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NAK Technical Information - Seal Type
There are many factors to consider in the selection of seal design according to the application and operating conditions.
These are:
- Hydrodynamic Aid Design
- Lip Design
- Case and O.D. Construction
Width tolerance of seal
| Unit |
Width range |
Tolerance |
| inch |
all |
+/-0.015 |
| mm |
up to 10 |
+/-0.20 |
| |
over 10 |
+/-0.30 |
Seal outside diameter tolerances - imperial
| Bore
Diameter |
Press-fit allowance |
Tolerance |
| Metal case |
Rubber covered case |
Metal case |
Rubber covered case |
| up to 1.000 |
+ 0.004 |
+ 0.006 |
+/- 0.002 |
+/- 0.003 |
| 1.001 to 2.000 |
+ 0.004 |
+ 0.007 |
+/- 0.002 |
+/- 0.003 |
| 2.001 to 3.000 |
+ 0.004 |
+ 0.008 |
+/- 0.002 |
+/- 0.003 |
| 3.001 to 4.000 |
+ 0.005 |
+ 0.010 |
+/- 0.002 |
+/- 0.004 |
| 4.001 to 6.000 |
+ 0.005 |
+ 0.010 |
+ 0.003
- 0.002 |
+/- 0.004 |
| 6.001 to 8.000 |
+ 0.006 |
+ 0.010 |
+ 0.003
- 0.002 |
+/- 0.004 |
| 8.001 to 10.000 |
+ 0.008 |
+ 0.010 |
+ 0.004
- 0.002 |
+/- 0.004 |
| 10.001 to 20.000 |
+ 0.008 |
+ 0.010 |
+ 0.006
- 0.002 |
+/- 0.004 |
| 20.001 to 40.000 |
+ 0.008 |
+ 0.010 |
+ 0.008
- 0.002 |
+/- 0.004 |
| 40.001 to 60.000 |
+ 0.008 |
+ 0.010 |
+ 0.010
- 0.002 |
+/- 0.004 |
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Seal outside diameter tolerances - metric
| Diameter |
Metal case |
Rubber covered case |
eccentricity |
| up to 50 |
+ 0.20
+ 0.10 |
+ 0.30
+ 0.15 |
0.25 |
| over 50 to 80 |
+ 0.23
+ 0.13 |
+ 0.35
+ 0.20 |
0.35 |
| over 80 to 120 |
+ 0.25
+ 0.15 |
+ 0.35
+ 0.20 |
0.50 |
| over 120 to 180 |
+ 0.28
+ 0.18 |
+ 0.45
+ 0.25 |
0.65 |
| over 180 to 300 |
+ 0.30
+ 0.20 |
+ 0.45
+ 0.25 |
0.80 |
| over 300 to 500 |
+ 0.35
+ 0.23 |
+ 0.55
+ 0.30 |
1.00 |
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