Öhlins Shaft extension M13x1/M17x1/85
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21020-40
CategoryDamper Shafts
Diameter1 mm
Length85 mm
ThreadM13x1
Country of OriginSweden
DescriptionThe whole story▼

Shaft extension M13x1/M17x1/85, Öhlins part number 21020-40. A shaft is measured by diameter and overall length, and both are specific to the unit it belongs to.

Key Features

  • Thread M13x1
  • Length 85 mm
  • Diameter 1 mm
  • Original Öhlins service part
  • Öhlins part number 21020-40

What It Is

At 1 mm, 85 mm it fits one position only; the next size up carries a different number. Any mark on the polished section is a reason to replace rather than to reassemble. Shaft diameter sets the displaced volume, which is why it is part of the damper's specification. Shaft diameter sets the volume displaced into the reservoir on every compression stroke.

Why the Original

Öhlins keeps service parts available for units long after they leave the current price list. Öhlins publishes dimensions for its service parts so a workshop can verify before it fits. Öhlins numbers do not follow a logic you can guess — always read them from the documentation. Öhlins parts are unit-specific: a close dimension is not a substitute.

Identifying the Right Part

Part number 21020-40 is unambiguous; the description alone is not, because Öhlins uses similar wording across sizes. diameter 1 mm, length 85 mm is what distinguishes this number from its neighbours in the range. Shaft straightness matters: a bent shaft drags in the seal head and destroys the seal within hours. Öhlins offers shafts in several lengths per diameter because the stroke differs by model.

Fitting and Setup Service

Ask us about a full service: as an authorised Öhlins centre we strip, inspect, replace what is worn and set the unit back to its specification.

Specifications

  • Brand: Öhlins
  • Part Number: 21020-40
  • Category: Damper Shafts
  • Diameter: 1 mm
  • Length: 85 mm
  • Thread: M13x1
  • Country of Origin: Sweden
07 · Support

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08 · Paddock

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