Also known as square andrectangularcoldbendinghollowsection,referredtoas"square andrectangulartubes,code FandJ,respectively 1,theallowabledeviation inthewallthicknessofthemoment, when thewallthickness is notmore than10mmshallnotexceedthe nominal wallthicknessof plusorminus10%,whenthewallthickness is more than 10mm forthewallthicknessofplusorminus8%, except corners andweldareawallthickness.2,thetorquetubeusually delivery length is 4000 mm-4000mm,6000 mmand12000mminthe majority. Torque tubeallowdeliverynotlessthan2000mmshortfeet and the lengthoftheproduct,canalsointerfacetubeformdelivery, but thebuyerwhenuseinterfacetubeshouldberemoved.Short feet and non scaleproductweightisnotmore than5%ofthetotal amount ofdelivery,fortheoreticalweightgreaterthan20kg/msquare torque tube shallnotexceed10% ofthetotalamountofdelivery3, square torque tube bendingshallnotbegreaterthan2 mmpermetre,total bending shall not be greaterthan0.2%ofthetotal length