications in thick plate, tubing, and structural sections. It is a single-piece bit intended for use in drill presses, hand drills, and milling machine spindles capable of accepting a 0.4200-inch shank.

Key Features

• 0.4200-inch diameter with 118-degree general-purpose point angle
• 8.0000-inch overall length for extended reach applications
• 5.5-inch flute length for effective chip evacuation in deep holes
• 2-flute geometry standard for twist drill applications
• High-speed steel construction for durability across a range of materials
• Oxide finish provides mild lubricity and corrosion resistance during storage and use

Compatibility

Designed as a general-purpose extra length drill bit compatible with any drill press, hand drill, or milling spindle that accepts a 0.4200-inch straight shank.

Installation Notes

Secure the bit firmly in the chuck and verify runout before beginning drilling operations. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and improve hole finish. Reduce feed pressure when the bit begins to break through the far side of the material to prevent grabbing or bit breakage. Inspect the cutting edges before each use and redress or replace the bit if chipping or dulling is evident.