Öhlins O-ring 25.8x3.53 NBR70
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number00438-29
CategoryO-Rings
Inner Diameter25.8 mm
Cross Section3.53 mm
MaterialNBR 70
Country of OriginSweden
DescriptionThe whole story▼

O-ring 25.8x3.53 NBR70, Öhlins part number 00438-29. The dust seal does the hard work: it keeps the grit that would score the shaft away from the oil seal.

Key Features

  • Inner Diameter 25.8 mm
  • Original Öhlins service part
  • Öhlins part number 00438-29
  • Cross Section 3.53 mm
  • Material NBR 70

Where It Sits

Dimensionally this is 25.8 mm, 3.53 mm, NBR 70, which is how it is told apart from the rest of the range. A ring that has taken a set no longer springs back and starts to weep under pressure. A seal that has taken a set no longer springs back and starts to weep. Öhlins uses seals with a spring-loaded lip so they follow the shaft as it wears.

Why the Original

An original part keeps the unit within its published specification; a near-equivalent quietly moves it. Rebuilding to specification only works if the parts are to specification — that starts here. Order by part number. The dimensions below are the ones Öhlins publishes for it. Öhlins parts are unit-specific: a close dimension is not a substitute.

How to Be Sure It Fits

Order under 00438-29. Where several sizes share a description, only the number separates them. Öhlins states inner diameter 25.8 mm, cross section 3.53 mm, material NBR 70 for this number, and those figures are the deciding ones. 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. Cross-section is as important as diameter: an O-ring that is too thin will not seal at pressure.

Fitting and Setup Service

We are an authorised Öhlins service centre, so you do not have to source the tools and the nitrogen: send us the damper and we rebuild it with the correct parts and the correct setting.

Specifications

  • Brand: Öhlins
  • Part Number: 00438-29
  • Category: O-Rings
  • Inner Diameter: 25.8 mm
  • Cross Section: 3.53 mm
  • Material: NBR 70
  • Country of Origin: Sweden
07 · Support

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