Abstract: A thread retained security bolt system has a bottom collar and a top collar, the bottom collar fixed to one element of an enclosure and the top collar affixed to a mating element of the enclosure. The top collar carries a minor part of a securing bolt bearing surface and the bottom collar carries a major part of the securing bolt bearing surface and when the mating element of the enclosure is brought into engagement with the one element of the enclosure, the minor part is aligned with and contiguous to the major part upon joinder of the top collar with the bottom collar. A bearing surface of a head of a bolt is then moved into engagement with the minor part and the major part to secure the one element to the mating element.