Öhlins O-ring 39x2 NBR 90The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 00638-97 |
| Category | O-Rings |
| Inner Diameter | 39 mm |
| Cross Section | 2 mm |
| Material | NBR 90 |
| Country of Origin | Sweden |
DescriptionThe whole story▼
O-ring 39x2 NBR 90, Öhlins part number 00638-97. Öhlins recommends replacing seals whenever the unit is opened, not only when it leaks.
Key Features
- Material NBR 90
- Inner Diameter 39 mm
- Öhlins part number 00638-97
- Original Öhlins service part
- Cross Section 2 mm
Where It Sits
Dimensionally this is 39 mm, 2 mm, NBR 90, which is how it is told apart from the rest of the range. Seals are the part of a damper that decides whether it holds its gas charge and its oil, and they are the usual reason a unit ends up on the bench. Seals harden with heat and age even when the machine has not been ridden much. The dust seal does the hard work: it keeps the grit that would score the shaft away from the oil seal.
Why the Original
Öhlins supports units that are decades old, which is why the spare parts list runs to thousands of numbers. The part is identical to what Öhlins fits in production — same supplier, same specification. The Öhlins exploded view names the number for each position; we can look it up if you do not have it. Send us the model and serial number of your unit and we will confirm the position before you order.
Identifying the Right Part
00638-97 is the Öhlins number for this position — the same one printed in the service documentation. inner diameter 39 mm, cross section 2 mm, material NBR 90 is what distinguishes this number from its neighbours in the range. A seal that has taken a set no longer springs back and starts to weep. An O-ring seals by being squeezed into its groove; the cross-section is therefore as important as the diameter.
Fitting and Setup Service
Ask us about a full service: as an authorised Öhlins centre we strip, inspect, replace what is worn and set the unit back to its specification.
Specifications
- Brand: Öhlins
- Part Number: 00638-97
- Category: O-Rings
- Inner Diameter: 39 mm
- Cross Section: 2 mm
- Material: NBR 90
- Country of Origin: Sweden
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