Pillow block ball bearings UCP318 (UCP, HCP, UCLP, UKP, UCPX, and UKPX) Insert bearings are designed to fit into bearing housings. They are often sold when assembled into a suitable bearing housing but may also be bought alone.Pillow blocks – these include UCP, HCP, UCLP, UKP, UCPX, and UKPX,UCF, HCF, UKF, UCFX, UKFX, UCFU, UCFC, UKFC, UCFS, UCFL, UKFL, UCFT, UCT, HCT, and UKT,UCC, HCC, and UKC,SAFD, SBFD, SAFW