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DIN6921– M12x25– 10.9 Flange Head Screws alloy steel Zinc plate
This International Standard specifies the characteristics of flange hexagon bolts ,with product grade A, with threads from M5 up to and including M16,length from 10mm to 200mm,and property classes 8.8, 9.8, 10.9 and A2-70,A4-70.
Flange head screws includes two kinds of serrated and smooth plane.
Flange surface increases the contact area, flange head screws tightened, there is a certain anti loose function.
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EXAMPLE
A hexagon bolt with flange, small product grade A, with thread M12,nominal length l = 80 mm, and property class 10.9 is designated as follows:
Flange Head Screws DIN6921( ISO4162 )– M12x80 – 10.9
