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| PartNumber | D38999/20WH55AA | D38999/20WH55AC | D38999/20WH55AB |
| Description | Circular MIL Spec Connector RECEPT | Circular MIL Spec Connector | Circular MIL Spec Connector 55P PIN CRIMP WM Rcpt w/seal |
| Manufacturer | Amphenol | Glenair | ITT Cannon, LLC |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular Connectors - Housings |
| RoHS | N | - | - |
| Number of Positions | 55 Position | 55 Position | 55 |
| Insert Arrangement | 23 - 55 | 23 - 55 | - |
| Contact Gender | Without Pin Contacts | Without Pin Contacts | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Receptacles | Receptacles | - |
| Shell Size | 23 | 23 | - |
| Shell Style | Wall Mount | Wall Mount | - |
| Mounting Style | Panel | Panel | - |
| Termination Style | Crimp | Crimp | - |
| Current Rating | 7.5 A | 7.5 A | - |
| Series | D38999 III | - | Military, MIL-DTL-38999 Series III, KJB |
| Packaging | Bulk | - | Bulk |
| Brand | Amphenol Aerospace | Glenair | - |
| Shell Plating | Olive Drab Cadmium | Olive Drab Cadmium | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Shell Material | Aluminum | Aluminum | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | - | - |
| Part # Aliases | 88-565838-55G | - | - |
| Mounting Type | - | - | Panel Mount, Flange |
| Features | - | - | Shielded |
| Ingress Protection | - | - | Environment Resistant |
| Connector Type | - | - | Receptacle for Male Contacts |
| Orientation | - | - | B |
| Contact Type | - | - | Crimp |
| Shell Size Insert | - | - | 23-55 |
| Fastening Type | - | - | Threaded |
| Contact Size | - | - | 20 |
| Shell Size MIL | - | - | H |
| Shell Material Finish | - | - | Aluminum Alloy, Olive Drab Cadmium Plated |