Öhlins Shaft extension M13x1/M17x1/75
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21020-30
CategoryDamper Shafts
Diameter1 mm
Length75 mm
ThreadM13x1
Country of OriginSweden
DescriptionThe whole story▼

Shaft extension M13x1/M17x1/75, Öhlins part number 21020-30. Adjuster shafts run inside the main shaft on units with a rod-through adjuster.

Key Features

  • Öhlins part number 21020-30
  • Original Öhlins service part
  • Diameter 1 mm
  • Length 75 mm
  • Thread M13x1

Where It Sits

Dimensionally this is 1 mm, 75 mm, which is how it is told apart from the rest of the range. Corrosion on a stored damper usually starts on the exposed shaft. Shaft straightness matters: a bent shaft drags in the seal head and destroys the seal within hours. Surface hardness is what lets the shaft survive thousands of cycles through a seal.

Why the Original

Öhlins supports its suspension with individual service parts, which is why a fifteen-year-old damper can still be rebuilt to specification. The tolerances here are the ones the unit was assembled to, not a pattern equivalent's interpretation of them. Öhlins parts are unit-specific: a close dimension is not a substitute. The exploded drawing for your unit names the number; if you do not have it, we do.

Identifying the Right Part

21020-30 is the Öhlins number for this position — the same one printed in the service documentation. The published dimensions are diameter 1 mm, length 75 mm — measure the old part against them if you are unsure. Shaft diameter sets the volume displaced into the reservoir on every compression stroke. The damper shaft carries the piston through the oil and out through the seal head.

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: 21020-30
  • Category: Damper Shafts
  • Diameter: 1 mm
  • Length: 75 mm
  • Thread: M13x1
  • Country of Origin: Sweden
07 · Support

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