DIN 3570 specifies the requirements for U-Bolts (Round Steel Straps) designed for the attachment of steel pipes onto beam supports or within piping systems. It is the industrial benchmark for "Type A" U-bolts, providing a robust and adjustable fastening solution that accommodates thermal expansion and mechanical vibration in heavy-duty piping infrastructure.

These fasteners are typically manufactured from round steel bars and threaded on both ends, allowing them to wrap around a pipe and be secured to a mounting plate or structure using DIN 934 hex nuts and DIN 125 washers.

The technical utility of DIN 3570 revolves around dynamic load distribution. Unlike rigid clamps, a U-bolt allows for slight axial movement of the pipe (unless fully tightened as a fixed point), which is essential in systems where temperature fluctuations cause the metal pipes to expand or contract. The radius of the "U" is precision-engineered to match standard Nominal Pipe Sizes (NPS) and Diamètre Nominal (DN).