Page 131 of Ball and Roller Bearings by NTN Corporation Japan

miniature and extra small bearings open type shielded type open type with snap ring 1 design features and special characteristics the dimensional range of miniature and extra small ball bearings is given in table 1 boundary dimensions for both metric and inch systems are in accordance with the internationally specified iso and ansi/abma standards the most widely used sealed and shielded type ball bearings have a 1­2 mm wider width dimension than open type bearings the main variations of these bearings are shown in table 2 bearings with snap rings which simplify the bearing housing construction and design have also been serialized and are listed in dimension tables among the most generally used sealed and shielded bearings are standard zz and zza type which incorporate non-contact steel shield plates diagram 1 also shows non-contact type rubber sealed llb and resin sealed ssa type bearings and the contact-type rubber sealed llu bearing table 1 dimensional range bearing miniature ball bearings extra small ball bearings dimensional range nominal outer diameter d 9mm nominal bore diameter d 10mm nominal outer diameter d 9mm rubber sealed non-contact type llb rubber sealed contact type llu diagram 1 resin sealed non-contact type ssa table 2 main types and construction standard type code type construction metric system inch system construction flange-attached type code metric system inch system open type 6 bc r fl6 flbc flr shielded type 6 x x zz w 6 x x zz wbc x x x zz ra x x zz fl 6 x x x zz flw 6 x x x zz flwbc x x zz flra x x zz note 1 representative type codes are shown for further details please refer to dimension tables 2 for shielded type bearings there are instances where za may change to sa depending on the bearing number b-29

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