Finger spring is inclined spring produced by high-tech computer spring machine, welding technology requirements are high, the bevel coil is a circular wire spring, the wire coil is elliptical, inclined, when compressed, each coil will produce separate deformation, no matter which part of the coil produces deformation, The entire spring will react to achieve a consistent load at each contact point.

For connectors, the ends of the springs are welded together to form a complete ring, and for the specific insertion or extraction stress requirements on each standard coil size, the springs can be placed in recesses in receptacle and plug designs. When the convex groove is inserted into the groove, the inclined coil spring of the spring is deformed under continuous spring stress and will cause resistance until the coil is paired with the groove. At this point, the load and groove design of the spring coil will generate continuous spring stress, so that a corresponding pull-out force is required to disconnect these two components, and the radial bevel coil spring has two key roles on the snap of the miniature connection and can reduce the number of components in the system.

Dongguan Spring Spring Electronics Co., Ltd. (SiS) was established in October 2011, specializing in the design, testing and manufacturing of elastic conductive electronic components, and moved to Chang'an Town, Dongguan in May 2018. The company has CNC lathe workshop, finger workshop, assembly workshop, laboratory. Based on the increasingly high requirements of the connector industry for high-current connectors, spring in the spring electronics has developed a new type of bidirectional coil spring finger (SiS®), single-turn spring finger, Constitute multiple columnar deformation contact points (up to 300 points or more). It can meet the service life of more than 100,000 times, the spring contact current density and temperature rise are close to the transmission cable, and the plugging force is about 10N. PCB board connectors (board-to-board USC, board-to-wire), cylindrical quick-swappable self-locking connectors (plastic and metal shells), male and female weight-load connectors, electric vehicle chargers, high-voltage power battery pack series connectors, used in Z advanced high-current energy collectors, energy storage and electrical equipment, such as: electric vehicles, charging base stations, wind energy generators, power supplies, high-speed rail, heavy trucks, etc. The company has a number of national patents, and the products have passed international standard testing.