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| PartNumber | D38999/26MH55SB | D38999/26MH55SA | D38999/26MH55SA-LC |
| Description | Circular MIL Spec Connector 55P SIZE 23 STRAIGHT PLUG SKT | Circular MIL Spec Connector STRAIGHT PLUG | Circular MIL Spec Connector 55P Size 26 Straight Plug Socket |
| Manufacturer | Amphenol | TE Connectivity | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| RoHS | N | Y | - |
| Number of Positions | 55 Position | 55 Position | - |
| Insert Arrangement | 23 - 55 | 23 - 55 | - |
| Contact Gender | Socket (Female) | Socket (Female) | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Plugs | Plugs | - |
| Shell Size | 23 | 23 | - |
| Shell Style | Straight | Straight | - |
| Mounting Style | Free Hanging | Free Hanging | - |
| Termination Style | Crimp | Crimp | - |
| Current Rating | 7.5 A | 7.5 A | - |
| Contact Plating | Gold | - | - |
| Contact Material | Copper Alloy | - | - |
| Series | D38999 III | - | - |
| Mounting Angle | Straight | - | - |
| Brand | Amphenol Aerospace | TE Connectivity / DEUTSCH | - |
| Shell Plating | Nickel | Nickel | - |
| Mating Style | Self Locking | - | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Shell Material | Composite | Composite | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | - | - |
| Part # Aliases | 91-578858-55J | - | - |