The International Standards Organization (ISO) creates standards for mechanical parts like nuts and bolts. Hexagon, or hex, flange bolts have six sides at the top with a flat flange underneath before the thread begins. Hex flange bolts have several applicable ISO standards depending on the type of bolt. Hex nuts can be used with hex bolts, but have separate ISO standards.
ISO Standard 4162
ISO standard 4162 covers hexagon flange bolts without a flange with threads from M5 to M16. Hex flange bolts under this standard include property classes 8.8 to 10.9 and A2-70. This standard sets the minimum and maximum dimensions for the screw and body of the hex flange bolt.
ISO Standard 15071
Hexagon bolts with flanges are covered by ISO standard 15071. This standard covers hex flange bolts with threads from M5 to M16. Hex flange bolts under this standard include property classes 8.8 to 10.9 and A2-70. This standard sets the minimum and maximum dimensions for the screw, head, body and flange of the hex flange bolt.
ISO standard 888
The general standard for bolts is ISO standard 888. Hex flange bolts made for different property classes or dimensions than those in ISO standards 4162 and 15071 should be made in accordance with ISO standard 888.
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