This ability to stretch and release is called elasticity. If you loosen the nut, the bolt relaxes and returns to its normal length the same way a spring returns to its original shape when you release it. As you increase the tension, the bolt stretches the way a spring would stretch when you pull against both ends. By tightening the nut, you are creating tension, a load or force that pulls on both ends of the bolt. Think of the bolt in a bolted joint as a stiff, metal spring. This means that when they are tightened in a bolted joint, they actually stretch a tiny amount. In this article, we will explain in simple terms the meaning of proof load and why it’s important to know the proof load when specifying the tension for a steel bolt.Įven though bolts may seem perfectly rigid, steel is an elasticmaterial. Your SmartBolts shipment has arrived, along with a Certificate of Compliance, which lists your SmartBolt specifications including bolt dimensions, grade and finish, as well as proof load, and other important information.
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March 2023
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