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| PartNumber | D38999/20JH21JA | D38999/20JH21JA-LC | D38999/20JH21JB |
| Description | Circular MIL Spec Connector CTV 21C 21#16 SKT RECP | Circular MIL Spec Connector CTV 21C 21#16 SKT RECP | Circular MIL Spec Connector SQUARE FLANGE RECEPTACLE |
| Manufacturer | Amphenol | Amphenol | TE Connectivity |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Number of Positions | 21 Position | - | - |
| Insert Arrangement | 23-21 | - | - |
| Contact Gender | Socket (Female) | Without Socket Contacts | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Receptacles | - | - |
| Shell Size | 23 | - | - |
| Shell Style | Wall Mount | - | - |
| Mounting Style | Panel | - | - |
| Termination Style | Crimp | - | - |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | D38999 III | - |
| Packaging | Bulk | - | - |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | TE Connectivity / DEUTSCH |
| Shell Plating | Olive Drab Cadmium | - | - |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Aluminum | - | - |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | - |
| RoHS | - | - | N |