METRIC DIN 933 ISO 4017 BS 3692
HEXAGON SETS SCREWS ARE ALWAYS MEASURED FROM UNDER THE HEAD AND ALSO THREADED TO HEAD.
GRADE 8.8 STD HIGH TENSILE STEEL.
GRADE 10.9 HIGH TENSILE STEEL.
GRADE A2 = 304 STAINLESS STEEL.
GRADE A4 = 316 STAINLESS STEEL.
AVAILABLE IN - BLACK OXIDE, ZINC PLATED, STAINLESS STEEL, BRASS, NYLON, GALVANIZED.
UNC BLACK OXIDE, ZINC PLATED, STAINLESS STEEL.
UNF BLACK OXIDE, ZINC PLATED, STAINLESS STEEL.
BSF NON-PERFERRED CHECK AVAILABILITY.
WHITWORTH NON-PERFERRED CHECK AVAILABILITY.
METRIC FINE NON-PERFERRED CHECK AVAILABILITY.