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| PartNumber | D38999/20MC4SB | D38999/20MC4SA | D38999/20MC4SA-LC |
| Description | Circular MIL Spec Connector 4P SKT CRIMP WM Rcpt w/seal | Circular MIL Spec Connector 4P WL mnt soc sz 13 | Circular MIL Spec Connector CTV 4C 4#16 SKT RECP |
| Manufacturer | Amphenol | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | Y | Y | Y |
| Number of Positions | 4 Position | 4 Position | - |
| Insert Arrangement | 13 - 4 | 13 - 4 | - |
| Contact Gender | Socket (Female) | Socket (Female) | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Receptacles | Receptacles | - |
| Shell Size | 13 | 13 | - |
| Shell Style | Wall Mount | Wall Mount | - |
| Mounting Style | Panel | Panel | - |
| Termination Style | Crimp | Crimp | - |
| Current Rating | 13 A | 13 A | - |
| Series | D38999 III | D38999 III | D38999 III |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Nickel | Nickel | - |
| 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 | 38999 | 38999 |
| Part # Aliases | 91-578863-04J D38999/20MC04SB | 91-578863-04H D38999/20MC04SA | 91-578893-04H |
| Contact Plating | - | Gold | - |
| Contact Material | - | Copper Alloy | - |
| Mounting Angle | - | Straight | - |
| Mating Style | - | Self Locking | - |
| Qualification | - | EREL | - |