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| PartNumber | D38999/20FC4SA-LC | D38999/20FC4SA | D38999/20FC4SB |
| Description | Circular MIL Spec Connector DTS 4C 4#16 SKT REC P | Circular MIL Spec Connector | Circular MIL Spec Connector 4P RCPT SZ 13 SKT WL MNT |
| Manufacturer | TE Connectivity | Glenair | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | Y | - | N |
| Number of Positions | 4 Position | 4 Position | 4 Position |
| Insert Arrangement | 13-4 | 13 - 4 | 13 - 4 |
| Contact Gender | Without Pin Contacts | Socket (Female) | Socket (Female) |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | MIL-DTL-38999 III |
| Product | Receptacles | Receptacles | Receptacles |
| Shell Size | 13 | 13 | 13 |
| Shell Style | Wall Mount | Wall Mount | Wall Mount |
| Mounting Style | Panel | Panel | Panel |
| Termination Style | - | Crimp | Crimp |
| Contact Plating | - | - | Gold |
| Contact Material | - | - | Copper Alloy |
| Series | D38999 Series III | - | D38999 III |
| Mounting Angle | Straight | - | Straight |
| Brand | TE Connectivity / DEUTSCH | Glenair | Amphenol Aerospace |
| Shell Plating | Electroless Nickel | Nickel | Nickel |
| Mating Style | Self Locking | - | Self Locking |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Aluminum | Aluminum | Aluminum |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | D38999 | - | 38999 |
| Unit Weight | 0.035274 oz | - | 1.199985 oz |
| Current Rating | - | 13 A | 13 A |
| Qualification | - | - | EREL |
| Part # Aliases | - | - | 91-552003-04J D38999/20FC04SB |