SPA Pulleys from HMA Flow & Industrial are made from GG-25 cast iron. Each pulley undergoes stringent balancing tests to ensure efficient individual functioning. The SPA Pulleys from HMA Flow & Industrial are finished in a black coating that acts a s a primer for protection from environmental factors. The taper bored stock pulley range from HMA Flow & Industrial covers SPZ, SPA, SPB and SPC. Circumferential speeds of up to 40 m/s are permissible.