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| PartNumber | MS27656T21B16A | MS27656T21B16B | MS27656T21B16AB |
| Description | Circular MIL Spec Connector RECEPT | Circular MIL Spec Connector 16P Sz 21 Wall Mount Recpt Skt | Circular MIL Spec Connector RECEPT |
| Manufacturer | Amphenol | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Series | D38999 III | MS 38999 I | D38999 III |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |
| Part # Aliases | 88-565557-16P | 88-565557-16S | 88-565557-16R |
| Number of Positions | - | 16 Position | - |
| Insert Arrangement | - | 21-16 | - |
| Contact Gender | - | Without Socket Contacts | - |
| MIL Type | - | MIL-DTL-38999 | - |
| Product | - | Receptacles | - |
| Shell Size | - | 21 | - |
| Shell Style | - | Wall Mount | - |
| Packaging | - | Bulk | - |
| Shell Plating | - | Olive Drab Cadmium | - |