Ok, Loaded raises some good points/questions ... Original post by Creeper was for stainless bolts and nuts. Did I miss the "no go" post on that? The bolt heads are marked 8.8. I found a table at http://www.americanfastener.com/technical/grade_markings_steel.asp The numbers would indicate that a 8.8 metric is equivalent to a grade 5 US. Am I off in la-la land with this one? Perhaps the bolts aren't stainless if they are marked 8.8? The grinding was of short duration on the edges of the head only. Very little discoloration occurred.Cutting the slot didn't take much time either. Time = heat build up. I didn't set out to do this the cheap way. I ordered the bolts and nuts and then waited, and waited, and then got impatient.