MIL-C-26074 Plating Specifications

MIL-C-26074 is an electroless nickel plating specification for applying precision coatings to a variety of shapes and sizes. When an engineering drawing calls out MIL-C-26074 nickel plating, the part needs a uniform, corrosion-resistant nickel-phosphorus coating that an electrolytic process cannot reliably deliver on complex geometry. These specifications are typically used within the aerospace, automotive, home electronics, oil & gas, as well as the medical industries. Common applications for the MIL-C-26074 (AMS 26074) specification are barrel plating, rack plating, and vibratory plating.

Accurate Precision Plating electroless nickel plates all mediums to meet MIL-C-26074 plating specification standards, and in all classes (class 1, 2, 3, and 4) and Grade A-C. The specification can cover requirements for electroless nickel coating on a variety of metal surfaces. Below is a description of each of these classes:

Grades

• Grade A should follow the grade of 0.0010 - inch minimum thickness.
• Grade B should follow the grade of 0.0005 - inch minimum thickness.
• Grade C should follow the grade of 0.0015 - inch minimum thickness.

The grade you specify is driven by the base metal. Grade A coatings are intended for aluminum-based alloys, Grade B coatings for copper, nickel, cobalt, titanium, and beryllium alloys, and Grade C coatings for iron-based alloys such as steel. Matching the correct grade to your substrate protects adhesion and ensures the finished part meets the MIL-C-26074 requirements.

MIL-C-26074 vs. AMS-C-26074

Engineers often see both callouts and assume they are different processes. They are not. AMS-C-26074 is the SAE-administered version of the same electroless nickel coating requirement, and it carries the identical class and grade structure. A part drawing that specifies AMS-C-26074 can be processed to the same controlled thickness, hardness, and adhesion targets as a drawing that specifies the military document. 

Because APP plates to all classes and grades, we meet either callout without requiring you to revise the print, which removes a common sourcing delay for procurement teams qualifying a new vendor.

Why Engineers Specify Electroless Nickel for Mil-Spec Parts

Because the coating is deposited chemically rather than through an applied current, it builds to a uniform thickness across threads, blind holes, internal bores, sharp edges, and recessed surfaces. That coverage is the core reason MIL-C-26074 nickel plating is trusted for components that have no margin for error in defense and aerospace service. 

The nickel-phosphorus deposit also delivers high hardness, strong wear and abrasion resistance, and corrosion protection that exceeds typical electrolytic nickel, which is why it appears on parts exposed to aggressive or hostile environments. For applications needing maximum corrosion performance, our high-phosphorus electroless nickel deposit offers 10 to 12 percent phosphorus content.

Qualified MIL-C-26074 and AMS-C-26074 Plating Services

Specifying a mil-spec coating is only useful if the supplier can prove compliance. Every job at APP is processed under an ISO 9001:2015 certified quality system, and coating thickness is verified using calibrated measurement equipment, so your parts ship production-ready and documented. We handle quantities from short prototype runs through full production, and we plate a wide range of base metals to meet the Class 1 through 4 and Grade A through C requirements your quality and compliance teams need to sign off on. 

Our broader electroless nickel plating capabilities, along with our other mil-spec plating services, let us support your full slate of finishing requirements from a single qualified source.

FAQs

Is MIL-C-26074 still an active specification?

The MIL-C-26074 military specification was cancelled, and new users are directed to its SAE successor, AMS-C-26074, with MIL-DTL-32119 reserved for specific naval nuclear propulsion program use. The requirement itself has not gone away. Drawings across aerospace, defense, and oil and gas still call out MIL-C-26074 by name, and the class and grade structure carries over unchanged to AMS-C-26074. Accurate Precision Plating processes parts to either callout, so a legacy MIL-C-26074 print does not need to be revised before you order.

Does MIL-C-26074 plating require a hydrogen embrittlement bake?

High-strength steel parts can absorb hydrogen during processing, which risks delayed brittle cracking under load. To prevent this, hardened steel components are given a post-plate baking treatment for hydrogen embrittlement relief. Under the specification this relief bake is not counted as the heat treatment that defines the coating class, so a Class 1 as-plated coating can still receive an embrittlement bake. Tell us your base metal and hardness when you request a quote and we will confirm whether your parts need the bake.

How is compliance with MIL-C-26074 verified?

Compliance is confirmed through defined testing rather than visual inspection alone. Coating thickness is measured with methods such as X-ray and cross-sectional analysis, salt spray exposure confirms corrosion resistance, and bend, impact, or pull-off tests verify adhesion. At Accurate Precision Plating every job runs under an ISO 9001:2015 certified quality system, and we provide the inspection results and certifications your quality and compliance team needs to approve the lot.

Request A Quote Today!

If you have any questions about our MIL-C-26074 standards or need any more information on our capabilities, please feel free to contact us today or call at (281) 598-8835!

Contact Accurate Precision Plating
click to request a quote or call us at 866.598.8063