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| PartNumber | D38999/20FG75SA | D38999/20FG75SA-LC | D38999/20FG75SB |
| Description | Circular MIL Spec Connector 4P SIZE 21 WALL MOUNT RECEPTACLE SKT | 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 |
| Insert Arrangement | 21 - 75 | - | 21 - 75 |
| Contact Gender | Socket (Female) | Without Socket Contacts | Socket (Female) |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | MIL-DTL-38999 III |
| Product | Receptacles | - | Receptacles |
| Shell Size | 21 | - | 21 |
| Shell Style | Wall Mount | - | Wall Mount |
| Mounting Style | Panel | - | Panel |
| Termination Style | Crimp | - | Crimp |
| Current Rating | 46 A | - | 46 A |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | D38999 III | D38999 III |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Nickel | - | Nickel |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Aluminum | - | Aluminum |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |
| Part # Aliases | 91-552007-ABH | - | 91-552007-ABJ |
| Unit Weight | 4.313222 oz | - | 4.316221 oz |