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| PartNumber | D38999/20WG75PN-LC | D38999/20WG75PNLC | D38999/20WG75PN |
| Description | Circular MIL Spec Connector 4P FM SZ 21 PIN WL MNT | Circular MIL Spec Connector | Circular MIL Spec Connector 4P Sz 21 Wall Mount Recpt Pin Cont |
| Manufacturer | Amphenol | Amphenol | Souriau |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | N | - | N |
| Number of Positions | 4 Position | - | 4 Position |
| Insert Arrangement | 21-75 | - | 21 - 75 |
| Contact Gender | Without Pin Contacts | Without Pin Contacts | Pin (Male) |
| 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 |
| Current Rating | 46 A | - | 46 A |
| Contact Plating | - | - | Gold |
| Contact Material | - | - | Copper Alloy |
| Series | D38999 III | D38999 III | D38999 |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Souriau |
| Shell Plating | Olive Drab Cadmium | - | Olive Drab Cadmium |
| Mating Style | Self Locking | - | Bayonet |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Qualification | EREL | - | - |
| Shell Material | Aluminum | - | Aluminum |
| Factory Pack Quantity | 1 | - | 5 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | - |
| Voltage Rating | - | - | 1.3 kV |
| Unit Weight | - | - | 0.035274 oz |