SEAT Volkswagen Strut Bump Stop 6N0512131A: OEM and Custom Polyurethane Replacement Parts from China Factory

The VW Polo and its SEAT platform siblings were built in very large volumes across Europe, Latin America, and Asia, and large numbers of these cars are still in daily service today. For parts distributors and suspension workshops, this keeps replacement demand steady for small but essential components such as the shock absorber bump stop. Bonpora supplies a replacement rear suspension bump stop for SEAT and Volkswagen applications under Bonpora No. 4110052, matching OE number 6N0512131A, molded in polyurethane with dimensions of Φ11 × Φ40 × 113 mm.

The buffer mounts on the piston rod of the rear shock absorber and cushions the final stage of suspension compression before metal can contact metal. This page covers the specifications, fitment coverage, and ordering options for the part, whether you purchase by OEM number, need private-label packaging, or require custom production. Related suspension components can be found in our shock absorber parts catalog.

What Is a Shock Absorber Bump Stop and Why Does It Matter?

A bump stop, also called a stop buffer or jounce bumper, is a compressible element fitted around the piston rod of a shock absorber or strut. When the suspension reaches full compression — hitting a deep pothole, carrying a heavy load, or crossing a large bump at speed — the bump stop cushions the last portion of travel and prevents the damper from bottoming out against its housing.

On the Polo 6N platform and the related SEAT 6K models, this reference is fitted on the rear axle, one buffer per side. The part is compact — a molded polyurethane body with a central hole that slides onto the damper rod — yet it works on every severe compression event the rear suspension experiences. It operates alongside the dust cover, spring seat, and support parts, all of which age together over the life of the vehicle.

Its job covers three areas:

• Protecting the shock absorber: it prevents the piston rod and internal valves from hitting the end of their travel, which can damage the damper and shorten its service life.
• Protecting the vehicle: it absorbs harsh impacts that would otherwise pass directly into the chassis and cabin.
• Keeping the ride predictable: a sound bump stop helps the rear axle behave consistently during full-compression events, especially when the car is loaded.

Because the part works quietly in the background, drivers usually notice it only after it fails. A worn or crumbled bump stop allows hard bottoming over uneven roads, knocking noises from the rear axle, and accelerated wear on the shock absorber it was meant to protect.

For wholesalers, the bump stop is a typical fast-moving item in the suspension category: small, lightweight, inexpensive, and requested repeatedly by repair shops servicing aging vehicle fleets. Stable long-term supply and consistent batch quality usually matter more to distributors than a one-time low price.

SEAT Volkswagen Bump Stop 6N0512131A Specifications

Bonpora No. 4110052 is produced to match the dimensions and compression behavior of the original VAG part. Key specifications are summarized below:

The inner diameter of 11 mm matches the rear damper rod of the application, while the 113 mm free length provides the progressive cushioning curve of the original buffer. Always confirm the reference against the part fitted on the vehicle before ordering, as described in the fitment section below.

Fitment Guide: Which Models Does 6N0512131A Fit?

OE reference 6N0512131A is used on rear shock absorbers of the VW Polo 6N platform and the closely related SEAT 6K models. Typical applications include:

• Volkswagen Polo 6N (third generation, from 1994), including 1.0 to 1.9D engines
• Volkswagen Polo Classic and Polo Variant (6K platform)
• Volkswagen Derby in Latin American markets, where production continued well into the 2000s
• SEAT Ibiza II and Ibiza III (6K platform)
• SEAT Cordoba (6K platform), including Vario versions

On these vehicles the buffer is fitted on the rear axle, left and right sides. Production years of the applications span roughly 1993 to the early 2000s in Europe, with some Latin American derivatives built even later, so verifying fitment before ordering is essential. We recommend one of three approaches:

1. Check the OE number printed or molded on the original bump stop removed from the vehicle.
2. Look up the reference in a parts catalog such as the VW or SEAT EPC, using the VIN, model year, and chassis number range of the vehicle, since some references apply only up to a certain chassis number.
3. Send us the details — model, year, engine, or a photo of the old part — and our team will confirm the correct number for you.

This step avoids the most common cause of returns in the suspension parts trade: ordering by appearance alone without checking dimensions or OE references. If a workshop is renewing the rear suspension, it is worth inspecting the dust covers and spring seats at the same time, since the labor of disassembly is already invested.

Signs of a Worn or Failed Bump Stop

Common Symptoms

Bump stops degrade gradually through repeated compression cycles, ozone exposure, and contact with road salt and moisture. Typical indicators include:

• A solid knocking or thudding noise from the rear axle when driving over potholes or speed bumps
• A harsher ride than usual, especially when the car carries passengers or cargo
• Visible cracking, crumbling, or missing sections of material found during a suspension inspection
• Shortened shock absorber life, since the damper loses the buffer that shields it from full-compression impacts

When Should You Replace It?

Many workshops inspect bump stops whenever rear shock absorbers are replaced, and replace them in pairs so that compression behavior stays balanced from left to right. Reusing a heavily compressed or hardened bump stop with a new damper is generally not advised, because the aged material no longer cushions full-compression events as designed.

For distributors, stocking this low-cost, high-turnover reference is practical: it is requested both as a single repair part and as an accompanying item when workshops renew complete rear suspension assemblies on Polo and Ibiza cars.

Why Choose a Polyurethane Bump Stop?

Original buffers of this generation and many aftermarket equivalents are made from rubber or micro-cellular foam. Bonpora molds this reference in polyurethane, a material widely used in polyurethane bump stops for suspension applications:

• Consistent cushioning: polyurethane holds its compression characteristics across repeated cycles and resists permanent set better than many standard rubber compounds.
• Aging resistance: the material handles ozone exposure, oil contact, and temperature swings in the wheel-arch environment well.
• Dimensional stability: molding tolerances keep the inner diameter and free length consistent, which matters when the buffer slides onto the damper rod during assembly.

Material choice always involves trade-offs: polyurethane is typically slightly firmer than foam-type alternatives. For these applications, buyers operating in regions with rough roads or heavy loads often select it for durability and for consistent quality from batch to batch.

How to Order from a Suspension Bump Stop Supplier

Order by OEM Number

The fastest route for buyers is to reference the OE number directly — searching 6N0512131A locates this product in our catalog. When sending an inquiry, include the OE number or Bonpora number (4110052), the required quantity, and your destination port or country so that we can quote freight accurately.

OEM Branding and Custom Design

Beyond catalog supply, Bonpora offers OEM and custom design support for suspension and shock absorber components: production against customer drawings or samples, adjustable material hardness for specific applications, private branding, and tailored packaging. This route suits suspension assemblers and parts brands that are building a long-term supply program rather than purchasing single batches.

Purchasing teams often start with a trial quantity to verify fitment, packaging, and documentation before moving to scheduled volume orders; sharing an annual volume estimate helps us propose a realistic production plan.

Packaging, Delivery Time and Warranty

Each bump stop ships in neutral export packaging as standard, so distributors can re-box the goods under their own brand without conflict. Standard delivery time is 15–30 days, depending on order volume and production scheduling; tighter schedules can be discussed with our sales team. The product is covered by a 1-year warranty against material and manufacturing defects. For buyers consolidating multiple suspension SKUs into one shipment, neutral packaging also simplifies mixing different items in the same carton without brand conflicts.

FAQ: Bump Stop 6N0512131A for SEAT and Volkswagen

Which models does the 6N0512131A bump stop fit?

It fits the rear axle of VW Polo 6N, Polo Classic, and Polo Variant (6K), and SEAT Ibiza II/III and Cordoba (6K). Confirm the number on your original part, or send us your vehicle details for verification before ordering.

Is this buffer fitted to the front or the rear axle?

OE reference 6N0512131A is the rear shock absorber buffer on these applications, fitted on both left and right sides. Front suspension parts for the same platforms use different references, so always confirm the position before ordering.

Can I order bump stops with my own brand and packaging?

Yes. Neutral export packaging is the standard option, and we support OEM branding and custom design, including production to your drawings or samples and private-label packaging programs.

What are the delivery time and warranty terms?

Standard lead time is 15–30 days after order confirmation, subject to quantity, and the product carries a 1-year warranty against material and manufacturing defects.

Need a reliable source for SEAT and Volkswagen bump stops? Request a quotation for Bonpora No. 4110052 (OE 6N0512131A) with your target quantity, or send us your drawing to discuss a custom polyurethane program — contact our sales team today.