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The following chart gives typical gland dimensions for common o-ring sizes. Please consult with your o-ring manufacturer for custom or application specific requirements.
To use this document, first identify if you have an internal or external pressure gland requirement. From the chart below, identify your nominal o-ring desired size, then your o-ring gland depth requirements. After you have verified your nominal o-ring size functionality within your assembly, specify / design your o-ring groove/gland.
Male and Female O-Ring Gland / Groove Installation
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For Internal Pressure tolerance the outermost surface of the o-ring gland / groove (Do) as follows:
| Do |
+.000 |
| -1% of Mean Outside Diameter of o-ring, however never more than .055 |
For External Pressure tolerance the innermost surface of the o-ring gland / groove (Di) as follows:
| Di |
+ 1% of Mean Outside Diameter of o-ring, however never more than .055 |
| -.000 |
NOTE: When possible, define tolerances as bi-lateral., i.e.
± .020, instead of +.040/-.000, or +.000/-.040. This maybe very helpfull to manufacturing in defining feature locations during programming operations for CNC machining operations. Where:
Do = Outside diameter on gland outside surface
Di = Inside diameter on gland inner surface
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O-Ring Gland / Groove Detail
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Where:
W = Width at bottom surface intersection of groove
L = Gland Depth, distance from mating surface.
R = Internal Radius |
Typical O-Ring Static Seal Glands / Grooves
See "Gland / Groove Detail" above
O-Ring Nominal Diameter |
Actual Diameter
(1)
|
Gland Depth
(L)
|
Compression Actual |
Compression % |
Gland / Groove Width
(W)
Vacuum / Gases
|
Gland / Groove Width
(W)
Liquids
|
Groove Radius
(R)
|
1/16 |
.070± .003 |
.050
to
.054 |
|
19
to
32
|
.084
to
.089 |
.101
to
.107 |
.005
to
.015
|
3/32 |
.103± .003 |
.074
to
.080 |
.020
to
.032 |
20
to
30 |
.120
to
.125 |
.136
to
.142 |
.005
to
.015
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1/8 |
|
.101
to
.107 |
.028
to
.042 |
20
to
30 |
.158
to
.164 |
.177
to
.187 |
.010
to
.025
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3/16 |
|
.152
to
.162 |
.043
to
.063 |
21
to
30 |
|
.270
to
.290 |
.020
to
.035 |
1/4 |
|
.201
to
.211 |
.058
to
.080 |
21
to
29 |
.309
to
.314 |
.342
to
.362 |
.020
to
.035
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(1) May vary between different o-ring manufacturers
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