PREMIUM FASTERNER QUALITY : COATING THICKNESS VS COATING PERFORMANCE
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Coated fasteners for heavy industrial use are usually coated for a very good purpose. This is due to the harsh environment in which these nuts and bolts are required to perform.
They are often used underwater, underground, or regularly exposed to water in various industrial sectors such as oil and gas, construction, and utilities. When it comes to coating performance, a common misconception in the industry is that the thicker the better.
This is far from being true as when the coating thickness is relatively high - this can cause assembly problems, particularly for screwed fasteners with internal drive.
A thicker coating may improve its corrosion resistance capabilities, but the excessive layer would stress the fastener, leading to cracking and delamination and will influence the fastener lifetime, appearance, and performance.
Read more here:
www.engineering-edge.com/blog/premium-fastener-quality-thickness-performance.aspx
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