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NAK Technical Information - Seal Tolerance
The seal width and O.D. tolerances are in tables below:
Width tolerance of seal
| Unit |
Width range |
Tolerance |
inch |
all |
+/-0.015 |
mm |
up to 10 |
+/-0.20 |
over 10 |
+/-0.30 |
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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
Bore
Diameter |
Press-fit allowance |
Permissible
eccentricity |
Metal case |
Rubber covered case |
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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