Zinc Plating & Galvanizing — Clear, Yellow, Blue

What it is and when to specify it

Zinc plating is an electroplating process that deposits a thin layer of zinc onto steel to protect it from corrosion. The zinc corrodes first, acting as a sacrificial layer, so the steel underneath stays intact. It is the most common corrosion finish for steel fasteners and brackets.

Specify zinc plating whenever a carbon or alloy steel part will face moisture, humidity, or light outdoor exposure. It suits steel bolts, nuts, screws, brackets, and machined components where rust protection matters more than a bright cosmetic layer. Where the finish needs extra corrosion resistance, a zinc chromate coating is added as a passivate.

Zinc plating specifications

The finish is defined by color and plating thickness, both confirmed per order against your drawing.

• Color: clear (silver/blue), yellow, and blue are the standard options; the passivate after plating sets the shade.
• Materials: carbon steel and alloy steel are the typical substrate.
• Thickness: plating thickness is confirmed against the drawing, not assumed, because it affects thread fit.

Zinc plating on steel is the same family of protection as galvanizing steel, but at a thinner, more controlled layer suited to machined parts with threads and close fits. The galvanized steel process of electroplating builds that even layer directly onto the part.

Which materials and parts it suits

Zinc plating is the workhorse finish for steel components.

• Steel machined parts — zinc plated bolts, nuts, washers, and brackets.
• Custom screws, bolts, nuts, and washers where the coating must not disturb thread fits.
• Brackets and spacers and standoffs for equipment and enclosure hardware.

Finishing is applied through our vetted partner network, managed under one quality process. Every order ships with a material certificate and pre-shipment photos. Orders start at 50 pieces per style and material, with samples in 5–10 days and production in 25–35 days.

Corrosion, wear and dimensional impact

Zinc plating provides solid corrosion resistance by sacrificing itself before the steel can rust. The galvanized zinc layer keeps working even where the surface is scratched, which is its main advantage over paint.

The trade-off is thickness. Plating adds material to threads and close-fit bores, so we plan the allowance. Threads may be masked or sized to accommodate the deposit, and we confirm the plating thickness before machining so the finished part still meets ±0.01 mm on critical features and ISO 2768-m elsewhere. We review the dimensional impact with the finisher so there are no surprises at shipment.