Pferd 21722734 Carbide Bur SC-3L6 Ball Nose 3/8 in

Product Description

The PFERD 21722734 is a solid carbide abrasive bur in the SC-3L6 ball nose cylinder profile, designed for aggressive material removal on hard ferrous metals. It carries a TOUGH Cut tooth style, which uses a coarser, cross-cut pattern suited for rapid stock removal rather than fine finishing. The cutting diameter is 0.375 inches, the length of cut is 0.75 inches, and the overall length is 6.625 inches, placing it in the long-reach category. The 0.25-inch shank fits standard die grinders and rotary tools used in fabrication, maintenance, and toolroom work. The uncoated carbide head handles interrupted cuts and hard-surface applications without chipping under normal operating loads.

This bur is intended for use on ferrous materials that demand a robust cutting geometry. Typical applications include port and cavity work in cast iron components, weld blending on cast steel assemblies, deburring of hardened or heat-treated steel parts, and contour grinding in areas where a ball nose profile is required to reach curved or radiused surfaces. The TOUGH Cut geometry is particularly effective where softer tooth styles load up or chatter on dense material.

Key Features

• SC-3L6 ball nose cylinder profile for curved surface access and contour work
• TOUGH Cut tooth style optimized for rapid stock removal on hard ferrous metals
• Solid carbide head, uncoated, rated for hardened and heat-treated steels over 370 HV (38 HRC)
• Long-reach geometry at 6.625 inches overall length for deep-cavity applications
• Maximum operating speed of 29,000 RPM for use with standard pneumatic die grinders
• 1/4-inch shank diameter fits the most common die grinder collet size

Compatibility

Suited for use on annealed cast iron, black annealed cast iron (GTS, GJMB), case-hardened steels, cast iron, cast steel, grey and nodular cast iron (GG/GJL, GGG/GJS), hardened and heat-treated steels over 370 HV (38 HRC), steel, and cast steel materials with elevated hardness. Fits any die grinder or rotary tool accepting a 1/4-inch collet.

Installation Notes

Installation is performed by metalworkers, machinists, and maintenance technicians using a die grinder or rotary tool with a 1/4-inch collet. Before mounting the bur, ensure the tool is disconnected from the air supply or power source and the collet is clean and undamaged. Do not exceed the rated maximum of 29,000 RPM, and always inspect the bur for cracks or missing teeth before each use. Eye protection and appropriate PPE are required when operating rotary carbide burs on hard metals.