The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 05621-03 |
| Category | Jets |
| Diameter | 7 mm |
| Length | 37.7 mm |
| Thread | M7 |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Shaft jet bleed 4/M7/37.7, Öhlins part number 05621-03. The piston carries the shim stacks and meters the oil; its port layout is what makes an Öhlins damper behave the way it does.
Key Features
- Öhlins part number 05621-03
- Diameter 7 mm
- Original Öhlins service part
- Thread M7
- Length 37.7 mm
Where It Sits
Öhlins gives it as 7 mm, 37.7 mm; nothing about that is approximate. Piston bands are consumables — they wear against the bore and lose their seal gradually. Port area sets how much oil can pass before the shims begin to lift. Replacing a piston is a workshop job because the shim stack has to be rebuilt in the correct order.
Why the Original
Parts remain available years after a unit leaves the current price list, which is unusual in this trade. Rebuilding to specification only works if the parts are to specification — that starts here. Ask us before ordering if you are unsure: a wrong part in a pressurised unit is an expensive lesson. If you are unsure which number your unit takes, send us the model and serial number of the damper and we will look it up.
Identifying the Right Part
The reliable route is the exploded drawing: find the position, read the number, order it — 05621-03 in this case. Öhlins states diameter 7 mm, length 37.7 mm for this number, and those figures are the deciding ones. Replacing a piston is a workshop job because the shim stack has to be rebuilt in the correct order. Needle geometry sets the shape of the adjustable range, not just its size.
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: 05621-03
- Category: Jets
- Diameter: 7 mm
- Length: 37.7 mm
- Thread: M7
- Country of Origin: Sweden
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