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| PartNumber | D38999/20JH21SN-LC | D38999/20JH21SN |
| Description | Circular MIL Spec Connector 21P WALL MNT RECEP SOCKET | Circular MIL Spec Connector 21P SOCKET RECPT |
| Manufacturer | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Number of Positions | 21 Position | 21 Position |
| Insert Arrangement | 23-21 | 23 - 21 |
| Contact Gender | Without Socket Contacts | Socket (Female) |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III |
| Product | Receptacles | Receptacles |
| Shell Size | 23 | 23 |
| Shell Style | Wall Mount | Wall Mount |
| Mounting Style | Panel | Panel |
| Termination Style | - | Crimp |
| Contact Plating | - | Gold |
| Contact Material | - | Copper Alloy |
| Series | D38999 III | D38999 III |
| Mounting Angle | Straight | Straight |
| Brand | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Olive Drab Cadmium | Olive Drab Cadmium |
| Mating Style | Self Locking | Self Locking |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Aluminum | Composite |
| Factory Pack Quantity | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 |
| Part # Aliases | 88-578898-21S | 88-578868-21S |
| RoHS | - | N |
| Current Rating | - | 13 A |
| Qualification | - | EREL |