Hertel 79892097 Solid Carbide Jobber Drill Bit No. 31

Product Description

The HERTEL 79892097 is a solid carbide jobber-length drill bit in wire gauge size No. 31, with a decimal diameter of 0.1200 inches. It features a standard 118-degree split point with web thinning and a tapered web configuration for improved penetration and reduced thrust. The bright coating preserves the carbide substrate without adding dimensional buildup. At 2.2500 inches overall length with a 1.2500-inch spiral flute, this bit is suited for precision drilling in ferrous and non-ferrous metals, composites, and hard plastics. It is installed by machinists, tool-and-die technicians, and maintenance trades requiring tight-tolerance hole making.

This bit is designed for use in CNC machining centers, drill presses, and hand-held power tools with a straight-cylindrical chuck. The 0.1200-inch shank diameter matches the 0.1200-inch cutting diameter, making it compatible with standard collets and drill chucks sized for that range. It is a high-performance grade C2 carbide bit suited for production and job-shop environments where consistent hole geometry and drill life are required. Right-hand cutting direction is standard for conventional clockwise spindle rotation.

Key Features

• Solid carbide construction, grade C2, for extended tool life in hard and abrasive materials
• No. 31 wire size, 0.1200-inch cutting diameter with a tight tolerance of -0.0005 to 0.0000 inches
• 118-degree standard point angle with web thinning and tapered web for reduced entry force
• Bright finish — no coating thickness to affect hole diameter
• 2-flute regular spiral design promotes chip evacuation in through-hole and blind-hole applications
• Straight-cylindrical shank fits standard drill chucks and collets

Compatibility

Designed as a standard jobber-length drill bit for use in any drill press, CNC machining center, or hand-held power tool accepting a straight-cylindrical shank in the 0.1200-inch diameter range.

Installation Notes

Installation is performed by machinists or maintenance technicians. Secure the shank fully in the drill chuck or collet before operation and verify runout before drilling tight-tolerance holes. Power down and de-energize the machine spindle before changing bits. Solid carbide bits are brittle — avoid side-loading or using in flex-shaft tools where lateral deflection can cause breakage.