Inner Ring, Needle Bearing IR, Metric type LR, Inch type All of the internal rings have been heat treaded and fine machined. If the shaft cannolt be heat treated, it is better to use the internal ring as a sleeve. If the needle bearing and internal ring is used at the same time, the play is a common one and they are interchangeable. Our company also produces the inernal ring with accurate play and produces various internal rings with metric and British systems.IR SERIES SIZE: IR5*8*12~IR130*150*50 LR SERIES SIZE: LR7*10*10.5~LR45*50*25.5
