The actual O.D. of the seal is produced slightly larger then the bore size.
Thus to create the interference needed so the seal will not slide out of the housing during operation.
The tables below show the DIN 3760 press-fit standards per the seal O.D. size and design.
For example, a seal with a rubber covered O.D. such as our TC design with a 50mm O.D. will have an actual O.D. of 50.15 – 50.30.
| PRESS-FIT TOLERANCE INCH (in) | ||
| Bore Diameter | Metal Case | Rubber Covered Case |
| Up to 1.000 1.001 to 2.000 2.001 to 3.000 3.001 to 4.000 4.001 to 6.000 6.001 to 8.000 8.001 to 10.000 10.001 to 20.000 20.001 to 40.000 40.001 to 60.000 |
+0.004 +0.004 +0.004 +0.005 +0.005 +0.006 +0.008 +0.008 +0.008 +0.008 |
+0.006 +0.007 +0.008 +0.010 +0.010 +0.010 +0.010 +0.010 +0.010 +0.010 |
| PRESS-FIT TOLERANCE METRIC (mm) | ||
| Bore Diameter | Metal Case | Rubber Covered Case |
| Up to 50.0 50.1 to 80.0 80.1 to 120.0 120.1 to 180.0 180.1 to 300.0 300.1 to 500.0 |
+0.10/+0.20 +0.13/+0.23 +0.15/+0.25 +0.18/+0.28 +0.20/+0.30 +0.23/+0.35 |
+0.15/+0.30 +0.20/+0.35 +0.20/+0.35 +0.25/+0.45 +0.25/+0.45 +0.30/+0.55 |
