Coating · zinc
Zinc plated
Electroplated zinc with a passivation, to ISO 4042. A thin, bright and economical coating for mild conditions – and our standard finish for header plugs in carbon and alloy steel.
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What it is
How Zinc plated protects the joint.
01ElectroplatedZinc is deposited electrolytically, giving a thin, even layer.
02PassivationA conversion layer on top – clear/blue, iridescent or black – with hexavalent-chromium-free options.
03ThinThe layer fits within normal thread tolerances.
Applications
Where we use it.
01Header plugs in steelZinc plated plugs in A105, LF2, F11 and F22.
02Indoor and mild conditionsFasteners that are not exposed to severe corrosion.
03Economical setsStandard bolts, nuts and washers.
Layer thickness
Thickness, fit and threads.
Layer thickness
5 · 8 · 12µm
Common nominal thicknesses to ISO 4042. Thicker layers reduce thread clearance. For high-strength or hardened parts, ISO 4042 gives measures against hydrogen embrittlement.
| Nominal thickness | Note |
|---|---|
| 5 µm | Thinnest common layer |
| 8 µm | Common middle layer |
| 12 µm | More zinc, less thread clearance |
How it is applied
From bare steel to coated part.
01Clean and pickleDegreasing and activation.
02PlatingElectrolytic zinc deposition to the chosen thickness.
03PassivationConversion layer in the chosen colour.
04Baking (if needed)Hydrogen-embrittlement relief for high-strength parts, as agreed.
FAQ
Questions we get about Zinc plated.
- Is zinc plating suitable for 10.9 or 12.9?
- There is a risk of hydrogen embrittlement. ISO 4042 sets measures; often zinc flake (Geomet) is the safer choice.
- Which colour?
- Clear/blue is standard; iridescent and black are available.
- Why zinc plated for header plugs?
- It gives steel plugs a clean, protected surface for storage and assembly.
- Can it be thicker?
- Yes, but thicker layers reduce thread clearance – tell us the application.
Next step
Quote, compare or ask.
Reviewed October 2026 by HBS Solutions. Based on ISO 4042. Corrosion results always belong to a complete system (pretreatment, coating, thickness) – ask us for the data sheet of the system you order.
Other coatings
Compare with another coating.
TAKECOAT-1000Fluorocarbon polymer, 2 layersXylan 1070PTFE dry film, solvent-borneXylan 1424PTFE dry film, waterborneXylan 1427PTFE, extra corrosion protectionGeomet 500Zinc flake, integral lubricantHot-dip galvanizedISO 10684 · min 50 µm averageSherardizedZinc diffusion · ISO 17668All coatingsCompare them side by side
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