Square U Bolts are the shape of a "U" with two legs. The threaded ends are designed for use with washers and nuts and can also be used with a crosspiece spanning both threaded arms of the bolt to make it more secure in certain settings and uses. U-bolts are designed to be inserted through holes that have already been drilled or punched Square bend U-bolts are typically used for attaching product to a square shaped post. They can also be embedded in concrete and used as anchor bolts. Round bend U-bolts are typically used for attaching pipe or steel round bar to a round wood or steel post. Another common application is to secure or hang pipe in mechanical installations Material / Coating: Marine Grade Stainless Steel A4-70 G316 is the ultimate corrosion resistance fastener. Designed to be used in all conditions. The best fastener for marine coastal chemical and food environments. Stainless steels are largely non-magnetic but it is common for stainless steel fasteners to show a small degree of magnetism which is a result of work-hardening during the manufacturing process Galling: can occur when excessive pressure is used to tighten a nut onto a thread common with stainless fasteners but can also be an issue with other materials. Fasteners with damaged or fine threads are particularly prone to galling. Some suggestions to help prevent thread galling: Tightening the nut more slowly without excessive pressure will frequently reduce or sometimes solve completely the problem. As the installation RPM speed increases the heat generated with friction during tightening escalates the chances of thread galling. Reduce the friction by applying a suitable lubricant to the thread frequently eliminates thread galling. Typical lubricants are chloride-paraffine molykoat lacquer molybdenum disulphide high pressure oil graphite mica or talc some assemblies where there is extreme pressure corrosion resistant grease or waxes may also be effective Thread Pitch (Metric): is the distance between the peaks of two threads along a screw bolt nut or fastener expressed in millimetres (mm). Used when referring to Metric parts. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.