Cylindrical Rollers are used in automotive transmissions, universal joints, front wheeldrive, constant velocity joints water pump bearings, roller clutches, rollerized cam lifters, rocker arms, cam rollers, starter drives and as pins and dowels for various applications. Specifications: 1) Materials standard: AISI 52100 or SAE 52100 bearing quality chrome steel 2) Hardness standard: HRC 58 to 64 3) Surface finish standard: OD ground and lapped to surface finish of 0.020um Ra max. 4) Alternative: surface finish of 0.025um Ra max. is available on request 5) Tolerance: a) Outside diameter (mm): standard +0.000 to - 0.005 [G5] b) Length (mm): standard +0.000 to - 0.500 6) Applications: Needle rollers are available special end forms provide performance benefits for specific kinds of applications as shown below a) I-type BR (rounded ends) b) II-type BP (flat underground ends) c) III-type BPM (flat ground ends)