METRIC DIN 6334 ISO N/A BS N/A
HEAGON CONNECTING NUTS ARE ALSO KNOW AS STUD CONNECTORS OR ROD CONNECTORS, TO WORK OUT THE LENTH OF THE NUT, YOU TIMES THE THREAD BY 3 IE (IF IT'S M10 THEN TIMES IT BY 3 GIVES YOU 30, SO IT'S M10 X 30).
GRADE 4 STEEL SELF COLOUR OR ZINC PLATED.
GRADE 10 STEEL SELF COLOUR OR ZINC PLATED.
GRADE A2 = 304 STAINLESS STEEL.
GRADE A4 = 316 STAINLESS STEEL.