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The strut bump stop with OE number A6383210506 is a progressive-rate foam component that slides onto the piston rod of a suspension strut. Its job is quiet but important: when the suspension compresses fully, over deep potholes, a fully loaded van, or a sharp curb strike, the bump stop cushions the metal contact between the strut body and its internal travel limit. A worn or collapsed bump stop lets the strut bottom out harshly, which stresses the damper seal, accelerates oil leakage, and turns every large bump into a hard jolt in the cabin.
Bonpora supplies this replacement part under catalog number 4110190. It is produced in micro-cellular polyurethane, inspected before packing, and shipped from our factory in China to distributors, wholesalers, and independent repair chains worldwide. The complete specification appears in the table below.
| Item | Specification |
|---|---|
| Product Name | Strut Bump Stop |
| OE Number | A6383210506 |
| Bonpora No. | 4110190 |
| Size | Φ20 mm x Φ56 mm x 85 mm (bore x base OD x free height) |
| Material | Micro-cellular polyurethane |
| Fitment | Mercedes-Benz (verify by OE number, size, and VIN) |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM and Custom Design Support |
Every dimension in that table matters when matching a bump stop. The 20 mm center bore must slide smoothly over the piston rod, the 56 mm base diameter must seat correctly on the strut seat or inside the dust cover, and the 85 mm free height determines at what point in the travel the foam begins to engage. If any of these three values differs from the part you are replacing, pause and verify the application before placing a bulk order.
Strut bump stops are made from either rubber or micro-cellular polyurethane, and the difference shows up in daily driving. Polyurethane foam has a closed, gas-filled cell structure that stiffens progressively: it stays soft through small compressions and firms up as the load increases, which smooths the final part of the suspension travel instead of stopping it abruptly.
Compared with conventional rubber buffers, micro-cellular polyurethane generally holds its properties across a wider temperature range, resists permanent compression set, and absorbs less oil and road grime over time. For commercial vehicles such as vans that carry variable payloads, that progressive behavior helps keep the rear axle controlled when the vehicle is empty in the morning and fully loaded in the afternoon. You can browse our full polyurethane bump stop catalog to compare other sizes and OE references in the same family.
The letter A at the start of A6383210506 follows the Mercedes-Benz part numbering convention, and the 638 series code is commonly associated with the W638 Vito and V-Class platform family built from 1996 to 2003. Within that numbering system, the 321 group generally covers spring strut and shock absorber related components. These references are offered for orientation only. Option codes, model-year running changes, and regional market variants can all alter which part a specific vehicle needs.
For that reason, Bonpora treats fitment as a verification task rather than a promise. Before you commit to a wholesale order, confirm the part against the full OE number, the physical dimensions of the removed component, and, where possible, the vehicle identification number. This three-step check takes only a few minutes and prevents the most common cause of returns in the bump stop category.
Locate the OE number printed or embossed on the original bump stop, or look it up in an electronic parts catalog using the exact chassis and model year. Compare the complete string A6383210506 character by character. Similar suffixes and revision letters can describe parts with different heights or durometer ratings, so a partial match is not sufficient.
With the old bump stop off the strut, measure three values with a caliper: the center bore diameter, the base outer diameter, and the free height of the foam body. Your readings should match Φ20 mm, Φ56 mm, and 85 mm respectively. Photograph the old part next to a ruler or gauge block; these images are helpful for our sales engineers to double-check the match before shipment.
If the OE label is missing or unreadable, send the vehicle identification number to our team. We cross-check the VIN against the application data we maintain for this product line and reply with a fitment confirmation, which removes guesswork from mixed-model wholesale orders.
Bonpora manufactures strut bump stops and related suspension rubber parts in-house, which allows both stock program supply and made-to-order production. For distributors, we support scheduled replenishment with stable pricing across repeat orders. For brands and private labels, our engineers work from your drawings, physical samples, or an OE reference to reproduce the required geometry, density, and durometer. Typical custom projects cover bore and seat dimensions, free height, progressive-rate tuning, and printed or embossed part numbers.
If your requirement does not match any existing reference, the fastest route is our OEM custom parts service, where you can submit drawings or sample photos for a feasibility review and quotation. Low-to-mid volume trial batches are supported so you can validate the market before scaling up.
Every production batch of Bonpora No. 4110190 passes through a defined inspection routine before packing. Operators sample dimensions on calibrated gauges, checking bore diameter, base diameter, and free height against the specification. Visual inspection covers surface cracks, flash, cell structure uniformity, and deformation. For maintained product lines, foam density and hardness are verified against the approved reference sample so that batches ordered months apart behave consistently on the vehicle.
Finished goods are stored away from direct sunlight and ozone sources, because long exposure to UV and ozone is the main aging factor for polyurethane foam parts in storage. This discipline protects shelf life for distributors who hold stock for extended periods.
Standard packing is neutral export packaging: each bump stop is bagged, boxed in specified quantities, and palletized for sea freight. Neutral packing means you can apply your own brand labels at the destination without repacking. OEM branded packaging is available for private label customers.
Normal lead time is 15 to 30 days depending on order quantity and production schedule, counted from order confirmation. We ship by sea for cost-sensitive bulk orders, by air for urgent replenishment, and by international express for samples. Our wider range of shock absorber parts is packed under the same rules, which simplifies consolidated container loading for mixed orders.
When comparing suppliers for A6383210506 or any other bump stop reference, the following checklist helps separate reliable manufacturers from trading intermediaries:
According to the Mercedes-Benz numbering convention, the A638 series code is commonly associated with the W638 Vito and V-Class family. Fitment still depends on the exact model, year, and chassis configuration, so we recommend confirming with the full OE number, the three measured dimensions, or the VIN before ordering.
It is molded from micro-cellular polyurethane foam. This material provides a progressive compression curve, holds its mechanical properties across a wide temperature range, and resists compression set better than conventional rubber buffers, which supports consistent ride behavior over the service life of the part.
Yes. Sample orders of Bonpora No. 4110190 are welcome so you can verify dimensions and material quality on a real vehicle before committing to volume. Contact our sales team with the quantity you need, and we will quote the sample cost and the fastest shipping option, usually international express.
Yes. We produce against customer drawings, samples, or an OE reference. Custom scope covers geometry, foam density and hardness, free height, and brand marking. Share your specification or a physical sample, and our engineers will confirm feasibility, provide a quotation, and arrange a trial batch for validation.
Send Bonpora your target quantity, destination port, and any packaging requirements, and our team will reply with pricing, lead time, and freight options for Mercedes-Benz strut bump stop A6383210506. Whether you need a single pallet, a mixed container of suspension parts, or a private label production run, we are ready to support your program from sample validation through repeat wholesale supply.
