---
title: "US Military & Aerospace Specifications — Reference Library"
description: >-
  US Department of Defense and aerospace-industry specifications for aluminium anodizing. Used internationally for defence components, aerospace structural parts,
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last_modified: 2026-05-24
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**Sources in this category:** 3. Listed in order of standard precedence (formal standards first, then textbooks, then research papers, then industry resources), then by year (newest first).

Standard · 2020

AMS 2469 — Hard Anodic Coating Processing and Performance Requirements

SAE International (Aerospace Material Specification)

SAE Aerospace Material Specification for hard anodic coatings on aluminium and aluminium alloys (also known as Type III hard anodize). Specifies processing parameters, coating thickness ranges (typically 25-75 μm), hardness requirements, and dimensional tolerance allowances for aerospace applications. Frequently referenced jointly with MIL-A-8625F Type III but with tighter performance bands for aerospace use.

[View source →](https://www.sae.org/standards/content/ams2469/) · [Details](/reference/ams-2469)

Access: Paywalled; available via SAE Mobilus subscription or one-time purchase

hard-anodizeanodize-type-iiiaerospacehardnesscoating-thicknessmil-spec-compliance

Standard · 2006

MIL-DTL-5541 — Chemical Conversion Coatings on Aluminum and Aluminum Alloys

US Department of Defense

US military detail specification for chromate and non-chromate chemical conversion coatings on aluminium — the conversion coating equivalent of anodize for applications requiring electrical conductivity (e.g. RF grounding, antenna housings) where anodize's insulating film is incompatible. Defines Class 1A (full corrosion protection) and Class 3 (electrical conductivity-preserving) coatings. Increasingly important as the industry moves from hexavalent chromate to trivalent chromium and non-chrome alternatives.

[View source →](https://quicksearch.dla.mil/qsSearch.aspx?qsSearchTerms=MIL-DTL-5541) · [Details](/reference/mil-dtl-5541)

Access: Free download via DLA ASSIST portal

conversion-coatingchromatetrivalent-chromiumelectrical-conductivitymil-spec-compliancealternative-to-anodize

Standard · 2003

MIL-A-8625F — Anodic Coatings for Aluminum and Aluminum Alloys

US Department of Defense

The canonical US military specification for anodic coatings on aluminium. Defines Type I (Chromic Acid Anodize), Type II (Sulphuric Acid Anodize), and Type III (Hard Anodize) chemistries, plus Class 1 (non-dyed) and Class 2 (dyed) finishes. Specifies coating-weight requirements, thickness ranges, salt-spray performance (per ASTM B117), and stripping tests. The reference specification cited internationally for defence, aerospace, and high-reliability industrial anodizing — including by Indian fabricators supplying defence OEMs. Revision F with Notice 1 is the current version.

[View source →](https://quicksearch.dla.mil/qsSearch.aspx?qsSearchTerms=MIL-A-8625) · [Details](/reference/mil-a-8625-rev-f)

Access: Free download via DLA ASSIST portal

anodize-type-ianodize-type-iianodize-type-iiihard-anodizechromic-acid-anodizesulphuric-acid-anodize