I'm using O-rings for the first time & my worry is that the bore diameter is very close to the ring OD, but the compression seems to be OK.
I'd appreciate if somebody with experience in those calculations can confirm if that is correct.
It's a piston type seal, 100 bar, NBR O-ring.
ORing ID=Ø70 CS=4
=> Groove Dia= ringID*(1+stretch)=70*1.02=71.4
0.5*(BoreDia-GrooveDia) = gland Height =ringCS*(1-compression)