Motor Vehicles - Safety Chains for Trailers with a Maximum Mass not Exceeding 3.5 t

This document establishes technical requirements and test methods for safety chains designed for semi-trailers with a maximum permissible mass not exceeding 3.5 tonnes. The scope covers the mechanical properties, dimensions, materials, and performance criteria necessary to ensure the secure connection between the towing vehicle and the trailer. It specifies limits for tensile strength, elongation, and resistance to corrosion under various environmental conditions. Detailed procedures are outlined for inspecting the chain links, welding quality, and protective coatings. Compliance with these specifications is essential for maintaining operational safety and reliability during transportation. The standard provides guidance on marking, packaging, and delivery to facilitate consistent manufacturing and quality control across the industry. By adhering to these guidelines, manufacturers can produce components that meet essential safety benchmarks. The document serves as a reference for engineering design, production processes, and quality assurance activities within the automotive supply chain. It aims to reduce the risk of mechanical failure and ensure the stability of the coupled vehicle system under normal and extreme operating conditions.