Öhlins Shaft 14/113.5Öhlins Shaft 14/113.5
02 · Data & docs

The facts.

Technical data
BrandÖhlins
Part Number21003-51
CategoryDamper Shafts
Diameter14 mm
Length113.5 mm
Country of OriginSweden
DescriptionThe whole story▼

Shaft 14/113.5, Öhlins part number 21003-51. Shaft diameter sets the displaced volume, which is why it is part of the damper's specification.

Key Features

  • Original Öhlins service part
  • Diameter 14 mm
  • Length 113.5 mm
  • Öhlins part number 21003-51

Function

14 mm, 113.5 mm: that is the whole specification, and it has to match what came out. Surface hardness is what lets the shaft survive thousands of cycles through a seal. Chrome or nitride treatment is what lets the shaft run in a seal for thousands of kilometres. Its polished section runs directly in the seal, so any mark there ends the seal's life quickly.

Why the Original

Parts remain available years after a unit leaves the current price list, which is unusual in this trade. A damper that can be rebuilt is a damper that stays on the bike; that is the whole argument for original service parts. If the unit is already apart, compare the published dimensions with the part in your hand. Service parts are ordered per piece unless stated otherwise.

Getting the Number Right

The reliable route is the exploded drawing: find the position, read the number, order it — 21003-51 in this case. Öhlins states diameter 14 mm, length 113.5 mm for this number, and those figures are the deciding ones. The damper shaft carries the piston and passes through the seal head, so its surface finish decides how long the seals last. Chrome or nitride treatment is what lets the shaft run in a seal for thousands of kilometres.

Fitting and Setup Service

A damper rebuild is workshop work: it needs the unit dismantled, the shim stack rebuilt in the correct order and the gas charge reset. We are an authorised Öhlins service centre and do exactly that in house — send us the unit or ask us to fit the part with your order.

Specifications

  • Brand: Öhlins
  • Part Number: 21003-51
  • Category: Damper Shafts
  • Diameter: 14 mm
  • Length: 113.5 mm
  • Country of Origin: Sweden
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08 · Paddock

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