From
http://www.easywebstore.co.uk/stigfa...tID~34484.aspx "Is stainless suitable to replace high-tensile bolts?
No. The vast majority of stainless fasteners listed on this site are grade A2-70, and have approximately 85% of the tensile strength of grade 8.8 steel bolts. As such, stainless fasteners are only recommended for non-stressed applications, which effectively rules out brake calipers, suspension mountings, brake discs, seatbelt anchors and propshaft bolts. We cannot advise on the suitability of replacing any OEM fasteners with stainless, or accept any responsibility for your actions in so doing. On your own head be it...... "