Proton Strut Bump Stop PW-861069 & PW-922648 | Polyurethane Absorber Stopper Supplier

Among the wear items in a suspension system, the strut bump stop is one of the smallest and one of the most frequently overlooked. Bonpora produces this replacement strut bump stop, also known as an absorber stopper or damper bush, under Bonpora No. 4110066, matching OE references PW-861069 and PW-922648. The part is molded in polyurethane with a size of Φ18.7 × Φ58.1 × 80 mm and is supplied from our factory in China to distributors, suspension workshops, and shock absorber assemblers worldwide. References with the PW prefix belong to the Proton parts numbering system, and PW-922648 in particular is widely listed in the aftermarket as the front absorber stopper for Proton Iriz, Persona, and Saga applications.

On this page, buyers will find the specifications of the part, a fitment verification guide based on OEM number lookup, the symptoms of a worn bump stop, the advantages of polyurethane as a material, and the ordering options available from Bonpora as a strut bump stop supplier, including OEM branding and custom design. For related components, browse our shock absorber parts catalog.

What Does a Strut Bump Stop Do?

A strut bump stop is a compressible element fitted around the piston rod of a shock absorber or strut. During normal driving the component stays inside the dust cover and does not engage. It only comes into play when the suspension approaches full compression: a deep pothole, a heavily loaded vehicle crossing a large bump, or a hard landing after a crest. At that moment the bump stop compresses progressively and absorbs the remaining energy before metal parts can contact each other.

Its workload covers three areas:

• Protecting the shock absorber: repeated metal-to-metal bottoming damages the piston rod, the rod guide, and the internal seal, which shortens the service life of the damper.
• Protecting the chassis: the buffer absorbs harsh impacts that would otherwise pass directly into the body and the cabin.
• Keeping handling predictable: a sound bump stop supports consistent suspension behavior during full-compression events.

Because the part works quietly inside the strut, drivers usually notice it only after it fails. A worn bump stop allows hard bottoming, knocking noises over uneven roads, and accelerated wear on the damper it was meant to protect.

For parts distributors, the bump stop is a typical fast-moving item in the suspension category: light, compact, and requested repeatedly by repair workshops. That is why stable long-term supply and consistent batch quality usually matter more to buyers than a one-time low price.

Strut Bump Stop Specifications: OE PW-861069 / PW-922648

Bonpora No. 4110066 is produced to match the dimensions and compression behavior of the original reference. The main specifications are summarized below:

Both OE references are supplied together under Bonpora No. 4110066. Always confirm the number against the part fitted on the vehicle before ordering, as described in the fitment guide below.

Fitment Guide: Matching PW-861069 and PW-922648 to the Right Vehicle

References beginning with PW belong to the parts numbering system used by Proton. In the aftermarket, PW-922648 is commonly listed as the front absorber stopper for Proton Iriz, Persona VVT, and Saga VVT applications, and catalogs also extend the reference to earlier Saga platforms. PW-861069 is the companion OE reference supplied under the same Bonpora number. Because one bump stop reference can serve several platforms, and because repair shops sometimes fit alternative numbers during earlier repairs, we recommend verifying fitment in one of three ways before ordering:

1. Check the OE number molded or printed on the original bump stop removed from the vehicle.
2. Look up the reference in a parts catalog, using the model, model year, and trim level of the vehicle.
3. Send us the details — model, year, or a photo of the old part together with its dimensions — and our team will confirm the correct reference.

Where a catalog reference is not available, compare the three key dimensions of the old part — inner diameter, outer diameter, and height — with the values in the specification table above. This simple check prevents the most common cause of returns in the suspension parts trade: ordering by appearance alone without checking dimensions or OE references.

Symptoms of a Worn Strut Bump Stop

Common Warning Signs

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

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

When Should the Part Be Replaced?

Many workshops inspect bump stops whenever struts or shock absorbers are replaced, and replace them in pairs on the same axle so that compression behavior stays balanced from side to side. Reusing a heavily compressed or hardened bump stop with a new damper is generally not advised, because 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 repair part and as an accompanying item when workshops rebuild complete strut assemblies.

Why Choose Polyurethane for Bump Stops?

Original bump stops and many aftermarket equivalents are molded from rubber or micro-cellular foam. Bonpora produces 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 outer diameter and height consistent, which matters when the part slides onto the piston rod during assembly.

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

Ordering from a China Strut Bump Stop Supplier

Order by OEM Number

The fastest route for buyers is to reference the OE number directly: searching PW-861069 or PW-922648 locates this product in our catalog. When sending an inquiry, include the OE number or the Bonpora number (4110066), the required quantity, and the destination port or country, so that the sales team can quote freight accurately.

OEM Branding and Custom Manufacturing

Beyond catalog supply, Bonpora offers OEM and custom design support for suspension 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 strut 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 the 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.

FAQ: Strut Bump Stop PW-861069 / PW-922648

What vehicles does the PW-922648 bump stop fit?

PW-922648 is a Proton parts reference, and in the aftermarket it is commonly listed as the front absorber stopper for Proton Iriz, Persona VVT, and Saga VVT applications. Confirm the number on the original part, or send the vehicle details for verification before ordering.

What is the difference between PW-861069 and PW-922648?

Both references are supplied under Bonpora No. 4110066 in polyurethane, size Φ18.7 × Φ58.1 × 80 mm. PW-series numbers belong to the Proton parts system; always check the number and the dimensions of the part fitted on the vehicle before ordering.

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

Yes. Neutral export packaging is the standard option, and OEM branding and custom design support is available, including production to customer 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.

Looking for a reliable source of Proton strut bump stops? Request a quotation for Bonpora No. 4110066 (OE PW-861069 / PW-922648) with the target quantity, or send a drawing to discuss a custom polyurethane program — contact our sales team today.