METRIC DIN 603 ISO 8677 BS 4933
KNOWN AS - CUP SQUARE BOLTS, COACH BOLTS, CARRIAGE BOLTS.
CUP SQUARE BOLTS ARE MEASURED FROM UNDER THE HEAD.
GRADE 4.6 STD MILD STEEL ZINC PLATED.
GRADE A2 = 304 STAINLESS STEEL.
GRADE A4 = 316 STAINLESS STEEL.
CUP SQUARE BOLTS ZINC COME COMPLETE WITH NUTS.
CUP SQUARE BOLTS STAINLESS STEEL COMES AS A BOLT ONLY.
IF YOU REQUIRE NUTS THEY ARE ORDERED SEPARATELY.