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| PartNumber | D38999/20FH55AA | D38999/20FH55AC | D38999/20FH55AB |
| Description | Circular MIL Spec Connector 55P Size 20 Wall Mount Recept Pin | Circular MIL Spec Connector DTS 55C 55#20 PIN RECP | Circular MIL Spec Connector DTS 55C 55#20 PIN R ECP |
| Manufacturer | Amphenol | TE Connectivity | TE Connectivity |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| RoHS | Y | - | Y |
| Number of Positions | 55 Position | 55 Position | 55 Position |
| Insert Arrangement | 23 - 55 | 23 - 55 | 23 - 55 |
| 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 | 23 | 23 | 23 |
| Shell Style | Wall Mount | Wall Mount | Wall Mount |
| Mounting Style | Panel | Panel | Panel |
| Termination Style | Crimp | Crimp | Crimp |
| Current Rating | 7.5 A | 7.5 A | 7.5 A |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | - | D38999 Series III |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | TE Connectivity / DEUTSCH | TE Connectivity / DEUTSCH |
| Shell Plating | Nickel | Nickel | Nickel |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | Circular MIL Spec Connector |
| Shell Material | Aluminum | Aluminum | Aluminum |
| Factory Pack Quantity | 1 | - | 1 |
| Subcategory | Circular Connectors | Circular Connectors | Circular Connectors |
| Tradename | 38999 | - | D38999 |
| Part # Aliases | 91-565838-55G | - | - |
| Unit Weight | - | - | 0.035274 oz |