Brakequip Fitting - Female7/16X24NS (FLAT) USA

This fitting uses the 7/16-24 NS thread, which is a recognized standard for brake line connections. You shouldn't have any trouble as long as the mating part follows the same standard.

Metal-to-metal contact is exactly how the flat seat configuration handles sealing. No gasket or separate washer is needed. The flat face mates directly against the corresponding surface in the brake hydraulic circuit, and that contact is what creates the leak-free seal. It's a common design choice for brake line fittings because it keeps the connection tight and reliable without extra components in the joint.

You are looking at a female-threaded fitting with a 7/16-24 NS thread and a flat seat. That flat seat is meant for a metal-to-metal seal in brake hydraulic circuits where leaks are a big deal.