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| PartNumber | D38999/20WG75SN | D38999/20WG75SN-LC | D38999/20WG75SN-UHST4 |
| Description | Circular MIL Spec Connector 4P RCPT SZ 21 SKT WL MNT | Circular MIL Spec Connector 4P RCPT SCKT | Circular MIL Spec Connector TV 4C 4#8(TWINAX SKT RECP |
| Manufacturer | Amphenol | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | N | N | N |
| Number of Positions | 4 Position | 4 Position | - |
| Insert Arrangement | 21 - 75 | 21-75 | - |
| Contact Gender | Socket (Female) | Without Socket Contacts | - |
| MIL Type | 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 | - | - |
| Current Rating | 46 A | 46 A | - |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | D38999 III | D38999 III |
| Mounting Angle | Straight | Straight | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Olive Drab Cadmium | Olive Drab Cadmium | - |
| Mating Style | Self Locking | Self Locking | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Qualification | EREL | EREL | - |
| Shell Material | Aluminum | Aluminum | - |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |
| Unit Weight | 0.035274 oz | - | - |