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Armoloy Specifications

AMS QQ-N-290D

Electrodeposited Nickel Plating Specification

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Armoloy Specifications

What is AMS QQ-N-290D?

AMS QQ-N-290D is a U.S. military specification (formerly known as QQ-N-290) that outlines the requirements for electrodeposited nickel coatings on metallic substrates. Originally developed as Federal Specification QQ-N-290, it was later adopted by SAE International and reissued under the AMS (Aerospace Material Specification) system to meet aerospace, defense, and high-performance manufacturing needs.

This standard provides strict guidelines on:

  • Coating classes (by thickness)
  • Types (based on undercoating)
  • Service conditions
  • Adhesion and appearance
  • Hydrogen embrittlement relief (baking)

AMS QQ-N-290D ensures that nickel plating is uniform, adherent, corrosion-resistant, and suited for functional or decorative applications.

Note

As of recent updates, QQ-N-290 has been largely superseded by other standards (such as ASTM B689 and AMS 2403) for new design work. However, AMS QQ-N-290D is still widely cited on military, aerospace, and legacy prints, making it important for compliance in ongoing production and MRO (maintenance, repair, overhaul).

nickel plating on machined parts for ams qq-n-290d

The Role of AMS QQ-N-290D in Nickel Plating

AMS QQ-N-290D defines requirements for electroplated nickel, which provides:

  • Corrosion resistance
  • Wear protection
  • Enhanced solderability
  • Improved aesthetics

It is often used in combination with copper or other undercoats, depending on the substrate and performance demands.

Key Functional Areas:

  • Barrier Layer: Prevents diffusion of substrate elements into final coatings.
  • Engineering Surface: Used for dimensional buildup, wear surfaces, or brazing prep.
  • Decorative Finish: Enhances brightness and polish on consumer or aerospace parts.
AMS 2403 and ams qq-n-290d electrodeposited nickel plating on motorcycle exhaust

AMS QQ-N-290D Classifications

Classes (By Thickness)

  • Class 1: 0.0016 inch (1.6 mils)
  • Class 2: 0.0012 inch (1.2 mils)
  • Class 3: 0.001 inch (1.0 mil)
  • Class 4: 0.0008 inch (0.8 mil)
  • Class 5: 0.0005 inch (0.5 mil)
  • Class 6: 0.0003 inch (0.3 mil)
  • Class 7: 0.0002 inch (0.2 mil)
  • Class 8: 0.0001 inch (0.1 mil)

These classes are chosen based on the part’s end use, corrosion exposure, or tolerance allowances.

Types (Based on Undercoating):

  • Class I: Nickel only
  • Class II: Nickel over copper (for enhanced ductility or under soft substrates)
  • Class III: Nickel over copper plus bright nickel (common in decorative or dual-function finishes)

Testing and Quality Assurance

AMS QQ-N-290D specifies multiple quality checks to ensure plating integrity:

Adhesion Tests: Tape test, bend test, or thermal shock

Thickness Verification: Using magnetic gauges (ASTM B499), X-ray (ASTM B568), or coulometric methods

Hydrogen Embrittlement Relief: Mandatory baking for high-strength steels (per AMS2759/9)

Corrosion Resistance: Must pass neutral salt spray test (ASTM B117), particularly for parts with higher class ratings or outdoor use

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Industries That Use AMS QQ-N-290D

  • Aerospace: Hardware, engine parts, fasteners, and housings often require QQ-N-290D-compliant nickel to meet OEM and FAA standards.
  • Defense: Legacy systems and MIL-SPEC drawings frequently call out QQ-N-290D for plating, especially in high-reliability components.
  • Medical Devices: Non-reactive nickel finishes used on surgical or diagnostic equipment, sometimes over copper or stainless steel.
  • Electronics: Enhances the longevity and performance of molds, dies, and other precision tools.
  • Industrial Components: Rollers, shafts, and bearing surfaces plated with nickel for wear and corrosion resistance in harsh environments.
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Benefits of Working with an AMS QQ-N-290D Provider

Legacy specification expertise

Many aerospace and defense parts still call out AMS QQ-N-290D. Working with a compliant provider ensures you meet drawing and contract requirements without costly deviations

Dimensional precision

Nickel plating must meet strict tolerances. AMS QQ-N-290D providers are equipped to deposit and verify thickness to the micron level

Process control & documentation

Providers certified to AMS QQ-N-290D typically follow NADCAP, ISO 9001, or AS9100 quality systems for repeatability, traceability, and audit readiness

Post-plating deat treatment

Includes hydrogen embrittlement relief for high-strength steel parts in accordance with AMS2759/9 standards

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Specifications at Armoloy

Armoloy offers plating solutions that meet AMS QQ-N-290D to support both regulatory compliance and individual project needs. Explore common specifications and accreditations we work with, and contact us to find the right solution for your application.

 

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Disclaimer

The information provided on this page, including any descriptions, interpretations, or summaries related to AMS QQ-N-290D, is offered solely by The Armoloy Corporation for general informational purposes. This content reflects Armoloy’s internal understanding and practical application of AMS QQ-N-290D within its own processes and does not constitute official or authorized guidance from SAE International.

AMS QQ-N-290D is a proprietary specification developed and owned by SAE International. Armoloy makes no claim to ownership of this specification and does not reproduce, quote, or distribute any protected content from the original document. References to AMS QQ-N-290D are made in accordance with fair use principles and are intended to illustrate Armoloy’s alignment with recognized standards for electroplated nickel coatings.

This content is not intended to substitute for the official specification, which should be obtained directly from SAE International. Readers are strongly encouraged to consult the original standard and qualified professionals for definitive technical or compliance information.

The Armoloy Corporation makes no warranties, express or implied, regarding the accuracy, completeness, or applicability of this content and disclaims all liability for any reliance placed upon it. This disclaimer is subject to change without notice and does not create any contractual relationship or obligation.