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Finding a BMW strut bump stop that survives real road conditions comes down to three things: the correct OE reference, a material that does not crumble, and a supplier who can repeat the same quality order after order. This page covers the bump stop that matches OE 33531136395, its dimensions, its fitment, and how procurement teams usually source it from China.
A strut bump stop is the progressive rubber or polyurethane cushion mounted on the strut rod. It limits upward suspension travel before the damper bottoms out and absorbs the sharp end of that movement. On BMW front and rear strut assemblies, the original bump stop also works with the dust boot to keep grit off the rod seal.
When the part fails, the symptoms are consistent: a hard metallic knock over speed bumps, a harsh ride on broken surfaces, a strut mount that takes loads it was never designed for, and in some cases a damper that loses oil because the rod was allowed to bottom out. Buyers usually start looking after a workshop inspection reports a split or crumbling bump stop.
The table below lists the production specification for Bonpora reference 4110071, the direct-fit replacement for OE 33531136395. Polyurethane is used instead of conventional cellular foam because it holds its shape and hardness far longer under repeated compression, which matters for vehicles used on poor road surfaces.
| Item | Specification |
|---|---|
| Product Name | Strut Bump Stop |
| OE Reference | 33531136395 |
| Bonpora No. | 4110071 |
| Fitment | BMW |
| Size (OD x ID x Height) | Φ9.5 x Φ55.4 x 106.3 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 |
Dimension tone is worth noting for buyers: the 9.5 mm internal bore is a snug push fit onto the strut rod, while the 55.4 mm outer diameter and 106.3 mm height set the compression travel. When cross-referencing a competitor’s part, compare all three figures rather than only the OE number, because a shorter cushion changes where the suspension bottoms out.
| Material | Behaviour | Typical Lifespan |
|---|---|---|
| Cellular foam (common OE style) | Light, low cost, degrades faster in heat and ozone | Short to medium |
| Microcellular polyurethane | Retains hardness, resists oil and abrasion | Medium to long |
| Solid polyurethane (higher hardness) | Very durable, firmer in compression, best for heavy load or rough roads | Long |
Most procurement conversations fall into one of three patterns, and the right path depends on whether you are maintaining an existing catalogue or building a private-label line.
The fastest route is a straight OE cross-reference. Send the reference 33531136395 plus your required quantity, and the supplier confirms fitment, hardness grade and packing. This suits distributors, repair chains and e-commerce sellers who already know the vehicle application and only need a reliable second source.
If you sell under your own brand, custom production is usually the better commercial choice. Tooling can be developed to your drawing, with your chosen polyurethane hardness, your own outer diameter and height, and your logo or part number moulded or printed on the cushion. Custom projects normally require a drawing or sample, a tooling lead time, and a minimum order quantity agreed before production — all of which should be confirmed in writing in the quotation.
For a wider view of the same product family, our auto parts catalogue groups suspension rubber components by vehicle application and OE reference.
| Check | Why It Matters |
|---|---|
| OE number confirmed against VIN or parts catalogue | Avoids wrong-fit returns and freight loss |
| Dimensions verified (ID, OD, height) | Travel and fit depend on all three |
| Material and hardness agreed in writing | Directly affects service life |
| Packaging and marking confirmed | Neutral packing avoids brand conflicts |
| Inspection terms agreed | Protects both sides on batch variation |
The part is listed for BMW applications that use OE 33531136395. Because BMW frequently uses the same bump stop across several models and production years, always confirm against the specific VIN rather than the model name alone. Bump stops for other platforms in the same family typically share a similar construction but differ in bore diameter and height, so a part that fits one strut may be too short for another.
If you are sourcing several suspension items together — bump stops, dust boots, top mounts, spring pads — consolidating them into one shipment usually reduces landed cost more than negotiating a few cents off a single item. Our BMW suspension and rubber parts range is organised to make that consolidation straightforward, and you can list all required references in one enquiry.
Parts ship in neutral export packaging, which suits importers who repack under their own label. Standard delivery runs 15-30 days depending on order size and moulding schedule, with custom tooling adding time for sampling and approval. Every order carries a 1-year warranty covering manufacturing defects. Warranty terms apply to the part as supplied and depend on correct installation and use; they are not a statement about how long the part will last on any specific vehicle, since road conditions, load and geometry all affect service life.
China remains the dominant production base for automotive rubber and polyurethane components, and the reasons are practical rather than promotional: mature mould-making capacity, flexible batch sizes, and the ability to run a custom compound rather than only a catalogue formulation. For a buyer, the value comes from working with a factory that can explain the compound it uses, quote tooling and unit cost separately, and repeat the same specification on the next order.
Bonpora supplies strut bump stops, dust boots and related suspension rubber parts for European, Japanese, Korean and American vehicles, with OEM and custom design support. You can review the full auto parts range or send your OE list for quotation.
Yes. Quoting with OE 33531136395 plus quantity is usually enough to start. If your application is unusual, include the VIN or the vehicle model and year so fitment can be double-checked before production.
Polyurethane generally holds its hardness and shape longer under repeated compression, oil exposure and heat, so it often outlasts cellular foam in the same position. Whether it is the right choice depends on your application and how firm a bump-stop response your suspension is designed for.
Yes. Custom design and OEM production are supported. Provide a drawing, sample or required dimensions, and we will quote tooling, minimum order quantity and lead time separately so you can evaluate the full cost.
MOQ depends on whether the item is an existing mould or a new one, and lead time is typically 15-30 days from confirmation for standard items. Custom projects start after drawing approval and sampling, and the exact schedule is stated in the quotation.
Send us the OE reference, quantity and any custom requirement — internal bore, outer diameter, height, hardness or branding — and we will reply with unit price, tooling cost where applicable, MOQ and lead time. OEM and custom design support available. Warranty: 1 year. Delivery: 15-30 days.
Include your company name, destination port and target market so the quotation accounts for packaging and shipping.
