The torque specification for u-bolts is based on the size of the bolt, its application and the material used. Generally speaking, a grade 5 or 8 steel u-bolt should be torqued to between 30 and 50 foot pounds. For stainless steel bolts, it is best to use a slightly higher torque rating typically around 70 foot pounds. If your application requires a different material than standard steel or stainless then consult with an engineer or manufacturer’s literature for specific requirements as they will vary significantly from one material to another. Additionally, many applications will require additional hardware such as washers and nuts that need to be properly tightened in order to meet safety requirements so always ensure you are following the manufacturers’ instructions when installing your new u-bolts!