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| PartNumber | MS3451L12-5S | MS3451L12S-3A | MS3451L12-5B |
| Description | Circular MIL Spec Connector RECEPT | 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 | 1 Position | 2 Position | 1 Position |
| Insert Arrangement | 12-5 | 12S-3 | 12-5 |
| Contact Gender | Socket (Female) | Without Pin Contacts | Without Socket Contacts |
| MIL Type | MIL-DTL-5015 | MIL-DTL-5015 | MIL-DTL-5015 |
| Product | Receptacles | Receptacles | Receptacles |
| Shell Size | 12 | 12 | 12 |
| Shell Style | In-Line | In-Line | In-Line |
| Series | Matrix | Matrix | Matrix |
| Packaging | Bulk | Bulk | Bulk |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Shell Plating | Electroless Nickel | Electroless Nickel | Electroless Nickel |
| Mating Style | Threaded | Threaded | Threaded |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Aluminum | Aluminum | Aluminum |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Part # Aliases | 3451L125S | 3451L12S3A | 3451L125B |