SMF84ZZ Stainless Steel Flanged Ball Bearing 4mm/8m/3mm (shielded or sealed) Structure: Deep Groove Type: Ball Brand Name: NSK, NTN, SKF, HTZC  Available in SAE52100 chrome steel and AISI440C or KS440 (ACD34/X65Cr13) stainless steel, these metric sized deep groove radial flanged miniature bearings can withstand heavy radial loads and moderate thrust loads in both directions. Flanged miniature bearings have an outer ring flange to facilitate location in a housing.