This is a great screw for deck boards in outdoor applications. But that is the extent of its application.
Anyone who has worked with redwood and cedar knows that how these materials can discolor at the nail or screw locations, and treated lumber will react with almost any metal. These screws have a warranty for the life of your project, and are coated with something to eliminate that problem. Warnings on the package lead me to think that it might be something containing lead. It is too soon to tell if these will discolor the wood, they shouldn’t, but it often takes a year or two depending on the climate. These are cedar tan colored, so they will blend in (until the cedar starts to weather).
A couple of features of these screws make them different than others. One is lack of thread on the upper shank. This should allow a tighter fit of the deck board to the joist, allowing it to draw up firmly. These are also self-tapping, so no pre-drilling is required and splitting is greatly reduced. The lower side of the head is ribbed for countersinking.
I found that the included T-25 torx bit was of poor quality and didn’t last long, so you should plan on using a higher end bit and a magnetic drive guide for easier installation. There seems to be more resistance to removing these screws, so I wonder if replacing a deck board in the future could be a problem if they do corrode slightly. Time will tell. I was also disappointed with the lack of any available information regarding their sheer strength, and there is no website information on the package, so I can only assume that they should NOT be used for any other application, such as headers, rim or joist connections that have any shear weight load, especially joist hangers.
Easy to Install, High Quality of Material, self-tapping, self-countersinking, corrosion proof?
no specs, deck boards only