AMS 2485 Updated – Black Oxide Coating

AMS 2485, “Coating, Black Oxide,” has just been updated.  This is one of the most popular plating specs, used by companies around the world.  The new Revision L replaces AMS 2485K from 2008.  The spec has actually be in use since 1948.

This Aerospace Material Specification covers the black oxide coatings used on various parts.  This type of coating improves the anti-chafing and anti-friction properties of carbon and low-alloy steel parts.  This means that it is used for sliding or bearing surfaces.  It also provides a finish coat that can retain an oil film, important in many applications.

Sometimes the changes to these types of plating specs are fairly minor in nature.  Not so with the AMS 2485L.  While it was generated by a 5-year review of the specification, it still has a number of changes users will want to implement.

The first update is the Notice section.  This first introductory material covers ordering information — The information that the purchaser will want to provide to the plating processor.  The next section with updates is the one on the technical requirements.  Here clauses 3.1.2,, and have been revised.  Finally in Section 5 (Quality Assurance Provisions) clauses, 4.3.3, and 4.4.2 have been updated as well.

As you can see, the previous edition of AMS 2485 was stable for a number of years.  However the new changes in Revision L affect both plating facilities and the customers who use them.  So if you’re in either category, you’ll need a copy of this updated publication.

You can order any of the SAE AMS specifications at the Document Center Inc. webstore (  We’ve been an authorized distributor for SAE since the 1980’s.  Your ordering options online are for paper format delivery or pdf download.  Here’s the direct link to the AMS 2485 order page.

Document Center Inc. has been working with customers like you since 1982, so we have a number of services and products that can help you maintain your critical standards collection.  Please contact our staff to learn more about our free and premium notifications services, our enterprise solution Standards Online, or to ask questions that may have come up about any of the specs and standards you use.  Reach them by phone (650-591-7600) and email (  Remember, we’re your Standards Experts!


The Plating Spec Poster – A handy tool for plating and coating specialists

Techplate’s Plating and Anodizing Specifications Chart is a handy wall chart developed to summarize a variety of frequently referenced plating specs.

The 2006 Edition covers a wide variety of metals and coatings.  Various classes are covered, along with thicknesses, and applications.  It’s 18 inches wide by 24 inches high, so it’s easy to post and reference.

Here is a list of some of the coatings covered and specs that apply:

Anodic Coatings MIL-A-8625
Black Chromium Plating MIL-DTL-14538
Black Oxide Coating MIL-DTL-13924 and AMS-2485
Cadmium Plating AMS-2700 and ASTM-B766
Chemical Conversion Coatings MIL-DTL-5541
Chromium Plating AMS-2460
Chemical Finish Black MIL-F-495
Copper AMS-2418
Electroless Nickel Coatings AMS-2404 and AMS-C-26074
Electropolish ASTM-B912
Gold Plating ASTM-B488 and AMS-2422
Lubricant, Solid Film MIL-PRF-46010
Magnesium Anodic Treatment AMS-M-45202 and ASTM-D1732
Magnesium Chromic Treatment AMS-M-3171
Nickel Coatings AMS-QQ-N-290 and AMS-2403
Passivation Treatments AMS-2700
Light Phosphate Coating TT-C-490
Heavy Phosphate Coating MIL-DTL-16232
Salt Bath Nitride AMS-2753
Silver Plating ASTM-B700
Sulfamate Nickel MIL-P-27418
Tin Coatings ASTM-B545
Tin Lead Plating AMS-P-81728
Vacuum Cadmium Plating AMS-C-8837
Zinc ASTM-B633
Zinc Alloy Plating ASTM-B840 and ASTM-B841