Abstract: A bolt binder, particularly for a file or holder, comprises in combination a bolt, a round head, a press piece, a cap, a washer and, optionally, a connector. In use, the cap is received within the proximate end of the bolt, and the press piece fitted on the bolt can be desirably moved up and down to press against the papers bound thereunder. When the file is going to be closed, the round head and, optionally, the press piece may be removed, and thus the cap can be instead engaged on distal end of the bolt.