1. Product Overview MBWTD18 is a wide-width self-lubricating spherical plain bearing derived from MBWT series, full model code breakdown: MBWT: Wide-body spherical plain bearing with integrated ball head structure, built-in PTFE self-lubricating liner D: Double lip dustproof sealing structure on both sides 18: 18mm inner bore matching dimension Fully interchangeable with NMB original MBWTD18, widely applied to automotive control linkages, hydraulic cylinder swing joints,