Pin and hanger assemblies are a common type of connection used in past engineering practice for steel girder bridges. The connection consists of pins, hanger plates, and girder ends. The connection detail was used widely between 1930 and 1980. The connections are considered fracture critical and nonredundant because connection failure can lead to collapse of the bridge. One such instance of such a failure was the 1983 collapse of the Mianus River Bridge in Connecticut. Despite the critical nature of these connections, current specification-based rating methods lack clarity for evaluation of existing bridges. Additionally, inconsistencies exist between different methodologies used in bridge rating and design. In this thesis a literature review is conducted to identify the available knowledge and experimental data for the elements that comprise pin and hanger connections. Relevant past experimental data are only identified for the hangers plates. The experimental data identified for hanger plates are compared against in-service hangers and found to be of smaller scale but to have similar proportions. The data are used to check the sufficiency of existing evaluation methods and new resistance factors are calibrated for prediction methods consistent with LRFR methods. Recommendations are made in the form of specification changes to improve rating methods for hanger plates and knowledge gaps for the remaining connection components are discussed.