| PartNumber | 64991-S28-4RLF | 64991-S28-4R | 64991-S28-4 |
| Description | Headers & Wire Housings Header 56pos | Headers & Wire Housings Header 56pos | Headers & Wire Housings Header 56pos |
| Manufacturer | FCI / Amphenol | FCI / Amphenol | FCI / Amphenol |
| Product Category | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| RoHS | Y | - | - |
| Product | Headers | Headers | Headers |
| Type | Shrouded | Shrouded | Shrouded |
| Number of Positions | 56 Position | 56 Position | 56 Position |
| Pitch | 2.54 mm | 2.54 mm | 2.54 mm |
| Number of Rows | 2 Row | 2 Row | 2 Row |
| Mating Post Length | 8.08 mm | 8.08 mm | 8.08 mm |
| Termination Post Length | 3.05 mm | 3.05 mm | 3.05 mm |
| Series | BergStik | BergStik | BergStik |
| Tradename | BergStik | BergStik | BergStik |
| Brand | Amphenol FCI | Amphenol FCI | Amphenol FCI |
| Product Type | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Factory Pack Quantity | 100 | 100 | 100 |
| Subcategory | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Part # Aliases | 64991S284RLF | 64991S284R | 64991S284 |