For the record, from RCScrewz website:
Q: Are stainless screw stronger than the stock screws that come with the cars/truck/heli kits from the manufacturer?
A: Yes - we use A2-70/A4-80 Stainless Steel Screws (Button, Socket & Countersunk Heads) Set Screws, Nuts & Washers. They are stronger than stock steel screws but not as strong as titanium.