Other common flare-type fittings are 30° and 45° flares. 30° fittings are generally used only for hose connections and may have either BSPP or metric threads. 45° flares connect to hard tube ...

This article was updated Jan. 17, 2023. It was originally published Oct. 21, 2004. Using the correct thread is critical for proper mating and replacing hydraulic fittings.