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| PartNumber | D38999/20FG35AA | D38999/20FG35AB | D38999/20FG35AC |
| Description | Circular MIL Spec Connector | Circular MIL Spec Connector 79P SIZE 21 WALL MOUNT RECEPTACLE PIN | Circular MIL Spec Connector |
| Manufacturer | Glenair | Amphenol | Glenair |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Number of Positions | 79 Position | 79 Position | 79 Position |
| Insert Arrangement | 21 - 35 | 21 - 35 | 21 - 35 |
| Contact Gender | Without Pin Contacts | Without Pin Contacts | Without Pin Contacts |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | MIL-DTL-38999 III |
| Product | Receptacles | Receptacles | Receptacles |
| Shell Size | 21 | 21 | 21 |
| Shell Style | Wall Mount | Wall Mount | Wall Mount |
| Mounting Style | Panel | Panel | Panel |
| Termination Style | Crimp | Crimp | Crimp |
| Current Rating | 5 A | 5 A | 5 A |
| Brand | Glenair | Amphenol Aerospace | Glenair |
| Shell Plating | Nickel | Nickel | Nickel |
| 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 |
| RoHS | - | N | - |
| Contact Plating | - | Gold | - |
| Contact Material | - | Copper Alloy | - |
| Series | - | D38999 III | - |
| Mounting Angle | - | Straight | - |
| Mating Style | - | Self Locking | - |
| Qualification | - | EREL | - |
| Tradename | - | 38999 | - |
| Part # Aliases | - | 91-565837-35I | - |