FASTENERS / FIXINGS AND TOOLS

METRIC      DIN 557      ISO N/A      BS 2708

THIS IS A SQUARE NUT NOT A THIN OR ROOFING NUT, ROOFING OR THIN NUTS ARE FLATTER AND THINNER THAN SQUARE NUTS.

GRADE      5                   STEEL ZINC PLATED.

GRADE      A2 = 304      STAINLESS STEEL.

GRADE      A4 = 316      STAINLESS STEEL.