Torque and Tension Relationship

by | Jul 31, 2020 | Blog Posts, Torque and Tension Relationship

The torque and tension relationship is important.  Peak innovations Engineering performs various types of tests for our clients including helping them to determine the torque and tension relationship of products.  Torque is the product of the magnitude of the force and the perpendicular distance of the line of action of a force from the axis of rotation. Bolt tension compresses the joint components, creating a clamping force in the joint.  Bolt tension and clamp force are what keeps joints tight.  When external forces exceed the clamping force, the fastener tends to rotate causing a reduction in clamp force. As clamp force is lost, a less external force is required to loosen the joint.  When all of the clamping force is lost, the fastener becomes free spinning.

The torque and tension relationship is key in regards to joint design.  Determining the bolt tension and clamp loads is required so they exceed the external forces the joint will experience in its service life.  The torque and tension relationship is also very important in regards to appropriate loads and safety margins and to determine the torque required to achieve the desired clamp loads, failure torque, and mode of failure.  Selecting an assembly tool that is capable of achieving the desired assembly torque within the ranges of minimum to maximum bolt tension, providing operator training in regards to torque and tension, and minimizing other sources of variation including surface conditions, the introduction of lubricants, tool wear, etc. are all important factors to consider in this process.


Company Profile:
Peak Innovations Engineering has a highly technical team to design, test, validate, and enhance the bolted joints within your product application. Joint development and testing are all we do, so we do it better than other available options, both internal and external. Why consume your resources engineering and problem-solving areas that are secondary to your core responsibilities when we can take care of them quickly, definitively, and cost-effectively? www.pieng.com

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