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The strut bump stop is a small component with a decisive influence on ride comfort and suspension durability. For Volkswagen platforms, OE number 5Q0511357J is a frequently requested reference among aftermarket distributors, repair chains, and suspension assemblers. Bonpora supplies this part under No. 4110054 as a polyurethane strut bump stop, size Φ14.2 x Φ60.4 x 113.2 mm, with OEM and custom design support for buyers who need original-referenced or tailored replacement parts. This guide summarizes the product, its fitment logic, and the sourcing routes trade buyers use most, from OE-number lookup to private-label supply.
A strut bump stop — also called a jounce bumper or compression bumper — mounts on the damper rod of a MacPherson strut assembly, usually inside the dust cover. During normal driving it stays out of contact. It engages only when the suspension compresses beyond its designed travel: a deep pothole, a fully loaded vehicle, or a sharp strike on a speed bump. At that point the stop compresses progressively and cushions the final portion of the stroke, keeping the damper from reaching metal-to-metal contact.
A worn or collapsed bump stop affects more than comfort. The damper absorbs impacts it was never designed to take, which accelerates seal wear and can lead to oil leakage and early strut failure. Workshops recognize the symptoms quickly: a hard knock over bumps and harsh rebound on loaded corners. Replacing the stops during strut service is inexpensive protection for the damper itself, which is why distributors stock bump stops alongside shock absorber parts.
The table below lists the main parameters of Bonpora No. 4110054, the replacement part matched to OE 5Q0511357J.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| OE Reference | 5Q0511357J |
| Bonpora No. | 4110054 |
| Fitment | Volkswagen |
| Size | Φ14.2 x Φ60.4 x 113.2 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 |
The three dimensions define the application: the rod hole diameter of 14.2 mm centers the stop on the strut shaft, the 60.4 mm outer diameter sets the contact surface against the dust cover, and the 113.2 mm free height gives a tall, progressive profile that engages smoothly near the end of travel. When cross-referencing, compare all three measurements against the used part rather than relying on visual appearance alone.
OE 5Q0511357J is referenced in Volkswagen parts catalogs. The 5Q0 prefix is widely associated with components for recent Volkswagen platform vehicles, and one reference family can extend across several models and model years, so fitment should always be verified rather than assumed. Trade buyers typically confirm by one of three methods:
Confirming before ordering avoids the most common fulfillment problem: a stop that looks correct but engages at the wrong travel point.
Different buyer profiles approach the same product from different directions, and the search routes they use reflect it.
Wholesalers and catalog-driven distributors search by the reference itself: 5Q0511357J bump stop or 5Q0511357J supplier. This route gives the tightest match because the part number ties directly to tooling and dimensional records. When sending an inquiry, include the target quantity and the packaging requirement; the supplier can then confirm mold availability and quote in one round.
Repair chains and regional distributors usually search vehicle-first: Volkswagen strut bump stop, bump stop for Golf, or jounce bumper for Passat. Model-based searching works well, yet one platform family can use several similar stops. Confirming the OE number or the dimensions before ordering prevents mix-ups between visually close parts.
Suspension assemblers and engineering distributors sometimes work in reverse: they hold dimensions and material requirements but no reference number. In that case, quote the three key dimensions, the material, and the hardness if known. The factory can match an existing mold or open a custom one. The polyurethane bump stop catalog from Bonpora covers the standard range, and unmolded sizes move through the custom program.
Bump stops operate in a demanding zone of the suspension: repeated high-strain compression, contamination from water and road salt, and wide temperature swings. Conventional rubber stops harden and crumble with age, and a cracked bump stop is a common workshop finding on older vehicles.
Polyurethane microcellular foam behaves differently. Its closed-cell structure compresses progressively and recovers without permanent set, and it resists aging, ozone, and temperature extremes better than standard rubber. For the buyer, this translates into two practical advantages: a longer shelf life in the warehouse, and more consistent damping behavior across the service life of the part. The same material family is used across the shock absorber parts range from Bonpora, which simplifies sourcing when a distributor consolidates suspension wear parts with one factory.
Beyond the standard reference part, Bonpora supports OEM and custom programs for brands and large distributors. Typical requests include private-label packaging on a catalog reference, a modified design with adjusted hardness or geometry, or a completely new stop developed from a drawing or a physical sample. The engineering team confirms mold feasibility, samples the part, and validates dimensions before mass production. Details of the workflow, from drawing review to branded export packaging, are described on the custom parts page. For program buyers, combining several references into one container program keeps logistics simple and unit costs predictable.
Production runs under an IATF 16949 quality system. For bump stop manufacturing this covers incoming material verification for the polyurethane systems, in-process control of foaming parameters, and dimensional inspection of finished parts against the mold specification. Batch samples are checked for hardness and compression behavior so that replacement batches behave consistently with earlier deliveries.
The part ships with a 1-year warranty covering manufacturing defects. Correct application to the intended fitment remains the responsibility of the buyer, which is another reason the verification step above matters. Standard supply uses neutral export packaging suitable for distributors who re-box under their own brand, and production plus delivery typically take 15-30 days depending on order size and season. Mixed loading with other suspension references is available for container programs.
The reference appears in Volkswagen parts catalogs, and the same strut family can be shared across models and model years. Confirm fitment by OE number, by dimensions (Φ14.2 x Φ60.4 x 113.2 mm), or by VIN before ordering. Send the reference and the team will check it against mold records.
Yes. Existing molds cover the standard range. If the requirement differs in size, hardness, or geometry, the custom program develops the part from a drawing or a physical sample, and mold opening and sampling timelines are confirmed case by case.
Catalog parts are available in distributor-friendly quantities, and production plus delivery typically run 15-30 days. Exact MOQ depends on the reference and the packaging choice; neutral export packaging ships fastest, while private-label packaging adds production time.
Check the three key dimensions first: rod hole diameter, outer diameter, and free height. Then compare the foam texture and the mounting method, through-rod versus cup type. If a sample or a dimensional drawing is provided, the factory confirms the match before quotation.
For pricing on Bonpora No. 4110054 (OE 5Q0511357J), send the OE number, the target quantity, and the destination port to the sales team. OEM and custom design inquiries are welcome. Include a drawing or a sample description, and the team will respond with mold feasibility, unit pricing, and delivery terms for the target market.
