Hi, this is Colin from Simpson Strong-Tie. The H2.5AZ can be installed with .131" (8d) x 1 1/2" or 2 1/2" galvanized nails (does not have to be SImpson) or with Simpson's #9 1 1/2" SD Connector Screws (SD9112). If you need more information or have additional questions, please contact the Simpson Strong-Tie Customer Service team at 800-999-5099. Thank you.