sales@bonporaparts.com
0086-10-64988621
English
This Audi Strut Bump Stop with OE reference 8KD412131 is a polyurethane suspension buffer produced in China for the aftermarket and repair channel. It is listed under Bonpora No. 4110187 and is supplied in wholesale volumes to importers, parts distributors and workshop chains that serve Audi owners.
Bump stops are small parts with a large workload. Every time a strut compresses over a speed bump, a pothole or a loaded boot, the buffer absorbs the last part of the travel and keeps the damper rod, mount and body from meeting metal to metal. When the original foam unit crumbles or goes soft, drivers notice hard bottoming, knocking noises and uneven tyre wear. Replacing the buffer alone is often enough to restore normal ride behaviour, which makes this a high-turnover, low-cost item for most buyers.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Bonpora No. | 4110187 |
| OE Reference | 8KD412131 |
| Fitment | Audi |
| Size | Φ20 mm x Φ55.7 mm x 82.1 mm |
| Material | Polyurethane (PU) |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
The three dimensions above describe an inner bore of 20 mm, a base outer diameter of 55.7 mm and a free length of 82.1 mm. All three must be checked against the sample in hand, because an Audi strut bump stop that differs in free length by a few millimetres will change the point at which the suspension bottoms out.
Factory bump stops on many Audi platforms were made from microcellular foam. Foam is cheap and quiet when new, but it degrades with heat, ozone and repeated compression, and after some years it can crack, crumble or fall off the damper rod entirely.
Our polyurethane bump stops are microcellular PU with a closed-cell structure that resists water, salt spray, road oils and UV exposure. Compared with the original foam part, the PU version typically offers:
For buyers who want a specific durometer rather than a generic replacement, PU is easier to adjust than foam. Send us your target hardness and we can quote a matching compound.
The OE number follows the Volkswagen Group ten-digit logic, where the digit groups identify the platform family, the main assembly and the individual component. The 412 block is widely used for shock absorber related buffers, so the 8KD412131 reference normally points to the front strut buffer position on the Audi platform family that uses the 8K prefix.
Because several Audi models share strut hardware across model years, we do not publish a fixed vehicle list for this part. Instead we ask buyers to confirm three things before ordering:
This three-point check prevents the most common aftermarket complaint, which is a buffer that looks correct on the bench but sits at the wrong height on the rod. If your catalogue lists this part under a different Audi model than expected, send the chassis number and we will cross-check the strut assembly.
Most importers order bump stops together with other strut and damper consumables to fill a container or to reach a freight break. Alongside this buffer we regularly ship:
If you need a mixed box, see our full shock absorber parts range. Combining items reduces handling cost per unit and gives your workshop customers a single source for a complete strut refresh.
Every batch of 4110187 passes the following checks before packing:
Inspection records can be attached to the shipping documents on request, which helps buyers who need traceability for their own quality system.
We work with B2B buyers rather than single-unit retail. Typical order flow:
For buyers building their own brand, we support private label cartons, branded poly bags and printed instruction sheets. Our custom parts service also covers hardness changes, colour options and drawing-based development when an existing OE buffer is no longer available from the original channel.
Standard packaging is neutral export carton with inner bags, sized to keep the buffer straight and free from deformation during transit. Carton marks, labels and barcodes can be produced to your specification.
Every unit is covered by a one year warranty against manufacturing defects. Delivery is typically 15 to 30 days after order confirmation and sample approval, depending on quantity and whether the compound is standard or customised. Buyers with fixed promotion dates should share the deadline at enquiry stage so production can be scheduled accordingly.
For durability, yes in most cases. PU resists compression set, tearing and water absorption better than microcellular foam, so height and support remain stable for longer. For buyers who prioritise the softest possible feel at the very end of travel, a low-density PU compound can be specified instead of the standard one.
Possibly, but it should not be assumed. Shared platform hardware means a buffer can fit more than one model, yet revision letters and running changes can shift height or hardness. Confirm with the full OE number, measured dimensions and VIN before committing to a large order.
It depends on whether you buy from stock or need a custom compound. Stock items can be quoted in smaller trial quantities, while custom hardness, colour or private label runs need a larger batch. Share your target quantity and we will confirm the practical minimum.
Yes. For new buyers and for custom specifications we dispatch a sample for fitment and hardness approval. Once approved, the sample becomes the reference standard for the production batch.
Send us your required quantity, destination port and the OE number you are sourcing, and we will reply with price, lead time and packing options. If you are comparing this buffer against another part number, include the second reference and we will check the dimensional difference for you. Bulk pricing, mixed container loading and private label programmes are available on request.
