BS 4320 is a British Standard that specifies the requirements for hexagon bolts, screws, and nuts with coarse pitch thread, manufactured from unalloyed or alloy steel. The standard covers a range of diameters from 5 mm to 39 mm, with various lengths and property classes. The property classes are classified based on the mechanical properties, such as tensile strength, yield strength, and elongation. The standard also outlines the testing and inspection methods to ensure the products meet the specified requirements.

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