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| PartNumber | MS27505E21B35AC | MS27505E21B35BA | MS27505E21B35B |
| Description | Circular MIL Spec Connector RECEPT | Circular MIL Spec Connector 79P Sz 21 Box Mount Recpt Skt | Circular MIL Spec Connector 79P Sz 21 Box Mount Recpt Skt |
| Manufacturer | Amphenol | Amphenol | Amphenol |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Series | D38999 III | MS 38999 I | MS 38999 I |
| Brand | Amphenol Aerospace | Amphenol Aerospace | Amphenol Aerospace |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | 38999 | 38999 |
| Part # Aliases | 88-565517-35W | 88-565517-35F | 88-565517-35S |
| Number of Positions | - | 55 Position | 55 Position |
| Insert Arrangement | - | 21-35 | 21-35 |
| Contact Gender | - | Without Socket Contacts | Without Socket Contacts |
| MIL Type | - | MIL-DTL-38999 | MIL-DTL-38999 |
| Product | - | Receptacles | Receptacles |
| Shell Size | - | 21 | 21 |
| Shell Style | - | Box Mount | Box Mount |
| Shell Plating | - | Olive Drab Cadmium | Olive Drab Cadmium |
| Factory Pack Quantity | - | 1 | 1 |