For Heavy Bolted Sections
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• Electrical Applications
• Bus Bar Joints • Transformers • Automotive • Farm Implements 
Diameter in Inches 'D'
This series of Belleville springs has been specifically designed for heavy bolted sections such as those used in electrical industries - on bus bar applications, transformers, etc. They are widely used to compensate for bolted sections. These conical spring washers are not as accurately formed as our AI series, which are generally used for lighter loads and more predictable load/deflection characteristics. SP Belleville Springs are made of high-quality spring steel, heat treated to Rockwell 43-50, and are available with mechanical zinc plating.
Typical application
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Important Note: SP Series Belleville Springs are not pre-stressed. They are designed for static bolted applications only. Consult factory for other uses. 
Our Belleville Springs are warranted for a period of one year from initial delivery to be free of material defects and or faulty workmanship. The limit of our liability in all cases is the free replacement of defective parts to be supplied as required. Bulk package FOB Factory. In no case are claims for consequential damages permitted since we cannot control misapplication of our springs or their use in inappropriate environments. AI pre-stressed disc springs are used to maintain load or tension in bolted assemblies. Pressure begins at the outer radius and flattens gradually toward the bolt as deflection progresses. Disc springs exert a uniform pressure that remains constant despite tension losses caused by thermal expansion and contraction, compression set or wear of parts. Because pressures are predictable, disc springs provide a simple and effective means of determining bolt tension that is far more accurate than "torque" readings.
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