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AS568 Back-Up Ring Groove Information
 
The O-Ring Store LLC

 
There are countless applications and groove dimensions that O-Rings can be used for. Some of the most common grooves used in Fluid Power applications are listed below. For other groove designs, please contact your local Freudenberg-NOK representative.
O-Ring Groove BackupO-Ring Groove

Back_up Ring Groove
 Static Back-Up Rings
The following table represents standard groove dimensions for AS568 O-rings and AS568 Back-Up rings. Information contained herein is directly from the AS568 standards and is provided as-is. For Rod Glands, the nominal ID will be the nominal O-Ring ID, and for Piston Grooves, the nominal OD will be the nominal O-Ring OD.
 
AS568
Groove
Cross Section (C.S.) Groove Eccentricity
Max.
Dash No. Nom. Act. T
Thickness
1 Back-Up
L1
2 Back-Ups
L2
E
Depth
R
Radius
-006
thru
-050
1/16 0.053
+/-0.003
0.045
+/-0.003
0.138
to
0.143
0.205
to
0.210
0.050
to
0.052
0.005
to
0.015
0.002
-110
thru
-178
3/32 0.086
+/-0.003
0.045
+/-0.003
0.171
to
0.176
0.238
to
0.243
0.081
to
0.083
0.005
to
0.015
0.002
-204
thru
-281
1/8 0.118
+/-0.004
0.040
+/-0.003
0.208
to
0.213
0.275
to
0.280
0.111
to
0.113
0.010
to
0.025
0.003
-309
thru
-384
3/16 0.183
+/-0.005
0.060
+/-0.004
0.311
to
0.316
0.410
to
0.415
0.170
to
0.173
0.020
to
0.035
0.004
-425
thru
-460
1/4 0.236
+/-0.006
0.096
+/-0.005
0.408
to
0.413
0.538
to
0.543
0.226
to
0.229
0.020
to
0.035
0.005
All dimensions are in inches.

 

Please note that for dynamic sealing, the sliding surface must have at least a 16 Rms surface finish as shown here.
 Dynamic O-Rings
The following table represents recommendations for dynamically AS568 O-Rings and Back-Up rings. For Rod Glands, the nominal ID will be the nominal O-Ring ID, and for Piston Grooves, the nominal OD will be the nominal O-Ring OD.
 
AS568
O-Ring
Cross Section (C.S.) Groove Eccentricity
Max.
Dash No. Nom. Act. T Thickness 1 Back-Up L1 2 Back-Ups L2 E
Depth

 

R
Radius
-006
thru
-050
1/16 0.053
+/-0.003
0.045
+/-0.003
0.138
to
0.143
0.205
to
0.210
0.050
to
0.052
0.005
to
0.015
0.002
-110
thru
-178
3/32 0.086
+/-0.003
0.045
+/-0.003
0.171
to
0.176
0.238
to
0.243
0.081
to
0.083
0.005
to
0.015
0.002
-204
thru
-281
1/8 0.118
+/-0.004
0.040
+/-0.003
0.208
to
0.213
0.275
to
0.280
0.111
to
0.113
0.010
to
0.025
0.003
-309
thru
-384
3/16 0.183
+/-0.005
0.060
+/-0.004
0.311
to
0.316
0.410
to
0.415
0.170
to
0.173
0.020
to
0.035
0.004
-425
thru
-460
1/4 0.236
+/-0.006
0.096
+/-0.005
0.408
to
0.413
0.538
to
0.543
0.226
to
0.229
0.020
to
0.035
0.005
All dimensions are in inches.

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