The SDWH timber-hex HDG screw is a 0.276 in Dia hot-dipped galvanized screw suitable for marine and coastal applications. The SDWH timber-hex HDG screw has a saw tooth point and oversized integral washer that makes for fast installations, no pre-drilling or separate washer needed. Speed up your next pile job by replacing 3/4 and 5/8 in HDG bolt/washer/nut assemblies (two screws for one bolt in many conditions) with the strong-drive SDWH timber-hex HDG screw. It is code listed under IAPMO-UES ER-192 and meets 2015 and 2018 IRC and IBC code requirements for several common wood framing applications.