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| PartNumber | D38999/20FH21SB | D38999/20FH21SA-LC | D38999/20FH21SA |
| Description | Circular MIL Spec Connector 21P Size 20 Wall Mount Recept Socket | Circular MIL Spec Connector TV 21C 21#16 SKT RECP | Circular MIL Spec Connector DTS 21C 21#16 SKT R ECP |
| Manufacturer | Amphenol | Amphenol | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| RoHS | Y | Y | - |
| 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 | - | - |
| Current Rating | 13 A | - | - |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | D38999 III | - |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | - |
| Shell Plating | Nickel | - | - |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Shell Material | Aluminum | - | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | 38999 | - |
| Part # Aliases | 91-552008-21J | - | - |
| Packaging | - | Bulk | - |