Abstract: A locking bolt for helping make connections between beams and columns of a building under construction includes an elongated body having a rear threaded section. This threaded section connects with a smooth toggle section having a rounded front end. An inverted L-shaped slot in the toggle section includes a deep front recess that connects with a shallow rear recess. A toggle bar is carried in the slot by a pivot pin that extends loosely through an opening in a base of the toggle bar. Connecting with the toggle base is a rearward extending locking arm. When the toggle bar locking arm seats in the slot, the front end of locking bolt may readily pass through bolt holes in a beam and a web of an adjoining column. Once the toggle bar is clear of the column web, the toggle bar locking arm is free swing from the slot and into a locking mode where held by interference fits between edge segments of the toggle bar base and walls of the slot deep recess.