Are 10.9 bolts brittle?
Could you elaborate on the context of your question regarding the brittleness of 10.9 bolts? Are you referring to a specific type of bolt used in engineering or construction? Generally, the brittleness of a bolt can depend on various factors such as its material composition, manufacturing process, and intended application. For example, some bolts may be designed to withstand high tensile stress without breaking, while others may be more prone to brittle fracture under certain conditions. It would be helpful to have more information about the specific bolt you're referring to in order to provide a more accurate answer.