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| PartNumber | D38999/24WG75PN | D38999/24WG75PN-UWBSB4 | D38999/24WG75PN-LC |
| Description | Circular MIL Spec Connector 4P RCPT SZ 21 PIN PNL MNT | Circular MIL Spec Connector TV 4C 4#8(TWIN) PIN J/N RECP | Circular MIL Spec Connector 4P Size 21 Jam Nut Pin Receptacle |
| 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 | Pin (Male) | - | Without Pin Contacts |
| MIL Type | MIL-DTL-38999 III | - | MIL-DTL-38999 III |
| Product | Receptacles | - | Receptacles |
| Shell Size | 21 | - | 21 |
| Shell Style | Jam Nut | - | Jam Nut |
| Mounting Style | Panel | - | Panel |
| Termination Style | Crimp | - | - |
| Current Rating | 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 Chromate over Cadmium |
| Mating Style | Self Locking | - | Self Locking |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Qualification | EREL | - | - |
| Shell Material | Aluminum | - | Aluminum |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |