Öhlins Shaft 8/474Öhlins Shaft 8/474
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21812-20
CategoryDamper Shafts
Diameter8 mm
Length474 mm
Country of OriginSweden
DescriptionThe whole story▼

Shaft 8/474, Öhlins part number 21812-20. Its polished section runs directly in the seal, so any mark there ends the seal's life quickly.

Key Features

  • Diameter 8 mm
  • Öhlins part number 21812-20
  • Length 474 mm
  • Original Öhlins service part

Where It Sits

Öhlins gives it as 8 mm, 474 mm; nothing about that is approximate. The damper shaft carries the piston through the oil and out through the seal head. This is a part that is replaced rather than repaired. Öhlins hardens and surface-treats its shafts because a scratch on the running surface takes the seal with it.

Original Öhlins Part

This is an original Öhlins part, not an aftermarket equivalent — the tolerances are the ones the unit was assembled to. Rebuilding to specification only works if the parts are to specification — that starts here. Tell us the damper's model designation and year and we will match the number for you. Where a number has been superseded, Öhlins states the replacement — we pass that on.

Getting the Number Right

The reliable route is the exploded drawing: find the position, read the number, order it — 21812-20 in this case. Check diameter 8 mm, length 474 mm against what you have removed; a close size is not the same part. Surface hardness is what lets the shaft survive thousands of cycles through a seal. The shaft is threaded at both ends: piston at one, mounting at the other.

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: 21812-20
  • Category: Damper Shafts
  • Diameter: 8 mm
  • Length: 474 mm
  • Country of Origin: Sweden
07 · Support

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08 · Paddock

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