Öhlins O-ring 20.35x1.78 NBR70
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number00338-11
CategoryO-Rings
Inner Diameter20.35 mm
Cross Section1.78 mm
MaterialNBR 70
Country of OriginSweden
DescriptionThe whole story▼

O-ring 20.35x1.78 NBR70, Öhlins part number 00338-11. Static seals and dynamic seals are not interchangeable even in the same size.

Key Features

  • Original Öhlins service part
  • Material NBR 70
  • Öhlins part number 00338-11
  • Inner Diameter 20.35 mm
  • Cross Section 1.78 mm

Function

20.35 mm, 1.78 mm, NBR 70: that is the whole specification, and it has to match what came out. Cross-section is as important as diameter: an O-ring that is too thin will not seal at pressure. A ring that has taken a set no longer springs back and starts to weep under pressure. Öhlins recommends replacing seals whenever the unit is opened, not only when it leaks.

Why the Original

The part number is the contract: it defines material, dimension and finish together. The tolerances here are the ones the unit was assembled to, not a pattern equivalent's interpretation of them. We can check the number against the Öhlins exploded view before you order — just ask. Order by part number. The dimensions below are the ones Öhlins publishes for it.

Getting the Number Right

The reliable route is the exploded drawing: find the position, read the number, order it — 00338-11 in this case. Check inner diameter 20.35 mm, cross section 1.78 mm, material NBR 70 against what you have removed; a close size is not the same part. An oil seal that has hardened lets the shaft pass oil past it, and the damping fades long before the leak becomes visible. Öhlins specifies seal compounds for temperature stability rather than for the lowest unit cost.

Fitting and Setup Service

Öhlins recommends that its units are serviced by an authorised centre. We are one: rebuild, revalve and setup all happen in our own workshop.

Specifications

  • Brand: Öhlins
  • Part Number: 00338-11
  • Category: O-Rings
  • Inner Diameter: 20.35 mm
  • Cross Section: 1.78 mm
  • Material: NBR 70
  • Country of Origin: Sweden
07 · Support

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08 · Paddock

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