Joist hangers are designed to provide support underneath the joist, rafter or beam to provide a strong a connection. Simpson Strong-Tie offers a diverse line of hangers to handle almost any application with top flange, concealed flange and field-skewable and slopeable options. SUL/SUR hangers provide a 45° connection between a joist and header. SUR Galvanized Joist Hanger for 2×4, Skewed Right (Pack of 50).