Spherical plain bearings (SBPs) ni hta "htap htuk ai" shingra tara matut mahkai ai shara lahkawng nga ai, dai hpe coordinated contact ngu shamying ai matut mahkai lam langai mi re. SBPs ni a jak rung atsam ni a matu sawn la ai ladat ni gaw shanhte a structural design hte bu hpun palawng ni hpe sawk sagawn na matu ahkyak ai. Coordinated surfaces ni hta matut mahkai ai lam hpe sawn la ai gaw, grai sawng ai manghkang langai rai nga ai. Ya nga ai Hertz model, elastic half{3}}spaces hpe shadawn sharam da ai, n-gun garan ai lam hpe n mai lang ai. Dai zawn re ai n-gun rawng ai lam ni hpe n-gun jaw ai. Ndai model gaw non{6}} contact hte coordinated matut mahkai ai lam lahkawng yan hta jai lang mai ai. Raitim, SBP langai a matut mahkai ai shara gaw hkum tsup ai lam n re ai majaw, shi a matut mahkai n-gun garan ai lam hpe sawn la ai shaloi, hkum tsup ai spherical coordinated contact model hpe madung tawn nna, matut nna sawn la ra ai. Dai hta n-ga, SBP ni hpe galaw ai shaloi, manu jahpu n jaw ra ai lamu ga jarit akyu ni byin wa chye ai, shanhte a application hpe hkra machyi shangun ai. Ndai lawt lu ai lamu ga jarit akyu gaw SBP shinggan ring a jut kaw na contact contact pressure hte n-gun kaba ai n-gun hpe shabyin ya ai.