pillow block bearing 1) Gcr15 bearings with cast-iron housing All Steel Bearings Units 2)UCP200 UCP204 UCP205 UCP206 UCP207-UCP300 SERIES UCF200 UCF204 UCF205 UCF206 UCF207-UCF300 SERIES UCFL200 UCFL204 UCFL205 UCFL206 UCFL207-UCFL300 SERIES UCT200 UCT204 UCT205 UCT206 UCT207 UCT208-UCT300 SERIES 3)Gcr 15 (AISI 52100/DIN 100Cr6/JIS SUJ2)chrome steel material 4)Tolerance standard: GB/T307(ISO492) 5)Hardness: HRC60-HRC65 6)ISO9001 certificate