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| PartNumber | D38999/20MH55AC | D38999/20MH55AB | D38999/20MH55AA |
| Description | Circular MIL Spec Connector SQUARE FLANGE RECEPTACLE | Circular MIL Spec Connector CTV 55C 55#20 PIN RECP | Circular MIL Spec Connector 55C 55#20 Pin REC |
| Manufacturer | TE Connectivity | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | Y | - | Y |
| Number of Positions | 55 Position | 55 Position | 55 Position |
| Insert Arrangement | 23 - 55 | 23 - 55 | 23 - 55 |
| Contact Gender | Without Pin Contacts | Without Pin Contacts | Without Pin Contacts |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | MIL-DTL-38999 III |
| Product | Receptacles | Receptacles | Receptacles |
| Shell Size | 23 | 23 | 23 |
| Shell Style | Wall Mount | Wall Mount | Wall Mount |
| Mounting Style | Panel | Panel | Panel |
| Termination Style | Crimp | Crimp | Crimp |
| Current Rating | 7.5 A | 7.5 A | 7.5 A |
| Brand | TE Connectivity / DEUTSCH | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Nickel | Nickel | Nickel |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Composite | Composite | Composite |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Series | - | D38999 III | D38999 III |
| Tradename | - | 38999 | 38999 |