Clear Hard Coat Anodizing

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Our capabilities at Automatic Anodizing include the ability to perform hard coat anodizing in accordance with MIL-A-8625 Type III specifications. The part highlighted here is a 6061 aluminum clamping pulley that is used by a customer in the medical industry. The pulley measures only 0.04″ square and required selective masking to protect the intricate part features during anodizing.

Prior to anodizing all parts were thoroughly cleaned to ensure that the aluminum surface would not contaminate the sulfuric acid bath. Proper cleaning and etching is essential to ensure the anodizing process is successful. During anodizing, the parts were placed on a titanium rack for maximum contact with the anodizing bath and allowed to develop a hard coating between 0.0004″ and 0.0007″, according to customer specifications. The anodized surface was sealed to provide maximum corrosion resistance.

This project included the anodizing of 20,000 parts with a one day turnaround and demonstrates not only our high volume processing capability, but our ability to meet rush order deadlines. We have a wealth of experience in developing custom solutions for anodizing complex parts to stringent quality standards. For additional details regarding this hard coat anodizing project, see the table below, or contact us directly.

Past Projects

Clear Hard Coat Anodizing of a 6061 Aluminum Component Project Details

Product Name

Clamping Pulley

Product Description

Clamping Pulley Pitch Grip for the Medical Industry

Capabilities Applied/Processes

Hard Coat Anodizing per MIL-8625, Type III

  • Cleaning
  • Rack
  • Etching
  • Sealing
Equipment Used to Manufacture Part

Rack Hard Coat Anodize System

  • Titanium Spine and Fingers
Overall Part Dimensions

.04″ X .04″

Tightest Tolerances

Thickness of 0.0004″ – 0.0007″

Material Used

6061 Aluminum

Material Finish

As Hard Coated

In Process Testing/Inspection Performed

Visual Inspection
Thickness / Coating Weight

Abrasion Resistance
Corrosion Resistance

Industry for Use




Delivery/Turnaround Time

1 Business Day

Delivery Location

Niles, IL

Standards Met

Customer Specifications