To ensure that your deck has a long, trouble free life, it's important to use the right fixings used to fix the planks to the bearers. This choice can be influenced not only by the prevailing climatic conditions, the proximity to marine environments, but also the actual wood used. As your deck will around for a long time, it's best not to compromise too much on the fixings as the higher cost of better quality products will be repaid many times over with a longer service life and better looking deck.
Normally, standard iron nails should not be used on external decking as they can rapidly corrode in certain climatic conditions or close to marine environments and not only leave black stains around the nail holes, but can eventually corrode so extensively that they will simply snap. Remember that all wood will twist and warp to some extent so its important that wood planks are firmly fixed to the bearers at regular spaced intervals to keep the timber from moving. If you wish to use nails, then you should use a good quality galvanized nail, recommended for exterior decking. Note that some species of lumber - in particular, Western Red Cedar, Merbau and Redwood - contain tannins that can cause corrosion to occur more rapidly than with other species of lumber.
If using screws to fasten the decking planks to the bearers, then again you shouldn't use standard steel screws, but either stainless steel or good quality plated screws. But there are many different methods of plating screws and some of the cheaper products may look great in the packet when they're purchased but not so pretty after a few years of use. Plating may be only superficial at best and in the process of fixing screws into the plank, the plating can be damaged which allows corrosion to start from day 1. So it's important that you use a good quality plated screw and is specifically recommended for use on exposed decking.
What is the difference between high-strength nuts and general nuts, in fact, you only need to understand their standards and other characteristics to easily distinguish them. The so-called high-strength nut is a special bolt with high strength and high fatigue resistance used in special equipment or engineering. Of course, generally high-strength nuts are used with high-strength bolts to achieve better application. We generally see that many bolts with M heads in the market are ordinary nuts, not high-strength nuts. The calibration side of the general hexagonal head nut is the following pattern M30, and M30 indicates the thread standard, that is, the inner diameter of the thread is 30mm. Grade 10 indicates the functional grade of the bolt, and tZn is the surface treatment method. Other types of bolts also have their own expressions, but generally threaded bolts have to use the original functional grade of "M": The functional level of the nut is divided into 3, 4, 4, 5, 5.8, 6...
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