Fitting (Perm) Thermo SAE 37

On the connection side, it has a male JIC 37 degree end with a 0.4375 end size, and it is called out for -4 hose dash size. The opposite end is meant to work with line, hose, or tube, so it is set up for those common hydraulic configurations.

Carbon steel fittings can take a beating in harsh environments when they're coated right, and this one uses Dura-Kote plating specifically to fight corrosion. That coating is built to extend the life of hose assemblies, so it should hold up better than a standard uncoated steel fitting in tough conditions. It's a -4 hose dash size with a male JIC 37 degree end, weighs next to nothing at 0.17 lb, so it's not a heavy-duty beast by size but the surface protection is a real feature here.

Dura-Kote plating gives this fitting superior corrosion resistance, which should extend the life of your hose assembly, even with the vibrations you're talking about. It's made from carbon steel, so it's built tough.