The spring-loaded insert, fitted on a semi-circular support to the inside of the band, guarantees constant tension and performance in case of variations in temperature, pressure or vibration.

The spring-loaded clamps, such as the ASFA L Constant Tension, are used mainly in the automotive sector, with tubes or hoses carrying hot air or on engine cooling systems, since the clamps used in these applications are subject to expansion and contraction alterations of their initial diameter.