Simpson 7/8 x 32-7/8 Hot-Dip Galv Anchor Bolt SSTB28LHDGModel No. SSTB28LHDG Diameter. 7 8" Length. 32 7 8" Thread length. 6 1 2" Finish. Hot Dip Galvanized The SSTB anchor bolt is designed for maximum performance as an anchor bolt for holdowns and Simpson Strong Tie Strong Wall shearwalls. Extensive testing has been done to determine the design load capacity of the SSTB when installed in many common applications. The Simpson Strong Tie SSTB anchor bolts are code listed by ICC ES under the 2012, 2015, 2018