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| PartNumber | D38999/20FG75SN | D38999/20FG75SN-UHST4 | D38999/20FG75SN-LC |
| Description | Circular MIL Spec Connector 4P RCPT SZ 21 SKT WL MNT | Circular MIL Spec Connector TV 4C 4#8(TWINAX) SKT RECP | Circular MIL Spec Connector 4P Size 20 Wall Mount Recept Socket |
| Manufacturer | Amphenol | Amphenol | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| RoHS | Y | - | - |
| Number of Positions | 4 Position | - | - |
| Insert Arrangement | 21 - 75 | - | - |
| Contact Gender | Socket (Female) | - | - |
| MIL Type | MIL-DTL-38999 III | - | - |
| Product | Receptacles | - | - |
| Shell Size | 21 | - | - |
| Shell Style | Wall Mount | - | - |
| Mounting Style | Panel | - | - |
| Termination Style | Crimp | - | - |
| Current Rating | 46 A | - | - |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | D38999 III | - |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | Amphenol | - |
| Shell Plating | Nickel | - | - |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Qualification | EREL | - | - |
| Shell Material | Aluminum | - | - |
| Factory Pack Quantity | 1 | - | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | 38999 | - |
| Part # Aliases | 91-552007-ABS | - | - |
| Unit Weight | 4.313752 oz | - | - |