Application: STF-series spherical rod ends may be assembled to a rod, pipe, tube or cable connecting linkage to allow misalignment between two moving points.Ball: 440C stainless steel, surface hardened for wear resistance.Configuration: housing styles are subject to change based on manufacturing considerations.Housing: 300-series stainless steel.Mounting Stud: an optional feature specified by adding an "S" after the nominal size (i.e., STF-6S).Race: the STF-series features a teflon bearing race.