SAE AS85421B

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. This specification is revised to: (1) incorporate allowances for shape fittings to be manufactured from either: near-net forgings or bar-stock/oversized forgings per dimensions specified in AS1376. (2) Include qualification specifics for Nickel Alloy 718 fittings. (3) Include water as a test fluid for the Type IV System high-temperature burst pressure testing. (4) Replace the lot-to-lot destructive testing with periodic testing. (5) Incorporate an Appendix A, which is a Periodic Control Test Summary reporting format. (6) Align minimum “rate-of-rise” for Impulse Testing with AS603 so it is no longer an exception. (7) Include expanded bending-stress tables with additional higher pressure data-point references at lower cycles.

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