The proof strength of the nut (the material containing the internal thread) In order to determine the torque value of a bolt and nut assembly based on just the material strength of the bolt itself, the materials of the assembly should follow this guideline. Material containing the internal thread (nut).Although material properties vary, an approximate estimate of proof strength is 85% - 90% of its yield strength.Īs noted in the chart, bolt proof strength varies depending on the fastener grade and also upon its diameter in some cases. at 75% of the material proof strength.īolt proof load is defined as the maximum force that the material can support without experiencing permanent deformation. This RepairEngineering bolt torque chart was created assuming a value at the mid-point of that range. Reference 2 below recommends a fastener preload in the range of 60% - 90% of the bolt material proof load. Most bolt torque charts, including this one, are based on the material strength of the bolt - the component containing the external thread. Material containing the external thread (bolt).There are several factors that determine a proper bolt torque specification.
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