ZNiBolt

Zinc-nickel plating for fasteners

Alkaline zinc-nickel alloy plated on our own line in Ningbo. Barrel plating for standard bolts, nuts and screws; rack plating for large or delicate parts.

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Automatic zinc-nickel plating line with overhead hoist in Ningbo

Our salt-spray results

CoatingThicknessNeutral salt spray
Zinc-nickel12 µm1,000 h (neutral salt spray to first red rust)
Zinc-nickel15 µm1,440 h (neutral salt spray to first red rust)

From our own production records. Reports can be supplied with orders.

How the finishes compare

FinishTypical thicknessThread fitBest forApplied
Zinc-nickel8–15 µmStandardAutomotive, high corrosion with tight threadsOur own line
Zinc5–12 µmStandardIndoor and general useOur own line
Hot-dip galvanized50 µm+Nuts tapped oversizeOutdoor steel structures, M10 and upAvailable
Zinc flake8–12 µmStandard10.9 / 12.9 bolts (no hydrogen embrittlement)Available
Mechanical galvanizingPer ASTM B695 classStandardHigh-strength parts, washersAvailable

Zinc-nickel vs zinc plating, explained · HDG vs zinc-nickel vs Dacromet

Zinc-nickel plated parts we supply

Hex boltsFlange boltsSocket head screwsHex nutsFlange nutsLock nutsWashersThreaded rodStud boltsWheel bolts & nuts

Zinc-nickel plating FAQ

How long does zinc-nickel plating last in salt spray?
On our line, 12 µm zinc-nickel reaches 1,000 h and 15 µm zinc-nickel reaches 1,440 h in neutral salt spray before first red rust. Results depend on thickness, passivation and part geometry, so we quote hours together with thickness.
Is zinc-nickel safe for 10.9 and 12.9 bolts?
Electroplating can cause hydrogen embrittlement in high-strength steel. For class 10.9 and above, baking after plating is required, or a zinc flake coating can be chosen instead. Agree the method at order stage.
Zinc-nickel or hot-dip galvanizing?
HDG builds a much thicker coating (typically 50 µm or more) for outdoor structural steel, but needs oversize-tapped nuts and is not suitable for fine threads. Zinc-nickel is thin and uniform, keeps thread fit, and is common in automotive parts.
Which passivation colours are available?
Clear / iridescent, Black, Optional top coat / sealer.
Can you plate parts we supply?
Yes. Send part drawings, material and quantity, and the coating specification you need.

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