Industrial 53320B Ball End Mill

AC Drills 53320B Industrial Ball End Mill is a 1/4-inch diameter ball-end milling tool with a 1/4-inch length of cut and three flutes (3FL). The 53320B designation places it in AC Drills’ line of ball-end end mills, designed for precise contouring on curved surfaces. With a spherical tip, this end mill creates smooth radii and rounded transitions in 3D profiles, enabling gentle blends between surfaces and the formation of organic shapes during rapid prototyping and small-batch production. The three-flute geometry offers a balance between material removal rates and finished surface quality, supporting stable cutting action and predictable tool life in suitable materials while providing adequate chip clearance in moderate-depth cuts. Use cases often include curved pockets, contour finishing on molded parts, and relief work where a conventional flat-end tool would leave facets. This tool is marketed as part of AC Drills’ standard end-mill lineup for milling centers and manual mills that accommodate 1/4-inch tooling, making it a practical choice when a compact, precise ball-end solution is needed for small-scale 3D machining tasks.