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BOLT TORQUE AND TENSIONING

When bolts are fastened to a device or structure, they require a certain amount of preload torque tension in order to properly support the final load.

Preload tension is the amount of tension applied to the bolt by a device like a torque wrench or spanner that tightens the bolt into place before the load it will eventually support is added (thus, preload). It is important to apply the correct amount of preload tension when fastening a bolt in order to meet the requirements of the specific bolt material and grade, the load it will carry, and many other aspects of the load.

If proper preload conditions aren’t met, a bolt may fail or a unit may become damaged because of the inadequate fastening. In order to properly fasten bolts, it is important to follow standards for torque tension. Ultrasprings has outlined a series of standards both for bolt sizes and torque tension on these bolts in relation to the substrate material. These outlines, meet international best practices and forms the basis for our professional service delivery on every project.

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