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. First and foremost, it is a ...

Straight thread fittings use an O-ring or some other means of sealling where as mentioned pipe thread is tapered. Getting fittings to line up is easy. I see them most for hydraulic fittings (not ...