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| PartNumber | D38999/26FH55PALC | D38999/26FH55PA | D38999/26FH55PA-LC |
| Description | Circular MIL Spec Connector Connectors, Interconnects - CONN HSG PLUG 55POS STRGHT PINS - Circular - Housings | Circular MIL Spec Connector 55P ST PLUG PIN SZ 23 | Circular MIL Spec Connector 55P Size 23 Pin Plug Straight |
| Manufacturer | Amphenol | Amphenol | - |
| Product Category | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Number of Positions | 55 Position | 55 Position | - |
| Insert Arrangement | 23-55 | 23 - 55 | - |
| Contact Gender | Without Pin Contacts | Pin (Male) | - |
| MIL Type | MIL-DTL-38999 III | MIL-DTL-38999 III | - |
| Product | Plugs | Plugs | - |
| Shell Size | 23 | 23 | - |
| Shell Style | In-Line | Straight | - |
| Mounting Style | Wire | Free Hanging | - |
| Termination Style | - | Crimp | - |
| Contact Plating | - | Gold | - |
| Contact Material | - | Copper Alloy | - |
| Series | D38999 III | D38999 III | - |
| Packaging | Bulk | - | - |
| Mounting Angle | Straight | Straight | - |
| Brand | Amphenol Aerospace | Amphenol Aerospace | - |
| Shell Plating | Electroless Nickel | Nickel | - |
| Mating Style | Self Locking | Self Locking | - |
| Product Type | Circular MIL Spec Connector | Circular MIL Spec Connector | - |
| Shell Material | Aluminum | Aluminum | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Circular Connectors | Circular Connectors | - |
| Tradename | 38999 | 38999 | - |
| RoHS | - | N | - |
| Current Rating | - | 7.5 A | - |
| Qualification | - | EREL | - |
| Part # Aliases | - | 91-552048-55G | - |