M20x55 Csk Socket Head Zinc Plated (Pack Of 1)
Part No: M20-055CSH-Z
Excl VAT: £0.71
M20x55 Csk Socket Screws Zinc Plated (Pack of 25) [Grade 10.9]
Part No: FM20-055CSH-Z
Excl VAT: £21.38
Zinc coatings prevent oxidation of the protected metal to create a longer lasting finish. It does this by forming a barrier and by acting as a sacrificial anode if this barrier is damaged. Zinc oxide is a fine white dust that (in contrast to iron oxide) does not trigger a breakdown of the substrates surface integrity as it is formed. The zinc oxide, if left intact, can act as a barrier to further oxidation, in a way similar to the protection afforded to aluminum and stainless steels by their oxide layers.