Hi -

I was suprised when I found a twisted off bolt in my upper shock mount. I had used a grade 8 stainless bolt from Home Depot. I'm usually not one to over tighten bolts - but I could have one this one.

Question - should I be using carbon steel rather than stainless?

Luckily I was able to drill it out and extract using an easy out and heat.
When I drilled it out - it seemed soft - that is - drilled out rather easily????