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| PartNumber | D38999/20FH21PN-LC | D38999/20FH21PN-CGMSS3 | D38999/20FH21PN |
| Description | Circular MIL Spec Connector TV 21C 21#16 PIN RECP | Circular MIL Spec Connector TV 21C 21#16 PIN RECP | Circular MIL Spec Connector 21P Sz 23 Wall Mount Recpt Pin Cont |
| Manufacturer | Amphenol | Amphenol | Souriau |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | Y | - | - |
| Contact Gender | Without Pin Contacts | - | Pin (Male) |
| MIL Type | MIL-DTL-38999 III | - | MIL-DTL-38999 III |
| Termination Style | - | - | Crimp |
| Contact Plating | - | - | Gold |
| Contact Material | - | - | Copper Alloy |
| Series | D38999 III | D38999 III | D38999 |
| Packaging | Bulk | - | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Souriau |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Factory Pack Quantity | 1 | - | - |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | - |
| Number of Positions | - | - | 21 Position |
| Insert Arrangement | - | - | 23 - 21 |
| Product | - | - | Receptacles |
| Shell Size | - | - | 23 |
| Shell Style | - | - | Wall Mount |
| Mounting Style | - | - | Panel |
| Current Rating | - | - | 13 A |
| Voltage Rating | - | - | 2.3 kV |
| Shell Plating | - | - | Nickel |
| Mating Style | - | - | Bayonet |
| Shell Material | - | - | Aluminum |
| Unit Weight | - | - | 1.861814 oz |