If you plan on keeping metric bolts secure on materials, then you'll need to get a set of metric nuts as well to support them. There are endless varieties, but if you take these actions when searching the market, you'll be able to find a compatible choice that works great.

Make Sure Nuts Will Resist Wear

In order to get metric nuts on bolts in a secure way, you'll have to turn them with a wrench. You may need to use some force too to get the nuts properly secure on metric bolts. That's not going to create issues if you find a nut variety that's capable of resisting wear.

This will come down to what the nut is made of and the protective coating it was treated with. Steel and titanium are some of the more durable materials you can find for metric nuts, and they would serve you well when getting metric nuts set up without damage happening.

Measure the Diameter of Metric Bolts

Whatever metric bolts you plan on setting up in materials, you need to measure their diameter because this is the only way you're going to be able to choose metric nuts that are the right size and thus fit around this diameter without any issues.

Just make sure you use the right measuring tool to gather these diameter dimensions before searching the metric fastener marketplace for nuts. Then after you figure out what nut size to get, you can have a smooth experience getting this fastener type set up. 

Go With Durable Internal Threading

The reason why metric nuts are able to secure to metric bolts is because of their internal threading. You want to make sure it's extremely durable because this will keep you from stripping it when setting nuts up on bolts for the first time. 

If you want to make sure the internal threading portion of your metric nuts is durable enough to hold up to your setup practices, then you can work with a metric fastener manufacturer and have them customize these nuts according to your durability preferences. 

In order to keep metric bolts secure, you need to buy complementary nuts for them. As long as you assess the right things and focus on getting durable properties, this metric fastener is going to be easy to set up and will continue holding up as long as you use them in the right ways. 

Contact a manufacturer to learn more about metric fasteners.