Hertel 84580711 Jobber Drill Bit Letter X 0.3970 in Hss

Product Description

The HERTEL 84580711 is a high speed steel jobber-length drill bit sized to letter X (0.3970 inches decimal equivalent) with a 135-degree split point and oxide coating. It is designed for heavy-duty holemaking in metal and general-purpose materials. The split point geometry reduces walking at start and lowers thrust requirements compared to a conventional point. The oxide finish provides a basic layer of surface protection during cutting. This drill is installed and used by machinists, maintenance technicians, pipefitters, and other trade professionals working with standard drill presses, hand drills, or CNC equipment.

This jobber drill is suited for production and maintenance drilling applications where a standard-length bit with a straight cylindrical shank is required. The 5.125-inch overall length and 3.75-inch flute length make it appropriate for through-hole and blind-hole work in typical workpiece thicknesses. It is a right-hand cut bit and accepts standard drill chucks sized for a 0.3970-inch shank diameter. Applications include metalworking, mechanical assembly, and field maintenance across industrial, commercial, and trade settings.

Key Features

• Letter X size: 0.3970-inch decimal equivalent for precise hole sizing
• 135-degree split point reduces bit walking and lowers feed pressure required
• High speed steel construction rated for heavy-duty service
• Oxide coating provides surface protection during drilling operations
• Regular spiral, two-flute design promotes chip evacuation in typical drilling conditions
• Web-thinned, tapered web configuration supports cutting efficiency at the tip

Compatibility

Designed as a jobber-series replacement or stock drill bit for use in standard drill chucks and collets accepting a 0.3970-inch straight cylindrical shank, consistent with NAS specification tooling requirements.

Installation Notes

Install in a properly sized drill chuck and tighten securely before operation. Ensure spindle speed is set appropriately for the material being drilled and the bit diameter. Use cutting fluid or coolant as recommended for the base material to extend tool life and improve hole quality. Inspect the cutting edges before each use and replace the bit if the point shows wear or chipping.