"No, you're NUTS". Yeah, we have arguments like that around here often. But in this case, you'll want these nuts if you're working with OpenBeam. OpenBeam uses regular DIN934 compliant M3 nuts - that's the entire selling point behind the system, with no proprietary nut plates to buy. While you can pick these up at any good hardware store, OpenBeam have started bulk packing nuts as a service to their customers.

We also have their mating bolts.

Plain steel M3 nuts, in packs of 100.