Quote:
Originally Posted by nkaminar
The concave washers also work as a bridge to even out slight differences in the thicknesses of the manifolds. The washers will cock slightly to accommodate the flanges being slightly out of plane.
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I think this function is more significant than any “spring” they may add to the connection. If “spring” was the desired effect we would use cut lock washers. And note that it’s the backs of the flanges that NK is talking about, these will not compensate for the front (sealing surface) being out of plane since the two manifolds are a bolted assembly.