CAST CONNEX® Kaiser Bolted Brackets™ (KBB) are a prequalified connection for Special and Intermediate Steel Moment Frames per AISC 358 and can be used in the retrofit of seismically deficient steel moment framed buildings or in new construction. The KBB moment connection is designed to eliminate field welding and, when used in new construction, to facilitate frame erection.
There are two types of KBB available – those accommodating bolted connection to the beam flange (B-series) and those accommodating welded connection to the beam flange (W-series). Both types are designed to enable field bolting of the beam to the column, thus eliminating field welding. The B-series KBB are particularly well-suited to retrofit, as they offer a weld-free option for addressing seismically deficient steel moment frames.