Hertel 79891834 Solid Carbide Jobber Drill Bit No. 51

Product Description

The HERTEL 79891834 is a solid carbide jobber-length drill bit in wire gauge size No. 51, with a decimal diameter of 0.0670 inches. Built from C2-grade solid carbide with a bright finish, it features a standard 118-degree split point and a web-thinned, tapered web for improved centering and reduced thrust on entry. The spiral flute geometry is a regular right-hand configuration with two flutes. Overall length is 1.5 inches, with a flute length of 0.75 inches. The straight-cylindrical shank matches the 0.0670-inch drill diameter. This bit is rated as a high-performance grade tool suited to precision drilling applications in tight-tolerance work.

Wire gauge drill bits in the No. 51 range are commonly used in metalworking, electronics fabrication, toolmaking, and light manufacturing where precise small-diameter holes are required. The solid carbide construction makes this bit appropriate for drilling hardened steels, cast iron, nonferrous alloys, and composites where high-speed steel tooling wears too quickly. It is typically run in CNC machining centers, drill presses, or high-speed hand-held spindles. The diameter tolerance of -0.0005 to 0.0000 inches ensures hole consistency within close-tolerance specifications.

Key Features

• Solid carbide construction, C2 material grade, for extended tool life in hard and abrasive materials
• No. 51 wire size, 0.0670-inch decimal diameter with tolerance of -0.0005 to 0.0000 inches
• 118-degree standard point angle with web-thinned, tapered web for accurate starting and reduced thrust
• Regular spiral, two-flute right-hand cutting geometry for efficient chip evacuation
• Bright finish, no coating, suitable for general-purpose and non-ferrous applications
• Compact 1.5-inch overall length with 0.75-inch flute length for short-reach precision work

Compatibility

Designed as a jobber-length solid carbide drill bit for use in standard straight-shank drill chucks and collets accepting a 0.0670-inch shank diameter across CNC machining centers, drill presses, and precision spindle equipment.

Installation Notes

Installation and use of this drill bit should be performed by machinists or trained metalworking professionals familiar with small-diameter carbide tooling. Secure the straight-cylindrical shank firmly in a compatible precision drill chuck or collet before operation; carbide bits are brittle and will fracture under side load or improper runout. Ensure the spindle and workpiece are properly fixtured to minimize vibration, which is a primary cause of small-diameter carbide breakage. Coolant-through capability is not available on this bit, so apply cutting fluid externally when drilling ferrous materials to manage heat.