... , C3, C4, C5 1)Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield2)Tolerance codes: ABEC-1, ABEC-3, ABEC ... , C3, C4, C55)Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic6)Retainer: PTFE, Nylon, PEEK Or Stainless Steel Bearing modleBoundary dimensiondDDfBBfFlangeOpenShieldmmmmmmmmmm-R09-0 ... --R1038ZZ0.3759.5250.62515.875- high-quality& high-speed / R series / Miniature bearing