Originally Posted by
daleburr
Are you aware that SS screws are less than half as strong as the 12.9 high tensile screws included with the TC6? I wouldn't use them for anything load bearing. Actually I wouldn't use them at all; they're just as heavy but more prone to bend and have the heads strip.
12.9 Yield Strength = 1100
SS Yield Strength = 520
Personally I would not bet that those heat treat specs and strengths are anything certain coming out of China. 2nd, if you use the kit screws in the chassis plate you will have dificulty removing tweak as the chassis will rock on the protruding bolt heads. What can happen with with carbon steel screws that will not with stainless is the heads will sheer off far easier (more brittle) instead of just bend, making fixing the issue a can of worms. Also, not sure where you get your numbers from but they are not 2x as strong. From nuts and bolts.com
A common question is whether stainless steel is stronger that a grade 5 or grade 8 bolt. Stainless commonly comes in grades 18.8 (304) or T316. Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.
Also it depends on the type of stainless steel used. For instance a high strength 17-4 stainless bolt is actually stronger then a grade 8.