Hertel 79891842 Solid Carbide Jobber Drill Bit No. 50

Product Description

The HERTEL 79891842 is a solid carbide jobber-length drill bit sized to No. 50 wire gauge, equivalent to 0.0700 inch diameter. Built from C2-grade solid carbide with a bright finish coating, this bit is engineered for high-performance drilling in materials that demand tight tolerances. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve centering. Overall length is 1.75 inches with a 0.875-inch spiral flute length. Right-hand cutting with a regular spiral flute pattern. Machinists and tool-room technicians install this bit in CNC machining centers, drill presses, and precision hand-held spindles where dimensional accuracy is critical.

This bit is suited for production and toolroom applications requiring small-diameter, tight-tolerance holes. The straight-cylindrical shank seats directly into standard collets and drill chucks without adapters. The solid carbide construction provides rigidity and wear resistance in harder workpiece materials including hardened steels, cast iron, and high-temp alloys. The bright coating preserves the ground surface finish without adding dimensional buildup, keeping the shank and flute geometry at nominal. Diameter tolerance is held at -0.0005 to 0.0000 inch, making it appropriate for close-fit hole applications in precision assemblies.

Key Features

• Solid carbide C2-grade construction for rigidity and wear resistance in hard materials
• No. 50 wire size, 0.0700-inch diameter with tolerance held to -0.0005 to 0.0000 inch
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and better centering
• Bright finish coating preserves ground geometry without dimensional interference
• Regular spiral flute, right-hand cut, 2 flutes for efficient chip evacuation in small-diameter bores
• Straight-cylindrical shank fits standard collets and drill chucks directly

Compatibility

Designed as an OEM-style replacement or direct-use jobber drill bit for any application requiring a No. 50 wire-gauge, 0.0700-inch diameter straight-shank drill in a standard collet or drill chuck.

Installation Notes

Installation and use should be performed by a qualified machinist or tool-room technician familiar with small-diameter carbide tooling. Secure the straight shank fully in the collet or chuck to the recommended engagement depth before operation to prevent runout and bit breakage. Carbide tooling is brittle and should not be subjected to side loads or used in flex-shaft or hammer-drill configurations. Inspect the cutting edges and point geometry before each use and remove from service at the first sign of chipping or wear.