Zinc-plated hexagon nut with fine thread.
Due to production, the thickness of the flat nut can vary between 4.9 and 5.5 mm.
| Material | Steel | 
| Surface | galvanized (blue) | 
| Nut type | Hexagon flat nut | 
| Thread type | MF17x1.25 (fine pitch thread) | 
| Drive | External hexagon | 
| Width across flats | 22 mm | 
| Height | 5.5 mm | 
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