Primer-Free® inserts are designed for use in applications where galvanic corrosion between dissimilar metals is a concern. The proprietary Primer-Free® coating not only protects the base material and provides excellent lubricity, but more importantly, eliminates the need for liquid chromate primers. With Primer-Free® coated inserts, the inserts are always evenly coated, providing more accurate bolt torques. When utilizing Primer-Free® inserts, installation time is reduced significantly and total in-place cost is decreased dramatically.
Fast Facts:
  • Contains no Hexavalent chromium
  • Eliminates need for chromate primers
  • Provides added lubricity for easier installation
  • No additional hole preparation necessary
  • Ideal for aluminum & magnesium applications
  • Meets Aerospace Standards
heli-coil primer free coated insert installed cost comparison chart

The chart above illustrates the significant difference in installed cost when comparing Primer-Free®  inserts with inserts coated with liquid chromate primer. Significant savings - in excess of 20% - can be achieved when utilizing Primer-Free®  inserts. These savings are largely due to the elimination of the application of the liquid chromate primer, which is a labor-intensive process and often results in inconsistent coverage of the threads.

heli-coil primer free coated inserts corrosion resistance comparison chart

Primer-Free®  inserts have undergone extensive salt fog testing per ASTM B-117. After exposure, the samples were sectioned to expose the threaded insert for examination. When protecting against galvanic corrosion, Primer-Free®  inserts did consistently meet or exceed the performance of insert assemblies containing liquid chromate primer.

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The availability of the products described on this site, and the product descriptions, may vary from country to country. Consult your STANLEY® Engineered Fastening Account Executive or your local distributor for specific product information.