Previously the 45° version of SAE J512 was talked about. This is also known as Inverted Flare and is a connection frequently used in automotive systems. The female is always a straight thread with a 42° inverted flare. The male is either in tube fitted or machined adapter form. The tube fitted has the male in a 45° flare and the machined adaptor has the male in a 42° seat. The seal between the male and female takes place on the flared surfaces. The threads hold the connection mechanically.
SAE J518 is known as Four-Bolt-Flange or ISO 6162. This connection is used worldwide to connect larger sized hoses and tubing together in fluid power systems. The male portion has a ring groove in the flange head where an O-ring is inserted. The O-ring seals against a smooth faced female port. The connection is held by two clamp halves and four bolts in a rectangular pattern. There are two pressure classes for SAE J518: standard series Code 61 and high pressure (6,000 psi) Code 62. While the setup is also interchangeable with DIN 20066 and JIS B 8363, the bolt sizes are not.
