... designed to be dimensionally interchangeable with standard domestic inch series bearings. They incorporate 52100 steel and ABEC 1 tolerances, allowing them ... / closure: open ball bearing, Z, ZZ, RS, 2RS, 2RZ Ball bearings snap ring: N, NR Tolerance: ABEC-1, ABEC-3, ABEC ... external snap ring NR Samples are free. Deep Groove Ball Bearings 1600, 16000 series