Commercial Grade. 5"x 5" reinforcing plates are used to back up the Single T Males and Females.

Part # 26413

Hardware is designed for use with 1-1/2" thick lumber (minimum width 6"). All standard hardware is mounted with 3/8" carriage bolts, (Part # 26534).  Use 1/2" carriage bolts (Part # 26535) on commercial grade.  All male and female dock-to-dock connections are made with 3/4" bolts with lock nuts or or 3/4" connecting pins.