PROMET 7, gun metal
PROMET 737, gun metal EN 1982-CuSn7Zn4Pb7-C-GC/GZ, Rg7
PROMET 737 is a connecting factor between gun metals and leaded tin bronzes. It endures bigger surface pressure than PROMET 5, in addition, the sliding properties of 737 are better. Its properties are near the properties of leaded tin bronzes.
In sliding bearings of earth moving machinery and in sliding bearings, which are slightly more loaded than PROMET 5.