Posted 18 November 2016 - 02:30 PM
Stainless nuts, like ali, are positively unsafe and Minispares should not be selling them for road use. A2 grade is far weaker than the standard material and A4 grade has poor fatigue properties. Neither meets the fundamental safety requirement that when over tightened the stud must snap before the nut thread strips, so that clear warning of failure is given. The nut must ALWAYS be stronger than the bolt or stud for that to apply. Otherwise you could be driving around with nuts (anywhere on the car) that are right on the verge of failure with no way of knowing. In all areas of engineering it is a cause of accidents, some serious.
The studs are presumably grade 8.8 or even 10.9 and no ali or stainless is a suitable match for these.