If you have any expertise in this area, you'd know that anodized aluminum and stainless steel together pose a bi-metallic corrosion risk. However, the risk is totally dependent on the relative amount of each metal and the conditions they're exposed to. For example, small stainless steel screws on aluminum iPhone do not pose a great risk unless you somehow drop it and leave it out on the beach for about a month or so. An example of a safe use of stainless steel and aluminum together is where SS fasteners are used to secure a large aluminum body, and there should be little risk of corrosion even with un-insulated SS fasteners (probably the same as what you've spec'd). On the other hand, small aluminum bolts holding large stainless steel parts together pose a much higher risk. Everything is relative.