Spring Loaded 1/4 turn fasteners are quick connect disconnect fasteners, or also quick release fasteners. Spring Loaded 1/4 turn fasteners give you quick access to panels by just doing a quarter turn.
Typically they consist of 3 components: a receptacle, a stud and a retaining washer ; the spring load is typically in the stud, but can also be in the receptacle.
Spring Loaded 1/4 turn fasteners full catalog can be downloaded from www.Turnlock.eu or https://anemo.eu/turnlock-quarter-turn