... delivery 4.High speed, low voice spherical roller bearing SKF 22315 Spherical roller bearing (aligning roller bearing)BrandSKF, NTN, FAG, NSK, NACHI ... row symmetrical roller, inner ring rideMA: Machined brass cage, outer ring rideMB: Machined brass cage, inner ring ride K ... annular groove and lubrication holes in outer ringW20: Three lubrication holes in outer ringW26: Six lubrication holes in inner ...