Product features 1. Surface treatment: environmental protection galvanizing, neutral salt spray test, no white rust for 24 hours; It can be electrophoretic and sandblasting. 2. Rotating parts; Larger base plate and steel ball plate, double steel ball track, steel ball plate and base plate are heat treated to better increase the bearing strength and rotation flexibility of casters; 3. Firm welding process shall be adopted for the bottom plate of the support; 4. Bottom plate thickness: 6mm;; 5. Wheel material; The wheel adopts reinforced cast iron wheel core and internal stiffener; The outer skin is cast high-grade wear-resistant polyurethane elastomer; 6. Braking mode; Wheel surface brake; 7. Wheel color: the general color is red, and other black, blue and gray can be customized according to customer requirements. Product purpose 1. Cargo and container handling equipment; 2. All kinds of heavy objects handling appliances; 3. Necessary supplies for manufacturing and modeling enterprises such as automobile industry and electrical factory; 4. Special for automobile, spare parts and appliances. Wheel Diameter Tread Width Capacity Per Caster Wheel Bearing Modle number Load Height Swivel Radius (mm) (mm) (kg) Swivel Rigid (mm) (mm) 100 51 350 Moldon Polyurothano lron Core Double ball 4-4TO6S-431G 4-4TO6R-431G 143 90 450 Moldon Polyurethane lron Core (Thickened type) Double ball 4-4T06S-435G 4-4TO6R-435G 550 Glass Reinforced Nylon Roller 4-4TO6S-281E 4-4TO6R-281E Double ball 4-4T06S-281G 4-4T06R-281G 600 Casting Nylon Double ball 4-4T06S-261G 4-4TO6R-261G 550 Thermo Roller 4-4TO6S-551E 4-4TO6R-551E Double ball 4-4T06S-551G 4-4TO6R-551G 125 51 450 Moldon Polyurethane lron Core Double ball 4-5T06S-431G 4-5T06R-431G 165 108 500 Moldon Polyurethane lron Core (Thickened type) Double ball 4-5TO6S-435G 4-5T06R-435G 600 Glass Reinforced Nylon Roller 4-5TO6S-281E 4-5TO6R-281E Double ball 4-5T068-281G 4-5T06R-281G 650 Casting Nylon Double ball 4-5T06S-261G 4-5TO6R-261G 550 Thermo Roller 4-5TO6S-551E 4-5TO6R-551E Double ball 4-5T06S-551G 4-5TO6R-551G 150 51 500 Moldon Polyurethane lron Core Double ball 4-6T06s-431G 4-6TO6R-431G 191 127 550 Moldon Polyurethane lron Core (Thickened type) Double ball 4-6T06S-435G 4-6T06R-435G 650 Glass Reinforced Nylon Roller 4-6TO6S-281E 4-6TO6R-281E Double ball 4-6T06S-281G 4-6TO6R-281G 700 Casting Nylon Double ball 4-6T06S-261G 4-6TO6R-261G 600 Thermo Roller 4-6TO6S-551E 4-6TO6R-551E Double ball 4-6T06S-551G 4-6TO6R-551G 200 51 540 Moldon Polyurethane lron Core Double ball 4-8T06S-431G 4-8TO6R-431G 241 165 600 Moldon Polyurethane lron Core (Thickened type) Double ball 4-8T06S-435G 4-8TO6R-435G 700 Glass Reinforced Nylon Roller 4-8TO6S-281E 4-8TO6R-281E Double ball 4-8T06S-281G 4-8T06R-281G 750 Casting Nylon Double ball 4-8TO6S-261G 4-8TO6R-261G 650 Thermo Roller 4-8TO6S-551E 4-8TO6R-551E Double ball 4-8T06S-551G 4-8T06R-551G Remarks: For Caster With Brake, Please Add Brake Code after The Fork Code. For Example, Model Number for 4 Series 4" Swivel Top Plate Themo Caster with Metal Tread Brake is 4-4T06SB5-551G.