Hertel H-81197120000 Cobalt Spotting Drill 0.4724 in

Product Description

The HERTEL H-81197120000 is a cobalt M-35 (HSS-E) spotting drill designed to accurately locate and start holes for subsequent drilling operations. Built with a 90-degree point angle and a 0.4724-inch cutting diameter, this single-ended tool delivers consistent center marks and shallow conical seats in a wide range of metalworking applications. The straight-cylindrical shank measures 0.4724 inches in diameter, allowing direct clamping in standard drill chucks or collet holders. At 6.75 inches overall length with a 1.1875-inch spiral flute, it is suited to CNC machining centers and manual drill presses where rigidity and repeatability are required.

This spotting drill is intended for general-purpose metalworking in job shop, manufacturing, and maintenance environments. The bright uncoated finish makes it well suited to aluminum, mild steel, and similar materials where a plain high-speed steel surface is preferred. Right-hand cutting direction and web-thinned geometry reduce thrust at entry and improve centering accuracy before a twist drill follows. Machinists and CNC operators typically deploy this tool as the first operation in a multi-step hole-making sequence.

Key Features

• Cobalt M-35 (HSS-E) construction provides elevated heat resistance compared to standard high-speed steel
• 90-degree drill point angle creates a standard spotting cone compatible with most twist drill point geometries
• Web-thinned design reduces axial cutting force and improves self-centering at drill entry
• Bright uncoated finish suits dry or light-coolant cutting in aluminum and mild steel
• Straight-cylindrical shank at 0.4724 inches diameter fits standard ER and drill-chuck tooling
• Two-flute spiral configuration promotes chip clearance during short spotting passes

Compatibility

Designed as a general-purpose spotting drill for use in CNC machining centers, knee mills, and drill presses equipped with standard straight-shank toolholders or drill chucks accepting a 0.4724-inch shank diameter.

Installation Notes

Installation and operation should be performed by a qualified machinist familiar with rotating cutting tools. Ensure the spindle is fully stopped and the machine is powered down or in a safe locked-out state before mounting or removing the tool. Clamp the straight-cylindrical shank to the full recommended grip depth in the toolholder to minimize runout and tool pullout risk. Do not use this spotting drill as a substitute for a center drill in applications requiring a 60-degree seat angle, as the 90-degree geometry is not interchangeable for that purpose.