What is the strongest grade bolt you can buy?

I'm curious, could you tell me what the strongest grade bolt you have available for purchase is? I'm looking for something that can withstand a significant amount of force and pressure, and I want to make sure I'm getting the most durable option possible. I understand that there are different grades and materials available, so I'm hoping you can provide me with some insight into which one would be the best fit for my needs. I'm interested in both the technical specifications and any real-world applications that these bolts might be used for.