U22/T22(8 * 22.4 * 13.5 * 14.4) guideway roller bearingInner diameter -DRB-d)8mmOuter diameter (d)22.4 mmWidth (b)13.5 mmWidth (c)14.4 mmGroove diameter dw 12mmU-groove t-grooveGroove chamfer (min)(rs)0.3Material GCR15 bearing steel