Calculating Actual Seal OD
Oversized seal OD allows for static interference fit in bore.
Adding the bore diameter to the press fit allowance will give you the seal OD.
Millimeters |
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Housing
|
Metal OD |
Rubber OD |
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| Min | Max | Min | Max | |
| Up to 50 | +0.10 | +0.20 | +0.15 | +0.30 |
| 50.01-80 | +0.13 | +0.23 | +0.20 | +0.35 |
| 80.01-120 | +0.15 | +0.25 | +0.20 | +0.35 |
| 120.01-180 | +0.20 | +0.28 | +0.25 | +0.45 |
| 180.01-300 | +0.20 | +0.30 | +0.25 | +0.45 |
| 300.01-500 | +0.23 | +0.35 | +0.3 | +0.55 |
Inches |
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Housing
|
Metal OD |
Rubber OD |
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| Min | Max | Min | Max | |
| Up to 2.000 | +0.003 | +0.007 | +0.005 | +0.011 |
| 2.001-3.250 | +0.005 | +0.009 | +0.007 | +0.013 |
| 3.251-4.750 | +0.005 | +0.009 | +0.007 | +0.013 |
| 4.751-7.000 | +0.007 | +0.011 | +0.009 | +0.017 |
| 7.001-11.750 | +0.007 | +0.011 | +0.009 | +0.017 |
| 11.751-20.000 | +0.009 | +0.013 | +0.011 | +0.021 |
Example
SE825-950-57SB
Housing Bore Ø = 9.500″
Metal OD = SB style has a metal OD – See SB
9.507″ minimum seal OD = 9.500″ housing bore Ø + 0.007″ minimum press fit allowance
9.511″ maximum seal OD = 9.500″ housing bore Ø + 0.011″ maximum press fit allowance
