MS9020 and MS9021
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- MS9020, MILITARY STANDARD: PACKING, PREFORMED, (O) RING (01 JUN 1956) [SUPERSEDED BY SAE-AS3578]
- MS9021D, MILITARY STANDARD: PACKING, PREFORMED, (O) RING (25 JUL 1986) [SUPERSEDED BY SAE-AS3578]
- DESIGN GUIDANCE: MIL-HDBK-692B, MILITARY STANDARDIZATION HANDBOOK: A GUIDE TO THE SELECTION OF RUBBER O-RINGS (14 OCT 1983)
