Cylindrical Coiled Tension Spring are helical springs that are subjected to axial tension, and extension springs are generally made of round cross-section material. When not under load, the coils of an extension spring are generally tightened together with no gap between them.
They can be used in many applications such as production assembly, experimentation, research and development, maintenance, and so on. Tension springs occupy an important position in the global market and are widely used in the fields of national defense, marine, computers, electronics, automobiles, molds, medicine, biochemistry, aerospace, railroads, nuclear power, wind power, thermal power, construction machinery, mining machinery, construction machinery, elevators and so on.

拉伸弹簧（也叫拉力弹簧，简称拉簧）是承受轴向拉力的螺旋弹簧，拉伸弹簧一般都用圆截面材料制造。在不承受负荷时，拉伸弹簧的圈与圈之间一般都是并紧的没有间隙。
它们可以用于许多场合，如生产装配、实验、研发、维修等。拉簧在全球市场上占有重要地位，广泛地应用于国防、海洋、计算机、电子、汽车、模具、医学、生物化学、航天、铁路、核电、风电、火电、工程机械、矿山机械、建筑机械、电梯等领域。