METRIC DIN 125 ISO 7089 BS 4320
THERE ARE MANY DIFFERENT FORMS OF FLAT WASHERS.
FORM B IS THE THINNER WASHER COMMONLY USED IN, STAINLESS STEEL AND BRASS.
FORM A IS SLIGHTLY THICKER COMMONLY USED IN, ZINC PLATED AND GALVANIZED.
FORM C IS THE SAME THICKNESS AS A FORM-A BUT BIGGER OUTSIDE DIAMETER.
FORM D IS THE SAME OUTSIDE DIAMETER AS A FORM-C BUT THINNER THAN THE FORM-C.
FORM G IS BIGGER IN OUTSIDE DIAMETER AND THICKNESS TO ALL OF THE FORM WASHERS.
AVAILABLE IN - SELF COLOUR, ZINC PLATED, BRASS, STAINLESS STEEL, NYLON, GALVANIZED.
MOST OF THESE WASHERS ARE AVAILABLE IN IMPERIAL.