Shear key is commonly used to connect two separate precast components in order to increase the interfacial shear resistance of the joint. The small dimensions of the shear key do not permit providing conventional reinforcement; consequently its ability to transmit shear force is mainly dependent on the mechanical properties of the used concrete. The enhanced shear capacity arising from using high strength concrete is always on the expense of the developed ductility. This paper presents an experimental and analytical investigation on the strength of the shear key connection in precast concrete construction that made of Strain Hardening Cementitious Composites (SHCCs). Thus, using of SHCCs, with their superior tensile strength and ductile behavior, in the shear key zone, not only improve both joint strength and ductility but also, control the cracks propagation as well. The shear keys test specimens were selected in the form of trapezium that is made up with 3 different key's angles. The main parameters for tests were the inclination angle of the shear key and the level of the confining stress. All specimens are tested using the ―push off‖ method in order to obtain the ultimate shear capacity of the connection. Accordingly, the overall shear behavior including ultimate shear resistance, crack pattern and modes of failure of the joints and the manifested slip were investigated. It was found that all tested specimens experienced shearing failure. However, SHCC shear keys are found to have more ductile mode of failure compared with that exhibited by normal strength concrete (NSC) specimen. It could be concluded that the use of SHCC significantly improves both the shear strength and the corresponding ductility of the joint. Based on the experimental results a simple analytical model is proposed for estimating the ultimate shear capacity of SHCC dry joint. The proposed analytical model showed good agreement with the experimental findings.