Profile: Metrol Springs Ltd. manufactures nitrogen gas springs. Our products include nitro springs, nitro-struts, die springs, metrol linkages, stock springs, and Metrol precision products. Nitro-springs are most commonly used in the metal pressing industry, replacing conventional die springs and press air cushions. Nitrogen gas springs offer high tonnages in compact spaces. The fixed force strut range can be supplied to any pressure within the range. The threaded ends allow a large variety of end fittings to be used, including bracket mountings.