Nuts and washers range 

Nuts

Hexagonal and square weld nuts from M4 to M16
Hexagonal nuts from M3 to M80
Self locking with plastic insert nuts from M4 to M48 and unified American coarse thread
All metallic self locking nuts from M3 to M24
Acorn and domed cap nuts self locking and normal type from M5 to M20
Castle nuts from M8 to M56

Washers

Plain normal, large and extra large, diameter from 2 to 165 mm
Square taper washers for "I" section from diameter 8 to 39 mm
Conical spring, plain safety, notched washer from 2 to 26 mm
Elastic norma, strong and square section type from 2 to 36 mm
Curved or crinckled spring elastic from diameter 2 to 36 mm
External and external tab washer from 4 to 5 mm
External and external toothed serrated lock washer from 2 to 30 mm
Spring washer and retain for shaft from 0,8 to 16 mm
Round and square fasteners from 1,5 to 8 mm