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| PartNumber | D38999/20MH55AE | D38999/20MH55AC | D38999/20MH55AD |
| Description | Circular MIL Spec Connector CTV 55C 55#20 PIN RECP | Circular MIL Spec Connector SQUARE FLANGE RECEPTACLE | Circular MIL Spec Connector CTV 55C 55#20 PIN RECP |
| Manufacturer | Amphenol | TE Connectivity | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Series | D38999 III | - | D38999 III |
| Brand | Amphenol Aerospace | TE Connectivity / DEUTSCH | Amphenol Aerospace |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | - | 38999 |
| RoHS | - | Y | - |
| Number of Positions | - | 55 Position | 55 Position |
| 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 |
| Shell Plating | - | Nickel | Nickel |
| Shell Material | - | Composite | Composite |
| Factory Pack Quantity | - | 1 | 1 |