Disc springs works standard
BN 806
| Material | 
            Material
            Spring steel
 | 
| Surface | 
            Surface
            phosphated and oiled
 | 
| Hardness | 
            Hardness
            42-52 HRC
 | 
All features
t (t') disc springs thickness more than 6mm, with bearing surface and reduced thickness (t')
Deflection h0 = l0-t (t')
Features
| Material | 
            Material
            Spring steel
 | 
| Surface | 
            Surface
            phosphated and oiled
 | 
| Hardness | 
            Hardness
            42-52 HRC
 |