... STO,RSTO,NATR,NATV,NUTR CRY,RNA22..2RS,NA22..2RS Material:20GrMo ,GCr15 Metric and inch sizes ... type track rollers without inner ring NA22 - 2RS :Double face sealed, yoke type track rollers with ... must be precisely machined at least.RNA22...2RS,NA22...2RS type yoke type track rollersThe diameter of ... 05mm,the width tolerance of NATR,NATV,NUTR bearings is h12.Center adjustabilityThe yoke type track roller ...