Q: What is the difference between the different grades of tungsten and why would I choice one vs the other?
A:Tungsten fasteners are available in commercially pure tungsten (Tungsten CP) which is 99.95% pure. This grade offers the highest density, strength and hardness of all the grades. It is also the most costly grade and the most limiting in the styles of fasteners that can be produced. If you don’t need pure tungsten screws for your application, then I would suggest using one of the other grades alloyed tungsten grades which are much easier to fabricate: Classes 1-4, each offers a slightly different density depending on the amount of tungsten it contains. For example, Tungsten class 1 fasteners only have 90% tungsten and are less dense than tungsten class 4 which contains 97% tungsten. The alloyed tungsten grades/classes also offer differing levels of strength. This chart will give you more information on the strength and density offered by each class of tungsten fastener.