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Message: <blockquote data-quote="V8Ranger" data-source="post: 64587" data-attributes="member: 202"><p>I'm not sure if your asking what a factor of safety is or how he got it but the factor of safety is obtained by dividing the ultimate stress (max stress that the part can withstand before failure) of the by the working stress (the stress that the part actually sees). For example a part that can hold 100 psi but sees only 20 psi has a factor of safety of 5.  He probably obtained the value from a bunch of analysis and calculations that can be very complicated and lengthy.  I'm not sure if that helped you out but your rather simple question has a pretty complicated answer with tons of variables (mounting positions, locations, design, etc). If your unsure and don't want to spend the time to figure out the loadings I'd probably just step up to the bigger size.</p></blockquote><p></p>