Miniature Bearings
The dimensional range of miniature and extra small bearings can be found in Table 1. Boundary dimensions for both metric and inch series are in accordance with the internationally specified ISO and ANSI/ABMA standards. The most widely used sealed and shielded type ball bearings generally have a 1 - 2 mm wider width dimension than open type bearings. The main variations of these bearings are shown in Table 2. Miniature and extra small size ball bearings can also utilize snap rings, which simplify assembly within the housing. These bearings with snap rings can also be found in the dimensional tables in this catalogue. Among the most generally used sealed and shielded bearings are standard ZZ and ZZA types which incorporate non-contact steel shield plates. Fig. 1 also shows non-contact type rubber sealed LLB and resin sealed SSA type bearings, as well as the contact-type rubber sealed LLU bearing. Information supplied by NTN.
