Öhlins O-ring 20x4 NBR70The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 00338-42 |
| Category | O-Rings |
| Inner Diameter | 20 mm |
| Cross Section | 4 mm |
| Material | NBR 70 |
| Country of Origin | Sweden |
DescriptionThe whole story▼
O-ring 20x4 NBR70, Öhlins part number 00338-42. Öhlins specifies the compound by position: NBR where oil is the concern, FKM where heat is.
Key Features
- Cross Section 4 mm
- Öhlins part number 00338-42
- Material NBR 70
- Original Öhlins service part
- Inner Diameter 20 mm
Where It Sits
Öhlins publishes 20 mm, 4 mm, NBR 70 for 00338-42 — the dimensions are the identity of the part. Assembly grease matters — the wrong compound swells the seal and it fails early. Static seals and dynamic seals are not interchangeable even in the same size. An oil seal that has hardened lets the shaft pass oil past it, and the damping fades long before the leak becomes visible.
Original Öhlins Part
Öhlins supports units that are decades old, which is why the spare parts list runs to thousands of numbers. This is an original Öhlins part, not an aftermarket equivalent — the tolerances are the ones the unit was assembled to. If the unit is already apart, compare the published dimensions with the part in your hand. Öhlins numbers do not follow a logic you can guess — always read them from the documentation.
Getting the Number Right
The reliable route is the exploded drawing: find the position, read the number, order it — 00338-42 in this case. Öhlins states inner diameter 20 mm, cross section 4 mm, material NBR 70 for this number, and those figures are the deciding ones. A ring that has taken a set no longer springs back and starts to weep under pressure. The dust seal does the hard work: it keeps the grit that would score the shaft away from the oil seal.
Fitting and Setup Service
If you would rather not open the damper yourself, we can do it — we are an authorised Öhlins service centre and rebuild these units as a matter of routine.
Specifications
- Brand: Öhlins
- Part Number: 00338-42
- Category: O-Rings
- Inner Diameter: 20 mm
- Cross Section: 4 mm
- Material: NBR 70
- Country of Origin: Sweden
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