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| PartNumber | D38999/20WG75SN-LC | D38999/20WG75SNLC | D38999/20WG75SN-UHST4 |
| Description | Circular MIL Spec Connector 4P RCPT SCKT | Circular MIL Spec Connector | 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 |
| Number of Positions | 4 Position | - | - |
| Insert Arrangement | 21-75 | - | - |
| Contact Gender | Without Socket Contacts | Without Socket Contacts | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Receptacles | - | - |
| Shell Size | 21 | - | - |
| Shell Style | Wall Mount | - | - |
| Mounting Style | Panel | - | - |
| Termination Style | - | - | - |
| Current Rating | 46 A | - | - |
| Contact Plating | - | - | - |
| Contact Material | - | - | - |
| Series | D38999 III | D38999 III | D38999 III |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Olive Drab Cadmium | - | - |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Qualification | EREL | - | - |
| Shell Material | Aluminum | - | - |
| Factory Pack Quantity | 1 | - | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |