The utility model discloses a fit -up man utensil is rolled over to restricted space bolt belongs to mechanical equipment installation maintenance field, and its characteristics are: it is including flexible universal joint, regular polygon permanent magnetism block, bolt and lock nut, the front end of flexible universal joint is fixed with the sleeve through the pin junction, and the hole in thissleeve is regular polygon, the telescopic downthehole fixed regular polygon permanent magnetism block who counts the looks adaptation rather than downthehole regular polygon limit that is provided with, the front end of bolt stretches into the interior lock nut that passes through of flexible universal joint from the universal joint rear end of stretching out and drawing back and fixes both in flexible universal joint rear end, wherein, the bolt accessible screw in or the modal alteration of screwing out its in the inside length of flexible universal joint. The utility model discloses simplestructure, preparation convenience, easy operation can realize the rapid disassembly and the installation of nut or bolt in restricted space, both practiced thrift cost and labour, also can not causethe damage to equipment, labour saving and time saving has fine practicality.