Hollow Spring Mounts also known as Bolster Springs or Cushion Mountings are usually installed in pairs, at a predetermined angle to a vertical axis such that the rubber is loaded in both shear and compression.

Hollow Spring Mounts are primarily used in suspension systems to provide cushion to the leaf springs for heavy duty truck applications upto 60 tons of load.

Being installed as a twin-axle unit, the pair is connecting to the vehicle axle with the leaf spring. Compared to the usual steel supports, they offer noise reduction, improved driving comfort and stability as well as protection of the leaf spring from wear and off-highway vehicles.