O-Ring Installation Design and Specification For Dynamic / Reciprocating Applications

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The following chart gives typical gland dimensions for common o-ring sizes within reciprocating / dynamic applications. Please consult with your o-ring manufacturer for custom or application specific requirements.

To use this document, first identify if you have a rod or piston application 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.

Piston / Rod O-Ring Gland / Groove Installation

O-Ring Installation Design and Specification For Dynamic / Reciprocating Applications

For male / piston application :

GD = FDmax + 2Lmax

For female / rod application:

GD = FDmax - 2Lmax

Where:

GD = Gland diameter
PD = Pipe Diameter (adjacent to gland)
FD = Fit Diameter (cylinder which o-ring mates against)
C = Clearance

O-Ring Gland / Groove Detail

O-Ring Gland / Groove Detail

Where:

W = Width at bottom surface intersection of groove
L = Gland Depth, distance from mating surface.
R = Internal Radius

Typical Reciprocating / Dynamic 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)
Groove Radius
(R)
Total Runout
Maximum
(TR)
Total Runout
Maximum
GD relative to FD
1/16
.070± .003
.055
to
.057

.010
to
.018
15
to
25
.093
to
.089
.005
to
.015
.0010
.002
3/32
.103± .003
.088
to
.090
.010
to
.018
10
to
17
.140
to
.145
.005
to
.015
.0010
.002
1/8
.138± .004
.121
to
.123
.012
to
.022
9
to
16
.187
to
.192
.010
to
.025
.0015
.003
3/16
.210± .005
.185
to
.188
.017
to
.030
8
to
14

.281
to
.286
.020
to
.035
.002
.004
1/4
.275± .006
.237
to
.240
.029
to
.044
11
to
16
.375
to
.380
.020
to
.035
.0025
.005

(1) May vary between different o-ring manufacturers

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