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Aluminum Anodizing

We meet tight tolerances using precision control systems to achieve accurate coating thickness of aluminum anodized parts. Our services include (MIL-A-8265) Type II and III, Class 1 and 2 at our state-of-the-art facility in Minnesota.

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Type II Anodizing

The most common aluminum anodizing creates a coating thickness of up to 1mil. We seal dyed components, which increases corrosion resistance and reduces fading.

Benefits of Type II Anodizing

  • Corrosion resistance
  • Dielectric properties
  • Aesthetics
  • Better bonding
  • Non-contaminating (for medical instrumentation, etc.)



Type III Hard Coat Anodizing

Our Type III hard coat anodized aluminum results in a coating up to 2 mils thick for greater durability. We meet tight tolerances for hard coat anodizing using our unique control systems to achieve accurate coating thickness of aluminum anodized parts. Our services include dying options.

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Anodize Chess PCS
Purple Anodize

Post-Anodizing Dying

We apply colored dyes after aluminum anodizing. The parts undergo sealing to reduce color fading.

Colors shown are for general reference only. Other colors may be available upon request.


Aluminum anodizing is a controlled electrochemical process that increases the thickness of the oxide layers that naturally exist on aluminum surfaces, improving corrosion resistance.

Arrow Cryogenics offers standard (MIL-PRF-8625 Type II) aluminum anodizing at our state-of-the-art facility in Blaine, Minnesota. We also provide hard coat anodizing (MIL-PRF-8625 Type III).

Type II aluminum anodizing is used for a wide range of applications ranging from computers to aerospace and has several advantages, including:

  • Corrosion resistance
  • Dielectric properties
  • Aesthetics
  • Better bonding
  • Non-contaminating (medical instrumentation, etc.)
  • Type II Aluminum Anodizing Service standard anodized aluminum has a coating up to 1 mil thick and is sealed to seal in the dye and close the pores after the anodizing process for improved corrosion resistance. It is the most common form of aluminum anodizing and is available in dyed and non-dyed options.
  • Type III Aluminum Anodizing Service Hard Coat Anodized Aluminum is a thicker, more durable coating up to 2 mils thick. It is also available in non-dyed and dyed options. For the best wear resistance and when adhesion is required on a non-dyed component, it is typically not sealed.

When anodizing aluminum parts with tight dimensions, it is important to understand that the coating will affect the final dimensions. In general, 50% of an anodized coating will penetrate the material’s surface, and 50% of the coating builds up on the surface. But, the change in final dimensions is determined by the thickness of the coating.

Class I coatings have a mil thickness of 0.7 (18 microns) or greater for aluminum anodizing. Class II coatings have a minimum mil thickness of 0.4 (10 microns). Class I coating is a high-performance anodic finish used primarily for exterior building products and other products that must withstand continuous outdoor exposure.

Arrow offers aluminum anodizing in these popular colors:

  • Blue
  • Green
  • Purple
  • Gold
  • Orange
  • Olive drab green
  • Red
  • Gray
  • Black

We can produce custom colors upon request.


AC7108 REV I – NADCAP Audit Criteria for Chemical Processing

  • AC7108 Anodize; Hard Anodize and Sulfuric Anodize (Not for Metal Bond) – AC7108/8 must also be selected
  • AC7108 Chromate (non-hexavalent)
  • AC7108 Passivation
  • AC7108 Electropolish
  • AC7108 Standalone Cleaning
  • AC7108 Descaling
  • AC7108 Solution Analysis & Testing – AC7108/4 must also be selected
  • General Cleaning & Pre-Cleaning
  • Alkaline Cleaning
  • Chemical Cleaning
  • Titanium Cleaning
  • Emulsion Cleaning
  • Semi-Aqueous Cleaning
  • Solvent Cleaning
  • Ovens for Thermal Treatments – Heat Processing; Part Dying
  • Stripping of Coatings
  • Inorganic Coatings
  • Other Stripping

AC7108/4 REV C – NADCAP Audit Criteria for Solution Analysis and Testing in Support of Chemical Processing to AC7108

  • Solution Analysis (In Support of AC7108)
  • Testing Performed Internally (In Support of the Chemical Process Accreditation)
  • B05 – Salt Spray Testing (In Support of Chemical Process Accreditation)
  • B06 – Water Immersion / Humidity Testing (In Support of AC7108)
  • B09 – Taber Wear Testing (In Support of AC7108)
  • B10 – Adhesion Testing (In Support of AC7108)
  • B13 – Coating Weight Testing(In Support of AC7108)
  • B 14 – Conductivity Testing (In Support of AC7108)
  • B15 – Resistivity Testing (In Support of AC7108)
  • B16 – Coating Thickness Measurement (In Support of AC7108)
  • B23 – Other Testing (In Support of AC7108)

AC7108/8 – NADCAP Audit Criteria for Anodizing (Not for Metal Bond)

  • Anodized Aluminum, Hard Anodize
  • Anodize Aluminum, Sulfuric Acid
  • Dye
  • Seal

AC7108/11 – NADCAP Audit Criteria for Conversion Coating

  • Aluminum, Non-Hexavalent Chrome Alternatives

AC7108/12 REV A – NADCAP Audit Criteria for Standalone Cleaning, Descaling, Passivation, and Electropolishing

  • Passivation
  • Nickle Acetate
  • Nickle fluoride
  • Hot Water


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We look beyond today to increase efficiency and serve your business.

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Learn about Medical

We finish your materials within tight tolerances to meet exacting quality and regulatory demands.

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Learn about Military

Defense contractors rely on our anodizing, laser-marking, descaling, and other services to meet military specifications.

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Learn about Aerospace

We offer a range of finishing services for aerospace components and maintain NADCAP certification


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CNC manufacturers rely on our services to complete final finishing.

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We innovate processes in the science and art of finishing precision-engineered pharmaceutical components.

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Water Purification

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Our services for finishing water-system components include cryogenic deflashing, passivation, and laser marking.

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Our precision capabilities handle high-volume jobs for automotive OEMs.

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Learn about Computing

We offer anodizing and laser marking of components and enclosures for computers and audio equipment.

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Our finishing services meet critical tolerances for metal and plastic parts made for consumer electronics.

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Food Service

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Our cleaning and finishing services meet strict regulatory requirements while enhancing performance and longevity.

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Learn about Hydraulics

Our deburring, deflashing, and other services optimize the operating life of hydraulic equipment.

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Learn about Firearms

Our suite of capabilities delivers precise results producing the highest quality finishes.

NADCAP Certified

Regular Nadcap reviews and audits ensure compliance with AC7004 requirements for the aircraft, space, and defense industries.

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MPMA - Minnesota Precision Manufacturing Association
Nadcap Administered by PRI Accredited
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Our Certifications About Industries


Finished Means Finished. Done

We eliminate the need for your parts to go elsewhere.

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