Item NO:UCP201~UCP220UCP Standard duty,Wider inner ring bearing, Setscrew locking,Cast gray iron housing . Cast ductile iron housing available upon request.Housing: HT200 cast grey iron. Zerk fittings: Zinc plated A3 steel. Insert bearing: Gcr15(AISI52100) steel,heat treated,precision ground,raceway superfinished. Steel ball:G10 only. Retainer: Low noise refined cage. Lubricant: Low noise,high speed/load SHELL GADUS S2 V220 2 only. Outer ring with grease groove and holes,at same side of setscrew With anti-rotation pin at opposite side of setscrew Setscrew port annealed. Phone: +86-592-580 8851 / +86-592-580 7618Email: sales@ldk-bearing.com ; benjamin@ldk-bearings.com