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| PartNumber | D38999/20MJ4SD-LC | D38999/20MJ4SDL/C | D38999/20MJ4SD |
| Description | Circular MIL Spec Connector CTV 143C 48#20 8#16 SKT RECP | Circular MIL Spec Connector 56P SKT CRIMP WM Rcpt w/seal | |
| Manufacturer | Amphenol | - | - |
| Product Category | Circular MIL Spec Connector | - | - |
| Number of Positions | 56 Position | - | - |
| Insert Arrangement | 25-4 | - | - |
| Contact Gender | Without Socket Contacts | - | - |
| MIL Type | MIL-DTL-38999 III | - | - |
| Product | Receptacles | - | - |
| Shell Size | 25 | - | - |
| Shell Style | Wall Mount | - | - |
| Mounting Style | Panel | - | - |
| Termination Style | - | - | - |
| Current Rating | 7.5 A | - | - |
| Contact Plating | - | - | - |
| Contact Material | - | - | - |
| Series | D38999 III | - | - |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | - | - |
| Shell Plating | Electroless Nickel | - | - |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | - | - |
| Qualification | EREL | - | - |
| Shell Material | Aluminum | - | - |
| Factory Pack Quantity | 1 | - | - |
| Subcategory | Circular Connectors | - | - |
| Tradename | 38999 | - | - |
| Part # Aliases | 91-578899-04N | - | - |