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A strut bump stop is one of the least expensive parts in a front suspension assembly and one of the most important for protecting everything around it. On Mercedes-Benz models that use a MacPherson strut front end, the bump stop absorbs the final millimetres of compression travel so the damper never bottoms out metal to metal. Importers and distributors typically find this part by searching the OE number 1683230844, by vehicle model, or by material and dimensions. This page answers those searches from a sourcing and procurement point of view.
Also called a jounce bumper, strut buffer, or compression stop, the part is a moulded elastomer sleeve that sits on the piston rod of the strut. In normal driving it stays off the strut mount. Under a hard compression event — a pothole, a speed bump, a fully loaded boot — it engages progressively and turns the last part of the travel into controlled resistance rather than a metal impact.
Elastomer parts age. Heat, ozone, road salt, and repeated compression cycles harden the material until it cracks and loses its progressive behaviour. At that point the strut starts to bottom out and the failure spreads to the mount and the damper. For the wider category, see our auto parts catalogue.
The item described here is a front strut bump stop for Mercedes-Benz applications, referenced under OE number 1683230844 and Bonpora number 4110072. The table below lists the data buyers ask for before requesting a quotation.
| Parameter | Value |
|---|---|
| Product name | Strut Bump Stop |
| OE number | 1683230844 |
| Bonpora no. | 4110072 |
| Fitment | Mercedes-Benz (front strut applications) |
| Dimensions | Φ21.83 x Φ63.05 x 80.9 mm |
| Material | Polyurethane |
| Country of origin | China |
| Warranty | 1 year |
| Delivery time | 15–30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM & custom design support |
Φ21.83 mm is the inner bore that fits over the piston rod, Φ63.05 mm is the outer diameter of the elastomer body, and 80.9 mm is the free length. All three values matter when cross-referencing. A stop with the correct bore but the wrong free length changes the point at which the suspension engages, which alters ride height under load and can generate warranty complaints.
Polyurethane handles this application well. Compared with conventional rubber it resists tearing and oil exposure better, keeps its shape over a wider temperature range, and can be moulded to a controlled hardness so the compression curve stays progressive instead of abrupt. That makes it suitable for daily-driven cars and for lightly modified suspension setups alike.
OE 1683230844 covers a range of Mercedes-Benz models built on shared front strut architecture. Fitment varies by platform, model year, and whether the car left the factory with standard or sport suspension, so the vehicle identification number or the part removed from the car remains the most reliable reference.
Bump stops are a low-unit-value, high-turnover line that supports higher-margin suspension sales. Sourcing them well is mostly about consistency rather than the lowest quotation.
Suppliers with OEM and custom design capability can produce stops to a customer drawing or sample, including non-standard bore sizes, different hardness grades, and application-specific profiles. This suits distributors building a private-label suspension range as well as workshops servicing cars with modified ride heights. If you need a made-to-spec part, our auto parts sourcing team can review drawings and samples alongside OE-referenced items.
For catalogue items held in stock, 15–30 days covers production and export preparation. New tooling adds development time, so plan the first order of a private-label line well before the selling season.
A worn bump stop is usually found during strut replacement, but it can also be diagnosed from the driver seat.
Bump stops are normally replaced together with the strut mount and dust boot, since all three share the same access procedure and a similar service life. Replace both sides of an axle at the same time, use a proper spring compressor, and torque suspension fasteners with the car at normal ride height. Compare the old elastomer part against the new item before installation to confirm the dimensions match.
No. The bump stop and the strut mount are separate components in the same assembly. The mount carries load into the body and contains the bearing; the bump stop is the elastomer element that limits compression travel. They are often replaced together, but they are not interchangeable.
Yes, provided the dimensions match the original. Polyurethane is a direct replacement material for this application, and the fitment decision is driven by bore, outer diameter, and free length rather than by material alone.
It depends on whether an existing mould fits your drawing. Where a catalogue mould matches, orders can start small; where new tooling is needed, the MOQ is set by the mould investment. Send your drawing or sample with the target annual volume for a specific quotation.
Quoted delivery is 15–30 days for stock-referenced items, with export packaging prepared for sea or air freight. Confirm the shipping method and destination port so the quotation reflects the right terms.
If you are sourcing front strut bump stops for Mercedes-Benz applications, or need a custom-moulded stop to your own specification, send us the OE number, vehicle platform, and annual volume. We can confirm availability, provide dimensional data, and quote on neutral export packaging or private-label terms.
