Series 40 High Load Exit Box for Single Rope or Wire. Plain bearing sheaves are ideal for halyards and other applications where high static loads are likely to be encountered. Applications:. Ideal applications where lines (rope or wire) need to be led through decks, bulkheads or spars minimizing friction and chafing. Materials:. Nylatron & regl sheave. Grade 316 Stainless Steel cheeks. Specifications:. Sheave Ø: 40.0mm(1-9/16"). Max. Rope Ø:10.0mm(3/8"). Max. Cable Ø: 5.0mm(3/16"). B.L.: 1,000kg(2,200lbs)