According to my experience, these bearings did not perform well in an industrial and scientific setting. Despite being shielded, they allowed dirt and debris to build up and caused unnecessary friction .On the plus side they were easy to install. However, the cons outweigh the pros and I would not recommend these bearings..
Enhanced Performance Sydien SCS12UU Bearing Bushing Diameter for Precision Machinery
4 Review
FKG 99502HNR Bearing Width Pre Lubricated
5 Review
Linear Clamping Support Bearing by Sydien
4 Review
π Wheels Manufacturing Ball Retainer Bag: Convenient Storage and Protection for Your Ball Retainers
6 Review