What is the meaning of the M4.6 grade bolt – Cazzon

The first digit relates to the ultimate strength of the material, whilst the second is the ratio of yield stress to ultimate strength. Thus grade 4.6 bolts have an ultimate material strength of 400N/mm2 and the yield (or proof) stress is 60% of the ultimate strength.

What is black’bolts?

4.6 grade bolts without corrosion protection are commonly called ‘black bolts

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