Also known as square andrectangularcoldbendinghollowsection,referredtoas "square andrectangulartubes,code FandJ,respectively 1,theallowable deviation inthewallthicknessofthemoment, when thewallthickness is not more than10mmshallnotexceedthe nominal wallthicknessof plus orminus10%,whenthewallthickness is more than 10mm for thewallthicknessofplusorminus8%, except corners and weldareawallthickness.2,thetorquetubeusually delivery length is 4000 mm- 4000mm,6000 mmand12000mminthe majority. Torque tube allowdeliverynotlessthan2000mmshortfeet and the length oftheproduct,canalsointerfacetubeformdelivery, but the buyerwhenuseinterfacetubeshouldberemoved.Short feet and non scale productweightisnotmore than5%ofthetotal amount of delivery,fortheoreticalweightgreaterthan20kg/msquare torque tube shall notexceed10% ofthetotalamountofdelivery3, square torque tube bending shallnotbegreaterthan2 mmpermetre,total bending shall not be greater than0.2%ofthetotal length