Thomson BSA uses SAE 660 bearing bronze for standard bronze nuts.SAE 660 bearing bronze which provides excellent load carrying ability, good wear resistance and is less susceptible to damage from impact and shock loading.SpecificationsSpecificationsValueMaterialSAE 660 bearing BronzePreloadNon-PreloadedTemperature Max250 °FThread DirectionRHDimensionsDimensionValue[A] Diameter2.25 in[B]2.25 in[C]0.53 in[TH]1.967-18Diameter, Nominal Screw1.5 inNut Dia2.25 inNut Length2.25 intravel per shaft rev0.2 inPerformancePerformanceValueDesign Load4600 lbfLoad, Static, Maximum23000 lbfTorque to Raise 1 lb2.31 oz-in