Norton 69957308029 Carbide Rotary Bur Ball Nose Cone 3/8 in

Product Description

The NORTON 69957308029 is a double-cut tungsten carbide rotary bur with a ball nose cone head profile, designed for aggressive material removal and contouring in tight or curved workspaces. With a 3/8-inch cutting diameter and a 1-3/16-inch length of cut, this bur handles a wide range of ferrous and non-ferrous metals at up to 25,000 RPM. The 1/4-inch shank fits standard die grinder and rotary tool chucks used daily in fabrication, HVAC ductwork, plumbing rough-in, and electrical enclosure work. Machinists, pipefitters, and sheet metal workers rely on double-cut geometry for faster stock removal with moderate surface finish.

This bur suits applications involving 300 and 400 series stainless steel, cast iron, copper, hard and soft carbon steel, titanium, and tool steel. It is well suited for deburring drilled or punched holes, porting and blending weld joints, shaping curved surfaces, and cleaning up casting flash. The ball nose cone shape is particularly effective for profiling concave contours and working into recessed areas where flat or cylindrical bur profiles cannot reach. Typical use environments include metal fabrication shops, mechanical rooms, and field service work.

Key Features

• Double-cut tooth style for faster metal removal and reduced loading compared to single-cut geometry
• Tungsten carbide head construction provides hardness and heat resistance across demanding materials
• Ball nose cone profile designed for contouring concave surfaces and blending curved geometry
• 3/8-inch cutting diameter with 1-3/16-inch cut length suits medium-scale deburring and shaping tasks
• 1/4-inch shank diameter fits standard die grinders and rotary tools
• Rated to 25,000 RPM maximum for use with high-speed pneumatic and electric rotary tools
• Uncoated head — compatible with a broad range of material types without coating interaction concerns

Compatibility

Designed for use with ferrous and non-ferrous metals including 300 series stainless, 400 series stainless, cast iron, copper, hard carbon steel, soft carbon steel, titanium, and tool steel. Fits any die grinder or rotary tool accepting a 1/4-inch shank. Industry specification SL-3.

Installation Notes

Installation and use of rotary burs should be performed by qualified machinists, fabricators, or trade professionals familiar with rotary tool operation. Verify the tool is fully powered down and the collet is released before inserting or removing the bur. Always confirm the tool RPM rating meets or exceeds the bur maximum of 25,000 RPM before operation, and use appropriate eye protection and gloves when working with carbide burs on metal stock. Secure the workpiece to prevent movement during material removal.