Features: Reduction of noise levels. Reduction of system damaging vibration. Axles are independently spring loaded. Greater bearing life. Stainless steel, PVC, aluminium & mild steel tubes. Stamping type, semi precision, precision sealed & stainless steel bearings. Female threaded, male threaded & spring loaded axles. Product Description Gravity Roller, use precision bearing, stable turning, suit for most of gravity conveyor. Applicable conveyor type: Gravity roller conveyor Travel Goods: Carton, drum, steel container etc. Applicable situation: Indoor transportation Bearing unit: Plastic bearing house, Nylone 66 Cover material: PP 6002 double face sealed precision bearing GB/T276-94 Stainless steel welded tube GB/T12770-2002 Outter diameter: 38, 50, 60mm Shaft: Cold round steel GB/T905-1994 Cold hex steel GB/T905-1994 Spring loaded type diameter 11hex, 12mm Female thread type diameter 12mm Full mortise type diameter 12mm Surface treatment: none Extensive use transporting roller, roller, gravity roller, conveyor roller