Proof Load Of A Bolt
Since many technical data sheets associated with bolts and nuts frequently use the terms of tensile proof load many of the customers are willing to find out what they are or at least have a superficial understanding of these terms. In most applications if the bolt has been tightened past its yield strength it is no longer reusable and will have to be thrown away if loosened.
The preferred bolt preload for structural applications should be at least 75 of the fasteners proof load for the higher strength fasteners and as high as 90 of the proof load for permanent fasteners.
Proof load of a bolt. A material must remain in its elastic region when loaded up to its proof load typically between 85 95 of the yield strength. Us bolts coarse threads proof load. Proof load is the maximum tensile force that can be applied to a bolt that will not result in plastic deformation. Clamp load equals to 75 of proof load. Where d equals nominal diameter in in. And n equals thread per inch. Proof loads for screws iso metric fine threads iso 898i 1988. Proof load is the limit of the elastic range of the bolt. Proof load is defined as the maximum tensile force that can be applied to a bolt that will not result in plastic deformation. In other words the material must remain in its elastic region when loaded up to its proof load. Proof load is defined as the maximum tensile force that can be applied to a bolt that will not result in plastic deformation. To achieve the benefits of the preloading the clamping force must be higher than the joint separation load. Proof load and tensile of bolt and nut. Proof loads and tensile strengths are computed by multiplying the proof load stresses and tensile strengths stresses by the stress area of the thread. As 07854 d 09743n squared.
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