METRIC DIN 931 ISO 4014 BS3692
HEXAGON BOLTS ALWAYS HAS A PLAIN SHANK THEN THREAD.
TO DETERMINE THREAD LENGTH AS A RULE IT'S TWICE THE DIAMETER PLUS 6mm GIVING YOU THE THREAD LENGTH, THEN IF YOU DEDUCT THE THREAD FROM THE OVER ALL LENGTH YOU WILL KNOW THE LENGTH OF THE PLAIN SHANK FROM UNDER THE HEAD.
HEXAGON BOLT ARE ALWAYS MEASURED FROM UNDER THE 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.