Can be used for top-flange or face-mount installation Extra-long straps for height adjustability and top-flange installation convenience Dense nail pattern in the straps provides more installation options and allows for easy top-flange installation Min./max. nailing installation options Seat width: 7-1/4 in. The Simpson Strong-Tie THAC is a wood connector designed to support trusses and beams. This versatile U-shaped truss hanger features long, straight straps for applications where the height location of the truss needs to be adjustable. The field-adjustable THAC features concealed flanges for applications in restricted spaces.