Miniaturized inner core structure for optical fiber preformed end and combined suite thereof

The utility model discloses a miniaturized inner core structure for an optical fiber preformed end. The miniaturized inner core structure comprises an insertion core, a connecting nut and an inner core main body, the insertion core is arranged at the first connecting end of the inner core main body; a connecting nut is arranged outside the inner core main body in a sleeving manner, a step is further arranged outside the inner core main body, and the connecting nut is arranged at the step; and the external threads of the connecting nut are matched with the internal threads of different external members, so that the connecting nut is detachably connected with the different external members. The utility model further discloses a corresponding combined kit. According to the utility model, the inner core structure can be connected with a certain adapter, can be used as a miniaturized connector, can also be assembled with different suites, and is compatible with different types of optical fiber adapters; and the de