![]() Strong-Tie SD connector screws and Conquest fasteners are excellent galvanized screw options.ĭecking screws are typically comprised of carbon steel or stainless steel and are usually coated in a special ceramic coating to prevent rust. With treated lumber, it is recommended to use galvanized, stainless, or specially formulated coatings like Simpson’s Double-Barrier coating. All the hot dip galvanized and mechanically galvanized screws that Fasteners Plus carries, pair with the G90 galvanized and ZMAX Simpson wood connectors. Galvanized screws are comprised of a thick zinc coating that provides great corrosion resistance. Fasteners Plus also carries a variety of Simpson specialty stainless steel screws, stainless steel masonry screws, and Tapcon stainless steel screws. When it comes to rust-resistant screws, Conquest stainless steel screws are heavy-duty screws that are extremely rust-resistant. For maximum corrosion resistance in extreme environments, spending the extra money for 316-grade stainless is worth it. Both grades are appropriate for general use, although 305-grade screws have slightly greater corrosion resistance. The most widely available stainless steel screws are 304 and 305 grades. Stainless steel screws combine iron with chromium, as well as nickel, which increases corrosion resistance. This extra grip helps better resist the inevitable wood movement caused by moisture and humidity. When building outdoor projects such as boats, pergolas, or decks, screws are typically used over nails. Screws have additional gripping strength provided by their threads. The best screws for outdoor use to fight weather/rain are stainless steel screws, galvanized screws, and decking screws. The large gap in electric potential would quickly degrade the zinc screws, which would then weaken the structure.įasteners are comprised of a variety of finishes that affect their ability to resist corrosion and perform well outside. For that reason, you would not want to use zinc screws to fasten together stainless materials. When a load of a fastener bears constant change, the continuous change can accelerate corrosion.Īdditionally, the flow of electricity and the rate of corrosion are greater when flowing from a smaller object to a larger area. Click here to read more from Simpson Strong-Tie on which connector coatings match well with fastener coatings.Īlong with choosing screws similar in properties to the material you are fastening to, it is also crucial to intentionally install screws in a way that delivers constant pressure. A Type 316 stainless steel screw can be used with a connector with a Type 316 stainless steel finish. Prevent exposure and pooling of electrolytes.Īn example of choosing the right screw coating to match the connector coating is using a hot-dip galvanized screw with a connector that has a ZMAX or HDG galvanized finish.Cathode means it is a negatively charged electrode. Ensure the screw or anchor is the cathode when dissimilar connector metals are present.Use insulating materials to separate dissimilar metals.Use screws, anchors, and connectors with similar electrochemical properties. ![]() Choosing screws and connectors with finishes that have similar electric potential reduces the flow of electricity, which then reduces the rate of corrosion. There are several ways to reduce possible galvanic corrosion of screws and connectors.
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