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| PartNumber | D38999/20JH53AA | D38999/20JH53AB | D38999/20JH53AC |
| Description | Circular MIL Spec Connector CTV 53C 53#20 PIN RECP | Circular MIL Spec Connector SQUARE FLANGE RECEPTACLE | Circular MIL Spec Connector SQUARE FLANGE RECEPTACLE |
| Manufacturer | Amphenol | TE Connectivity | TE Connectivity |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Number of Positions | 53 Position | 53 Position | - |
| Insert Arrangement | 23 - 53 | 23 - 53 | - |
| 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 | - | - |
| Brand | Amphenol Aerospace | TE Connectivity / DEUTSCH | TE Connectivity / DEUTSCH |
| Shell Plating | Olive Drab Cadmium | Olive Drab Cadmium | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Composite | Composite | - |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | - | - |
| Part # Aliases | 88-579778-53G | - | - |
| RoHS | - | N | N |