If I'm using a bolt that is load bearing or might have a bearing on safety - it does not come from TSC (99% Chinese made) Lowe's or Home Depot. I'll occasionally use one of their Gr8's in place of a Gr5, and their Gr5's in place of the CS Gr2's.

Most of what I use are ARP(engine, for sure) McMaster-Carr or Fastenal - but even some of them are starting to be made off shore. With McMaster-Carr, you can order bolts based on the spec needed and is spelled out on-line. My experience with Fastenal is less because their local store is inconvenient and I find their on-line catalog not as easy to navigate.