What O-ring groove? - our customers ask

The depth of the groove should be adapted to the specific purpose - this will make the seal impermeable. The ratio of the seal cross-section diameter (s) to the groove depth determines the preload. If you are looking for a static seal, the initial stress should be between 15 and 30%. However, in the case of dynamic use, the best solution will be to choose a larger groove depth, and hence a smaller initial stress (usually from 6 to 20%).

When determining the width of the groove, consider:

  • O-ring diameter (s)
  • oval form formed after assembly
  • free space, which is necessary to ensure even pressure

It is important to prevent the groove from overfilling - the O-ring should fill it to a maximum of 85%, leaving room for possible increase in volume.

The table gives the groove parameters for static use (depth and width):

s O-ring thicknessT groove depthB groove width
1,51,11,9
1,61,22,1
1,781,32,3
21,52,6
2,41,83,1
2,51,93,2
2,6223,4
32,33,9
3,532,754,5
43,155,2
546,5
5,74,657,4
64,957,8
6,995,859,1
86,7510,4
8,47,1510,9
97,711,7
108,6513