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| PartNumber | D38999/20MH21SB | D38999/20MH21SA | D38999/20MH21SA-LC |
| Description | Circular MIL Spec Connector 21P SKT CRIMP WM Rcpt w/seal | Circular MIL Spec Connector 21P WL MNT SOC SZ 21 | |
| Manufacturer | Amphenol | - | - |
| Product Category | Circular MIL Spec Connector | - | - |
| RoHS | Y | - | - |
| Number of Positions | 21 Position | - | - |
| Insert Arrangement | 23 - 21 | - | - |
| Contact Gender | Socket (Female) | - | - |
| MIL Type | MIL-DTL-38999 III | - | - |
| Product | Receptacles | - | - |
| Shell Size | 23 | - | - |
| Shell Style | Wall Mount | - | - |
| Mounting Style | Panel | - | - |
| Termination Style | Crimp | - | - |
| Current Rating | 13 A | - | - |
| Series | D38999 III | - | - |
| Brand | Amphenol Aerospace | - | - |
| Shell Plating | Nickel | - | - |
| Product Type | Circular MIL Spec Connector | - | - |
| Shell Material | Composite | - | - |
| Factory Pack Quantity | 1 | - | - |
| Subcategory | Circular Connectors | - | - |
| Tradename | 38999 | - | - |
| Part # Aliases | 91-578868-21J | - | - |