Delta Tone Disc Springs (Belleville Washers) are high-performance conical spring washers coated with an inorganic zinc-flake surface treatment to provide exceptional corrosion resistance without risking structural failure. In heavy-duty mechanical engineering, managing immense axial loads in tight spaces is a standard requirement. However, introducing high-stress components to harsh environments frequently leads to a compromise between strength and environmental degradation. This specialized combination addresses that exact vulnerability.

To understand why Delta Tone is so highly regarded, it helps to look at the unique manufacturing trap it avoids. Standard high-strength carbon steel or chrome vanadium disc springs are highly susceptible to hydrogen embrittlement. When these springs undergo traditional electroplating, hydrogen gas can be absorbed into the steel structure, making it dangerously brittle and prone to sudden, catastrophic cracking under load.

Delta Tone circumvents this danger entirely. Applied as an inorganic coating made up of carefully blended aluminium and zinc compounds, it is baked directly onto the surface. Because the application is non-electrolytic, there is zero risk of hydrogen absorption. The baking process cures the material into a bright silver, highly flexible barrier that bends and flexes naturally with the extreme deflection of the spring without chipping or peeling.

When combined with an organic topcoat like Delta Seal, this pairing delivers a massive boost in longevity. In industrial salt spray and stress corrosion cracking tests, Delta Tone-treated parts regularly withstand hundreds of hours of exposure far better than standard oiled or mechanically zinc-plated alternatives. Furthermore, it creates a crucial bimetallic barrier that prevents galvanic corrosion when the steel spring is compressed directly against aluminium components.

For modern engineering teams focused on sustainability, Delta Tone offers an additional compliance advantage. The formulation is completely free of heavy metals—such as hexavalent chromium, cadmium, or lead—ensuring total alignment with strict global environmental standards like RoHS and ELV directives.

Whether utilized in high-vibration automotive subassemblies, industrial valves, or heavy manufacturing machinery, opting for Delta Tone disc springs guarantees that your critical components retain their exact force-deflection characteristics without yielding to rust or micro-cracking. It represents a highly cost-effective insurance policy for demanding hardware operating in unpredictable environments.

Please contact us today for a free quotation for our Delta-Tone Disc Springs.