SAE AS 85421 B:2018

1.1 Scope This specification covers the design requirements and test procedures for separable beam seal fittings which includes end fittings (see 2.3.4), fitting bodies (see 2.3.7), and boss fittings (see 2.3.2) for use in aerospace fluid systems. Design requirements are for class 3000 in corrosion resistant steel (15-5 PH, 17-4 PH CRES) only and for class 4000 in titanium alloy (Ti) and corrosion and heat-resistant steel (Nickel Alloy 718 CRES) only. Definition of fittings and related terms are defined in 2.3. 1.2 Classification Fittings shall be of the following type and pressure classes of the hydraulic system as specified below: 1.2.1 Type As defined in hydraulic system specifications AS5440 and AS8775. a. Type II System - Temperature range -65 to +275 °F (-54 to +135 °C). b. Type IV System – Temperature range -65 to + 630 °F (Nickel Alloy 718 fittings only). 1.2.2 Pressure Classes a. Class 3000 - 3000 psi (21000 kPa) nominal operating pressure where the cutout pressure at the main pressure controlling device is 3000 psig (21000 kPa) ± 15%. b. Class 4000 - 4000 psi (28000 kPa) nominal operating pressure where the cutout pressure at the main pressure controlling device is 4000 psig (28000 kPa) ± 15%.