Designation
                
                With shiled :637
	                
                
                Open type :637ZZ1
	                
                
                With seal VV :637VV
	                
                
                With seal DD :637DD
	                
                
                Principal dimensions(mm)
                
                d :7
	                
                
                D :26
	                
                
                B :9
	                
                
                B1 :9
	                
                
                r(min) :0.3
	                
                
                Basic load ratings(N)
                
                Cr :4550
	                
                
                Cor :1970
	                
                
                Basic load ratings{kgf} 
                
                Cr :465
	                
                
                Cor :201
	                
                
                Speed ratings(rpm)  
                
                Grease
                
                ZZ :28000
	                
                
                D·D :22000
	                
                
                Oil 
                
                Z :34000
	                
                
                Abutment and fillet dimensions (mm)
                
                da(min) :9
	                
                
                db(max) :12.8
	                
                
                Da(Max) :24
	                
                
                Db(min) :22.8
	                
                
                ra(max) :0.3
	                
                
                rb(max) :0.3
	                
                
                Weight(g) 
                
                Open type :24
	                
                
                With shiled :25