Shaft Oil Seals come in different types and sizes to satisfy different applications, in order to determine the suitable size for the shaft oil seal you'll need the following specs:
1. Shaft Diameter (Inner Diameter – ID)
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This is the diameter of the rotating shaft that the seal lip contacts.
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It must match the seal’s inner diameter (ID) exactly for a proper fit and sealing pressure.
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Measurement: Use a micrometer or vernier caliper to measure the shaft at the sealing point.
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The shaft surface should be smooth and within tolerance (usually ±0.13 mm).
2. Bore Diameter (Outer Diameter – OD)
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This is the diameter of the housing or bore where the oil seal will be pressed.
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It corresponds to the outer diameter of the seal.
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The OD ensures a tight, static fit between the seal body and the housing.
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Measurement: Use a caliper to measure the bore in which the seal will be seated.
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The fit is typically an interference fit to prevent leakage around the outer edge.
3. Width (Thickness)
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This is the axial width or thickness of the seal body.
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It must match the available space in the housing and ensure proper alignment with the shaft.
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The width can also affect sealing pressure and stability.