Cup Square Hex Bolts (sometimes referred to as coach bolts ... although this can be confusing as there are other types of coach bolt!) - are bolts with a mushroom shaped head generally used in timber construction.
They come with a nut which is used to tighten the bolt against the material.
Standards: DIN 603; DIN 555
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A general purpose stainless steel which strikes a good balance between corrosion-resistance and cost.