![]() This is our recommendation for Sherex-manufactured parts meant to meet Grade 5/Class 8 thread strength specifications. #RIVET NUTS ISO#Testing is for this is important, because different joint configurations will produce different clamp load levels.Īssembly torque is calculated as a ratio of proof load, which designates thread strength per SAE J995 for unified (UNC/UNF) internal thread sizes and ISO 898-2 for metric sizes. Sherex gives recommendations for the assembly torque to achieve recommended clamp load in our catalog to give the recommended torque for assembling a rivet nut joint using any Sherex-manufactured rivet nut. Failure torque recorded is the maximum torque reached before thread failure occurs. Torque is increased until the integrity of the joint fails, whether it be due to the bolt snapping inside the rivet nut or due to the threads of the rivet nut stripping. This is tested by assembling a test bolt into the flange side of the rivet nut, with the flange supported entirely by a hardened test plate. Torque the bolt on the flange side of the rivet nut until the bolt, rivet nut, or base material is compromised Sometimes this happens with the hole size is too big for the rivet nut or when the force applied to the joint is higher than anticipated, causing the rivet nut to pull right through the hole. Pull-out failure occurs when threads are pulled from the rivet nut (ultimate thread strength), or when the base material is distorted and the rivet nut (either partially or entirely) pulls through the base material. Here are some of the ways Sherex conducts rivet nut performance testing. It helps validate how the rivet nut will perform under an array of conditions to give manufactures and assemblers assurance that under that same kind of stress in their own design application, their joint will be able to hold up to any expected loading condition. Performance testing of rivet nuts is extremely important. While the material, coating, size, body style are all important, how the rivet nut performs under strenuous conditions is often times what matters the most. There are dozens of different styles of rivet nuts manufacturers can choose from when deciding on a fastening solution to help improve their assembly. ![]()
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