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The strut bump stop is the progressive cushion inside a MacPherson strut: a polyurethane element that compresses as the suspension approaches full travel and keeps the damper rod from striking the top mount. This page presents the Strut Bump Stop with OE reference 1K0511353R and Bonpora No. 4110246, a polyurethane buffer produced in China for Volkswagen (VW) applications. The article explains how the part works, its dimensions and material, cross-referencing by OEM number, wholesale supply from a Chinese auto parts factory, custom manufacturing options, and practical fitting notes for workshops, importers, and parts distributors.
During normal driving the coil spring carries the vehicle weight and the damper controls body movement. When a wheel drops into a deep pothole or rides over a sharp road joint, the remaining travel of the suspension is consumed within a fraction of a second. At that moment the bump stop is compressed between the piston rod area and the upper mount of the strut. Polyurethane compresses in a progressive curve, so the part behaves like a secondary spring: gentle at first contact, then steadily firmer as compression increases. This staged response absorbs the last phase of the impact and protects the damper rod, the top mount, and the surrounding body structure from a hard bottom-out.
When the buffer is worn, cracked, or crushed flat, the strut reaches the end of its stroke without any cushion. Drivers feel a sharp knock over bumps, notice a harsher ride, and hear extra noise from the top of the suspension. VW models of the Golf platform era are widely used as family and fleet cars and often run long distances fully loaded, so their bump stops absorb a high share of impact energy and wear gradually with mileage. For workshops the bump stop is among the lowest-cost components to renew while the strut is already apart, and for distributors it is a fast-moving wear part with stable repeat demand across the European and global VW parc.
The OE reference 1K0511353R belongs to the 1K parts numbering series used by Volkswagen for the Golf V platform era. Components from this series also appear across related models built on the same platform family, such as the Jetta and Golf Plus, with catalogue entries that vary by market and model year. The most dependable check is therefore the OE number itself, supported by the chassis code and the production date. The stop slides over the damper rod and sits beneath the dust boot, above the seal area of the strut. Before ordering, confirm the exact application in the parts catalogue by brand, model, and model year, or compare the height and outer profile against the removed original part. Supplying the VIN to the supplier removes nearly all ambiguity before a quotation is issued.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Country of Origin | China |
| Bonpora Nos | 4110246 |
| OE | 1K0511353R |
| Fitment | VW |
| Size | H = 143 mm |
| Material | Polyurethane |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
The size note H = 143 mm defines the free length of the buffer: the height of the part before it is installed and compressed. The free length determines the point at which the stop starts to work inside the strut. A stop that is too long preloads the suspension and can alter ride height and handling, while one that is too short lets the strut bottom out early and transmits the impact straight into the body. Because suffix variants within the same OE number family can differ in length and stiffness, measuring the removed original part before ordering remains the safest practice, especially for workshops that service mixed model years.
Polyurethane is chosen ahead of ordinary rubber for this product family because it resists oil, ozone, road salt, and repeated compression cycles far better. It keeps its shape under sustained load, which matters on vehicles that run fully loaded or travel long distances on coarse roads, and it stays consistent in hot climates where rubber buffers tend to harden and crumble early. For distributors, the longer service life of polyurethane also means fewer warranty claims from end customers and steadier repeat business on the same part number.
Sourcing by OEM number is the most reliable route when the original part is still legible. The number 1K0511353R identifies this bump stop in VW parts listings, and it maps to a single Bonpora No. 4110246, so distributors and repeat buyers can reorder one specification without checking drawings every time. For mixed orders that span several product groups, the auto parts catalogue organises references by system and by vehicle model, which shortens the quotation workflow considerably.
If the OE number has worn away, identify the part by vehicle data instead: brand, model, model year, axle position, and strut design. A photograph of the removed part next to a ruler, together with the VIN, lets the supplier confirm the match before shipment. Workshops that service several VW models in one bay can consolidate their bump stop stock under Bonpora numbers, keeping one part code per application and simplifying reordering across the whole customer base.
This bump stop is manufactured in China for wholesale distribution. The part runs as a catalogue item, which means the tooling already exists, dimensions stay stable between production batches, and pricing is structured for carton, pallet, and container quantities rather than single-piece retail. Typical buyers include importers of suspension and rubber components, national and regional distributors serving the European vehicle parc, fleet maintenance operators, and online sellers who need a dependable source for VW fast movers. The suspension and rubber parts range from the same production site covers companion items that are usually ordered together, such as strut mounts and dust boots, so a container can be built around complete repair kits instead of single references.
Orders ship in neutral export packaging by default, so goods arrive ready for relabelling under the own brand of the distributor. Delivery time is 15 to 30 days depending on order volume and production scheduling, and the warranty period is 1 year. For first-time customers, sample quantities can be arranged before a bulk commitment, so fitment can be verified on real vehicles before the container is booked.
Each production batch is checked for free length, outer profile, and material hardness. Visual inspection covers flash, voids, and surface defects that could lead to early cracking in service. Dimensional records are kept per batch, so repeat orders match the approved sample rather than drifting over time. This batch-level traceability is one of the reasons the part can be offered with a 1-year warranty for export markets.
Beyond the catalogue part, the same production line supports OEM and custom design work. Available options include tailored polyurethane hardness, adjusted free length or outer profile, coloured material for brand recognition, branded packaging, and private-label marking. Distributors serving a defined vehicle parc often combine several suspension items in one shipment to reduce the freight cost per unit. For a custom project, send a drawing or a physical sample together with the expected annual volume. Tooling and sampling lead times are quoted separately from mass production, and a first-article sample is normally supplied for fitment confirmation before the production run starts.
Replace bump stops in pairs on the same axle, and inspect the dust boot, top mount bearing, and spring seat at the same time. A collapsed or crumbling stop usually indicates that the strut has been bottoming out, so check the damper for oil loss before refitting the assembly. Torque the top mount nut to the figure given by the vehicle maker, with the suspension at normal ride height where the service data requires it.
A polyurethane stop should seat fully on the damper rod shoulder. If it does not sit flat, it will wear unevenly and may generate noise within a short mileage. Because the buffer works inside the dust boot, a light coating of the grease specified by the vehicle maker makes future removal easier and reduces the chance of squeaking through the boot.
Typical signs are a hard knock over speed bumps, a harsh or unsettled ride, and visible cracking, crumbling, or permanent compression of the old stop. Because the stop sits under the dust boot, it should be inspected whenever a strut is disassembled. If the strut has been bottoming out, check the damper for oil seepage at the same time, since a failed buffer often shortens damper life.
The reference belongs to the 1K parts numbering series of the VW Golf V platform era, and parts from this series appear across Golf, Jetta, Golf Plus, and related models depending on market and model year. Exact fitment varies by model year, trim, and equipment, so confirm the application in the parts catalogue or send the VIN for a precise match before ordering.
Yes. OEM and custom design support is available, including adjusted polyurethane hardness, modified free length or outer profile, coloured material, and private-label packaging. Send a drawing or a sample together with the target annual volume to receive a quotation and a sampling schedule.
Delivery time is typically 15 to 30 days depending on quantity. Packaging is neutral export packaging by default, with branded options available on request, and the warranty period is 1 year. Sample quantities and mixed-container loading with other suspension parts can be arranged for new customers.
Send the OEM number 1K0511353R, the Bonpora number 4110246, the quantity, and the destination port, and the sales team will confirm specification, packing, and delivery schedule. Buyers comparing several sources can review the full auto parts line, which covers suspension, steering, and engine components from the same factory under one catalogue.
