SAE J1926-1 is also known as SAE Straight Thread O-Ring and O-Ring Boss (ORB). For hydraulic systems of medium or high pressure, this connection is the best for leakage control. Both the male and female portions of the connection have straight threading. The male portion has an O-ring on the end, while the female has a machined surface with minimal spotface and a chamfer to accept the male’s O-ring. The seal takes place between the chamfer and the O-ring. The threads hold the connection mechanically.
SAE J1453 is also called O-Ring Face Seal (ORFS). This is the very best connection for leakage control. The male portion has an O-ring in the face and straight threads. The female also has straight threads and a machined flat face. The seal takes place between the O-ring and the flat face of the female. The threads hold the connection mechanically.