Thanks, we need more DIY methods for quantitative evaluation of fasteners and joints, e.g. replication of this deck screw strength test, https://www.youtube.com/watch?v=eikOUFoIZ-Y
> Bolt Science was founded in 1992 with the intention of becoming the recognised worldwide quality provider of independent technical expertise in bolted joint technology. Our clients include many of the major engineering organizations of the world. We provide analytical, testing, and technical problem solving services. We can help you understand the issues regarding the structural integrity of bolted joints and provide engineering solutions based upon our considerable experience in this field.
The spax screws have all the information given in this video available on their website because they are a German product and EU law (mostly) requires a data sheet for construction products called a ‘Declaration of conformance’. I’m not sure about the other ones.
https://www.boltscience.com/pages/aboutus.htm
> Bolt Science was founded in 1992 with the intention of becoming the recognised worldwide quality provider of independent technical expertise in bolted joint technology. Our clients include many of the major engineering organizations of the world. We provide analytical, testing, and technical problem solving services. We can help you understand the issues regarding the structural integrity of bolted joints and provide engineering solutions based upon our considerable experience in this field.