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| PartNumber | D38999/20FH21AA | D38999/20FH21AB | D38999/20FH21AC |
| Description | Circular MIL Spec Connector DTS 21C 21#16 PIN R ECP | Circular MIL Spec Connector TV 21C 21#16 PIN RECP | Circular MIL Spec Connector TV 21C 21#16 PIN RECP |
| Manufacturer | TE Connectivity | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | Y | - | - |
| Number of Positions | 21 Position | 21 Position | 21 Position |
| Insert Arrangement | 23 - 21 | 23 - 21 | 23 - 21 |
| Contact Gender | Without Pin Contacts | Without Pin Contacts | Without Pin Contacts |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | MIL-DTL-38999 III |
| Product | Receptacles | Receptacles | Receptacles |
| Shell Size | 23 | 23 | 23 |
| Shell Style | Wall Mount | Wall Mount | Wall Mount |
| Mounting Style | Panel | Panel | Panel |
| Termination Style | Crimp | Crimp | Crimp |
| Current Rating | 13 A | 13 A | 13 A |
| Series | D38999 Series III | D38999 III | D38999 III |
| Brand | TE Connectivity / DEUTSCH | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Nickel | Nickel | Nickel |
| 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 | 38999 |
| Unit Weight | 0.035274 oz | - | - |
| Part # Aliases | - | 91-565838-21I | 91-565838-21K |