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| PartNumber | MS27505E21F35S | MS27505E21F35SA | MS27505E21F35S-LC |
| Description | Circular MIL Spec Connector RECPT 79P SZ 21 SOC | Circular MIL Spec Connector 79P 21 SIZE BOX MOUNT RECEPTACLE SKT | Circular MIL Spec Connector 79P Sz 21 Box Mount Recpt Skt |
| Manufacturer | Amphenol | Amphenol | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| RoHS | N | N | - |
| Number of Positions | 55 Position | 55 Position | - |
| Insert Arrangement | 21-35 | 21-35 | - |
| Contact Gender | Socket (Female) | Socket (Female) | - |
| MIL Type | MIL-DTL-38999 | MIL-DTL-38999 | - |
| Product | Receptacles | Receptacles | - |
| Shell Size | 21 | 21 | - |
| Shell Style | Box Mount | Box Mount | - |
| Termination Style | Crimp | - | - |
| Series | MS 38999 I | MS 38999 I | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | - |
| Shell Plating | Passivated Steel | Passivated Steel | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Qualification | EREL | - | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | 38999 | - |
| Part # Aliases | 91-542837-35S | 91-542837-35F | - |
| Unit Weight | 0.035274 oz | - | - |