Abstract: A precast reinforced concrete exterior wall panel is connected in a building between supporting columns by connectors which enable the panel to carry lateral shear loads in the building. As precast, the panel includes encased but not embedded steel straps which extend end to end in the panel for carrying loads applied to the panel ends via the connectors. The connectors include face abutting mating moieties. The mating faces of each moiety defines a regularly repeating grid pattern of projections and recesses so arranged that the moieties are engageable in face abutting relation with the projections of each engaged in the recesses of the other at any of a plurality of discrete relative positions of the moieties. When so engaged and clamped together, the connector moieties cooperate to carry shear loads across the plane of the mated faces. One moiety is connected to a panel strap end and the other is embedded in or affixed to an adjacent column.