METRIC DIN 935 ISO 7035 BS 3992
CASTLE NUTS AND SLOTTED NUTS HAVE 6 SLOTS.
GRADE 4 STEEL SELF COLOUR OR ZINC PLATED.
GRADE 8 STEEL SELF COLOUR OR ZINC PLATED.
GRADE A2 = 304 STAINLESS STEEL.
UNC SELF COLOUR, ZINC PLATED, STAINLESS STEEL.
UNF SELF COLOUR, ZINC PLATED, STAINLESS STEEL.
BSF NON-PERFERRED CHECK AVAILABILITY.
WHITWORTH NON-PERFERRED CHECK AVAILABILITY.
METRIC FINE NON-PERFERRED CHECK AVAILABILITY.