Be careful what you buy from chain stores. To start with stainless fasteners are a lot less strong than coresponding steel fasterners. Some of the stainless additives just aren't all that tough.
Next problem is that within a genreally weaker group of fasteners stainless hardware varies enormously in quality, both as relates to stain resistence and, importantly, strength. Stainless hardware can be really weak so if you health depends on the performance of your bolts, check to seel is plated steel is advisable, and if SS is OK be sure you get the right grade.