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 thickness	T groove depth	B groove width
1,5	1,1	1,9
1,6	1,2	2,1
1,78	1,3	2,3
2	1,5	2,6
2,4	1,8	3,1
2,5	1,9	3,2
2,62	2	3,4
3	2,3	3,9
3,53	2,75	4,5
4	3,15	5,2
5	4	6,5
5,7	4,65	7,4
6	4,95	7,8
6,99	5,85	9,1
8	6,75	10,4
8,4	7,15	10,9
9	7,7	11,7
10	8,65	13