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| PartNumber | D38999/20FJ4SA | D38999/20FJ4SB-LC | D38999/20FJ4SA-LC |
| Description | Circular MIL Spec Connector 56P SIZE 25 WALL MOUNT RECEPTACLE PIN | Circular MIL Spec Connector 43P SZ 25 WALL MOUNT SOCKET RECEPTACLE | Circular MIL Spec Connector 56P RCPT SZ 25 SKT WL MNT |
| Manufacturer | Amphenol | Amphenol | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| RoHS | N | N | - |
| Number of Positions | 56 Position | 56 Position | - |
| Insert Arrangement | 25 - 4 | 25-4 | - |
| Contact Gender | Socket (Female) | Without Socket Contacts | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Receptacles | Receptacles | - |
| Shell Size | 25 | 25 | - |
| Shell Style | Wall Mount | Wall Mount | - |
| Mounting Style | Panel | Panel | - |
| Termination Style | Crimp | - | - |
| Current Rating | 7.5 A, 13 A | - | - |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | D38999 III | - |
| Mounting Angle | Straight | Straight | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | - |
| Shell Plating | Nickel | Electroless Nickel | - |
| Mating Style | Self Locking | Self Locking | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Shell Material | Aluminum | Aluminum | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | 38999 | - |
| Part # Aliases | 91-552009-04H D38999/20FJ04SA | D38999/20FJ04SB-LC | - |
| Unit Weight | 3.409687 oz | 0.035274 oz | - |