Hex domed cap nuts (Acorn nuts)
BN 513
M3: not included in DIN 1587, M10; M12: wrench size according to ISO on request
Standard
                        ~DIN 1587
~UNI 5721
                    Features
| Material | 
                               
            Material
            Brass
 
     | 
                    
| Surface | 
                               
            Surface
            plain
 
     |