Blue Anodized Aluminum Tube Fitting (AN 818), -06 JIC 37 deg Flare Nut

Correct, the AN 818 flare nut is built for 37-degree JIC flare connections at the -06 dash size. That's the standard angle used across most JIC tube fittings, so as long as your tube end and mating adapter are both -06 JIC 37-degree, this nut will pair up with them just fine.