Öhlins O-ring 54x2 NBR70The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 00638-23 |
| Category | O-Rings |
| Inner Diameter | 54 mm |
| Cross Section | 2 mm |
| Material | NBR 70 |
| Country of Origin | Sweden |
DescriptionThe whole story▼
O-ring 54x2 NBR70, Öhlins part number 00638-23. Öhlins specifies seal compounds for temperature stability rather than for the lowest unit cost.
Key Features
- Cross Section 2 mm
- Öhlins part number 00638-23
- Material NBR 70
- Inner Diameter 54 mm
- Original Öhlins service part
What It Is
00638-23 is the 54 mm, 2 mm, NBR 70 version — Öhlins lists each size separately. Size is given as inner diameter and cross-section; a close size is not a match. O-rings are single-use in a pressurised damper — they are replaced whenever the unit is opened. Öhlins specifies the compound by position: NBR where oil is the concern, FKM where heat is.
Why the Original
Buying the individual part rather than a complete assembly is what makes servicing an Öhlins unit worthwhile. A damper that can be rebuilt is a damper that stays on the bike; that is the whole argument for original service parts. Service parts are ordered per piece unless stated otherwise. Öhlins parts are unit-specific: a close dimension is not a substitute.
Getting the Number Right
The reliable route is the exploded drawing: find the position, read the number, order it — 00638-23 in this case. inner diameter 54 mm, cross section 2 mm, material NBR 70 is what distinguishes this number from its neighbours in the range. An O-ring seals by being squeezed into its groove; the cross-section is therefore as important as the diameter. Static seals and dynamic seals are not interchangeable even in the same size.
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: 00638-23
- Category: O-Rings
- Inner Diameter: 54 mm
- Cross Section: 2 mm
- Material: NBR 70
- Country of Origin: Sweden
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