an integrated separation system and interface structure is disclosed for a variety of deployment applications . in one embodiment , a universal spacecraft separation node includes a separation nut assembly , a separation spring assembly an lv node fitting and an sc node fitting . the lv node fitting is connected to a launch vehicle and the sc node fitting is connected to a spacecraft . the separation nut assembly holds the fittings together until separation is desired . upon separation , the separation spring assembly provides a force to urge the launch vehicle and spacecraft apart . prior to separation , an annular tongue of fitting mates with an annular groove of fitting to resist shear forces .