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This standard BS EN 1665:1997 Hexagon bolts with flange. Heavy series is classified in these ICS categories:
21.060.10 Bolts, screws, studs
This European Standard specifies characteristics of hexagon bolts with flange, heavy series, with threads from M5 up to and including M20 and with property classes 8.8, 10.9 and A2-70.