SAE AS4251

This specification establishes the requirements for a probe type self-sealing, self-aligning, non-locking coupling intended for aerospace hydraulic and cooling systems. Fluid self-sealing disconnect couplings shall be of the following classes: Class 500: 500 lbf/in2 rated pressure (psi) and Class 4000: 4000 lbf/in2 rated pressure (psi).