The maximum temperature that bi-metallic lugs can handle really depends on the specific product and the manufacturer. Generally, industry standards and technical datasheets suggest that these lugs are rated for continuous operating temperatures between 90°C and 100°C for regular use. They can also endure short-circuit conditions up to 250°C. Some high-end or specialized bi-metallic lu... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php