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| PartNumber | D38999/20MJ4AD | D38999/20MJ4AE | D38999/20MJ4AN |
| Description | Circular MIL Spec Connector CTV 143C 48#20 8#16 PIN RECP | Circular MIL Spec Connector 143C 48#20 8#16 Pin REC | |
| Manufacturer | Amphenol | Amphenol | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Number of Positions | 56 Position | 56 Position | - |
| Insert Arrangement | 25 - 4 | 25 - 4 | - |
| Contact Gender | Without Pin Contacts | Without Pin Contacts | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Receptacles | Receptacles | - |
| Shell Size | 25 | 25 | - |
| Shell Style | Wall Mount | Wall Mount | - |
| Mounting Style | Panel | Panel | - |
| Termination Style | Crimp | Crimp | - |
| Current Rating | 7.5 A, 13 A | 7.5 A, 13 A | - |
| Series | D38999 III | D38999 III | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | - |
| Shell Plating | Nickel | Nickel | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Shell Material | Composite | Composite | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | 38999 | - |
| Part # Aliases | 91-579779-04M | D38999/20MJ04AE | - |
| RoHS | - | Y | - |