SAE Straight Thread (ORB)
SAE Straight Thread O-Ring
This fitting is also known as O-Ring Boss (ORB)
Recommended by the NFPA for optimal leakage control in medium and high pressure hydraulic systems. The male fitting has a straight thread and O-ring. The female port has a straight thread, a machined surface (minimum spotface) and a chamfer to accept the O-ring. The seal take place by compressing the O-ring in the chamfer. The threads hold the connection mechanically.