Features: 1) SYZ radial spherical plain bearings requiring maintenance (steel-on-steel) have hardened sliding contact surface on both rings 2) The surfaces are treated with molybdenum disulphide and phosphated 3) Wear-resistant and anti-corrosion 4) Bearings with this sliding contact surface combination require regular re-lubrication 5) The high strength of sliding contact surfaces makes these bearings especially suitable for bearing arrangements, where heavy loads of alternating direction, shock loads or heavy static loads have to be accommodated Radial spherical plain bearings requiring maintenance: 1) Steel / steel 2) GE-E, GE-ES, GE-ES-2RS 3) GEG-E, GEG-ES, GEG-ES-2RS 4) GEEW-ES 5) GEEM-ES-2RS 6) GEF-ES 7) GE-XS/K 8) GEZ-ES, GEZ-ES-2RS 9) GEWZ-ES, GEWZ-ES-2RS 10) GEGZ-ES, GEGZ-ES-2RS 11) GEC-XS, GEC-XS-2RS 12) GEK-XS-2RS 13) GEBJ-S 14) GEFZ-S 15) Steel / bronze 16) GEBK-S