Standards: 
1) Flat washer: DIN125, DIN126, IFI L-2 USS/SAE type
2) Spring lock washer: IFI L-9, DIN 127, BS1802 
3) Nut: IFI D-6, DIN934, DIN555, IFI D-26, IFI D-21
4) Hex bolt: IFI C-6/A-6, IFI C-10/A-10, DIN931, DIN933, DIN601, DIN558
5) Carriage bolt: DIN603, IFI C-40