Ok Geek question #2
 

Trying to make sure the right parts go to the right place.

Looking at the bolts on an early 911 caliper.
They are secured by a M12 x 1.5 (corse thread) by 30 (mm).

Now the washer under it on the parts diagram show it as a "spring washer B10"

So is that what we muricans call a lock washer or is it a wavy washer? And I'm assuming the B and the 10 mean something as well?

Beer is the prize. Just come n pick it up.

That is a wavy washer. Like a potato chip.

Thank you,