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| PartNumber | MS27499E18A66P | MS27499E18A66PA | MS27499E18A66S |
| Description | Circular MIL Spec Connector 66P Sz 18 Box Mount Recpt Pin | Circular MIL Spec Connector RECEPT | Circular MIL Spec Connector RECEPT |
| Manufacturer | Amphenol | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Number of Positions | 66 Position | 66 Position | 66 Position |
| Insert Arrangement | 18-66 | 18-66 | 18-66 |
| Contact Gender | Pin (Male) | Pin (Male) | Socket (Female) |
| MIL Type | MIL-DTL-38999 II | MIL-DTL-38999 II | MIL-DTL-38999 II |
| Product | Receptacles | Receptacles | Receptacles |
| Shell Size | 18 | 18 | 18 |
| Shell Style | Box Mount | Box Mount | Box Mount |
| Series | MS 38999 II | MS 38999 II | MS 38999 II |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Cadmium | Cadmium | Cadmium |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |
| Part # Aliases | 87-443036-66P | 87-443036-66E | 87-443036-66S |