Hertel H-81197040000 Spotting Drill 4mm 90 Cobalt M-35

Product Description

The HERTEL H-81197040000 is a spotting drill designed to create precise starting points for twist drills and other cutting tools in metal fabrication and machining operations. Built from Cobalt M-35 (HSS-E), the tool offers improved heat resistance and wear performance compared to standard high-speed steel. The 90-degree point angle promotes accurate hole location with minimal walking, while the bright, uncoated finish is well-suited to a wide range of general-purpose applications. At 4 inches overall length with a 4 mm cutting diameter and a 0.475-inch flute length, this single-ended spotting drill is a compact, reliable choice for production and maintenance machinists alike.

This spotting drill is used in general-purpose metal drilling applications where accurate hole positioning is critical before finish drilling, reaming, or tapping. The straight-cylindrical shank allows straightforward chucking in standard drill chucks or collet holders on machining centers, drill presses, and CNC lathes. Its 4 mm diameter makes it appropriate for smaller hole work in steel, stainless, cast iron, and similar materials. Machinists and tool-and-die technicians working in job shops, manufacturing facilities, and maintenance environments will find it suitable for both production runs and one-off setups.

Key Features

• Cobalt M-35 (HSS-E) construction provides elevated heat and wear resistance for demanding materials
• 90-degree point angle delivers accurate hole location and reduces drill wander on curved or angled surfaces
• Web-thinned geometry reduces thrust and improves chip evacuation at the point
• Bright, uncoated finish compatible with most cutting fluids and coolant systems
• Right-hand cut with 2-flute spiral design for standard CNC and manual machine setups
• Straight-cylindrical shank for direct chucking in standard holders without adapters

Compatibility

Designed as a general-purpose spotting drill for use in standard drill chucks and collet systems accepting a 4 mm straight-cylindrical shank on drill presses, machining centers, and CNC turning centers.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Ensure the machine spindle is fully stopped and locked out before mounting or removing the tool from the chuck or collet holder. Confirm shank seating depth and runout before beginning a cut. Use appropriate cutting fluid for the workpiece material to protect tool life and maintain surface finish.