INTERNATIONAL ISO STANDARD 4014 - iso-iran.iriso-iran.ir/standards/iso/ISO_4014_2011_,_Hexagon_Head_Bolts.pdfbe selected from
INTERNATIONAL ISO STANDARD 8676 - 8676 _ 1999.pdfINTERNATIONAL STANDARD ISO 8676 Second edition 1999-08-15 Hexagon head screws with metric fine pitch thread — Product grades - [PDF Document]