For use with softwoods like pressure treated lumber, we recommend that you use a torque washer as well. McFeely's offers these in 18-8 stainless and hot-dip galvanized as well (1/2" only). Torque washers are not recommended for use in tropical hardwoods like IPE due to the nature of their design.

18-8 Stainless Steel vs. Hot-Dip Galvanized

Stainless Steel carriage bolts are typically made of 18-8 grade stainless which offers good corrosion resistance and machines easily. They may stain if used in a seaside environment but are acceptable fasteners when used with ACQ pressure-treated material. Unlike many competing products, McFeely's stainless fasteners are passivated so thay may even be used below the waterline without fear of severe corrosion and eventual failure.

Hot-dip Galvanized bolts have been the standard for heavy-duty applictions for many years! Our hot-dip galvanized bolts have a minimum tensile strength of 60,000 PSI and conform to either ANSI/ASME B18.5 (carriage bolts) or ANSI/ASME B18.2.1 (lag screws and hex-head cap screws)