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

The facts.

Technical data
BrandÖhlins
Part Number21023-05
CategoryDamper Shafts
Diameter1 mm
Length85 mm
ThreadM13x1
Country of OriginSweden
DescriptionThe whole story▼

Shaft extension M13x1/M17x1/85, Öhlins part number 21023-05. A bent shaft drags in the head and destroys the seal within hours — replace, never straighten.

Key Features

  • Öhlins part number 21023-05
  • Diameter 1 mm
  • Length 85 mm
  • Original Öhlins service part
  • Thread M13x1

Where It Sits

Öhlins gives it as 1 mm, 85 mm; nothing about that is approximate. Surface hardness is what lets the shaft survive thousands of cycles through a seal. This is a part that is replaced rather than repaired. The damper shaft carries the piston and passes through the seal head, so its surface finish decides how long the seals last.

Why the Original

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. Service parts are ordered per piece unless stated otherwise. For a full rebuild, the seal kit plus the wear parts is usually the sensible order.

Identifying the Right Part

Öhlins identifies this position by the number 21023-05 in the exploded view for the unit it belongs to. Check diameter 1 mm, length 85 mm against what you have removed; a close size is not the same part. The shaft is threaded at both ends: piston at one, mounting at the other. Öhlins offers several lengths per diameter because stroke differs by model.

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: 21023-05
  • Category: Damper Shafts
  • Diameter: 1 mm
  • Length: 85 mm
  • Thread: M13x1
  • Country of Origin: Sweden
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