The MS3108A2821P is a U.S. Military Standard aviation plug connector socket designed for reliability electrical connections in aerospace, defense, and other demanding environments. It is specified as a socket (receptacle) using the MS25042 shell and carries a 21position insert in the MS3108A family configuration. This part is intended to be mated with corresponding MS3108A plugs and related hardware to form a robust circular connector system. Key benefits MILSPEC reliability for missioncritical wiring in aircraft, ground support equipment, and defense systems. 21position configuration enables multisignal connections within a compact circular form factor. Compatibility with standard MS3108A mating components and MS25042 shell hardware, supporting broad interoperability across equipment. Robust, vibrationtolerant design suitable for harsh environments and frequent mating cycles. Professionalgrade connector suitable for aerospace, military, and other demanding applications. Key attributes Part number: MS3108A2821P Type: Aviation plug connector socket (receptacle) Shell reference: MS25042 Position count: 21 Assembly family: MS3108A series Environment: Military standard aerospace/defensegrade circular connector system Mating pair: Designed to mate with corresponding MS3108A plugs and MS25042compatible components Applications and use cases Aircraft avionics harnesses and cockpit wiring, where a rugged, reliable 21pin connection is required. Military ground support equipment, diagnostic/test rigs, and maintenance stations needing MILSPEC connectivity. Military land vehicles, naval systems, and other defense platforms that rely on durable circular connectors for critical signaling and power transmission. Notes For exact dimensional details, contact specifications, materials, finishes, and environmental ratings, refer to the official datasheet or supplier documentation. This description reflects the part's brand, model, and stated features without alteration.