Stone Manganese Marine has been designing and supplying marine propellers since the screw propeller was first developed in the 19th Century. Over the years many of the worlds most famous merchant and naval ships have relied on Stone Manganese Marine propulsion technology.

Today, at the headquarters at Birkenhead in the UK, the company has facilities to design and supply propellers with finished weights in excess of 100 tonnes, supported by specialist expertise in design, propeller metallurgy and manufacturing technology. The company’s own Meridian design technology continues to be developed to provide efficient solutions to the most demanding worldwide applications. Whilst manufacture in the well-proven proprietary nickel and manganese aluminium bronze alloys, NIKALUM, SUPERSTON and SONOSTON ensure reliable long-term service.