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| PartNumber | D38999/20FG75BB | D38999/20FG75BC | D38999/20FG75BA |
| Description | Circular MIL Spec Connector 4P Size 20 Wall Mount Recept Socket | Circular MIL Spec Connector 4P Size 20 Wall Mount Recept Socket | Circular MIL Spec Connector 4P Size 20 Wall Mount Recept Socket |
| 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 | 4 Position |
| Insert Arrangement | 21 - 75 | 21 - 75 | 21 - 75 |
| Contact Gender | Without Socket Contacts | Without Socket Contacts | Without Socket Contacts |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | MIL-DTL-38999 III |
| Product | Receptacles | Receptacles | Receptacles |
| Shell Size | 21 | 21 | 21 |
| Shell Style | Wall Mount | Wall Mount | Wall Mount |
| Mounting Style | Panel | Panel | Panel |
| Termination Style | Crimp | Crimp | Crimp |
| Current Rating | 46 A | 46 A | 46 A |
| Series | D38999 III | D38999 III | D38999 III |
| Brand | Amphenol Aerospace | 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 | Aluminum | Aluminum | Aluminum |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |
| Contact Plating | - | - | Gold |
| Contact Material | - | - | Copper Alloy |
| Mounting Angle | - | - | Straight |
| Mating Style | - | - | Self Locking |
| Qualification | - | - | EREL |
| Factory Pack Quantity | - | - | 1 |