One thing you need to figure out is the required coating on the fasteners. This is critical because the different types of fastener coatings you use can affect fastener life and ease of use. In addition to this, the fact that there are so many coatings for different applications means that if you are not careful, you may end up using the wrong coating. Some of popular such coatings include:
Zinc is one of common coatings for fasteners, mainly because it is inexpensive and protective. It is primarily used to protect fasteners from oxidative damage, such as rusting of sensitive metals. For this reason, this coating is suited for fasteners that will be used in wet areas where rust is likely to occur.
Gray phosphate is another popular coating designed to protect fasteners from corrosion. However, it is considered to provide a low level of protection. This means that it is not suitable for use where the risk of corrosion is very high. An example of this is marine applications. In fact, this type of coating is ideal for use in dry environments, not where fasteners may come into contact with large amounts of water. For optimum performance, this type of coating needs to be applied correctly. This means that when you want to use fasteners with a gray phosphate coating, it's wise to make sure you buy them from a manufacturer that works with a reputable coating company.
This is a coating applied to fasteners that provides a low level of corrosion protection. It can be used in situations where fasteners may come into contact with water or in wet conditions. Like grey phosphate, it must be applied correctly to provide the expected level of corrosion protection.