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When a workshop flags a collapsed or crumbling cushion on the strut rod, the replacement part has to match the original in three ways: the OE reference, the compressed height, and the material hardness. This guide covers the strut bump stop that cross-references OE PW922931, Bonpora reference 4110067, and explains how purchasing teams in Japan, the Middle East and Latin America source it directly from a Chinese factory.
A strut bump stop is the progressive cushion fitted on the damper rod inside the coil spring. It limits upward suspension travel before the strut bottoms out and absorbs the hardest part of that movement. On Mitsubishi and Nissan passenger cars, the original part also locates the dust boot, so grit stays away from the rod seal.
When the cushion degrades, the symptoms are easy to recognise during a lift inspection: a hard knock over speed bumps, a jolting ride on broken asphalt, cracks or white powder on the cushion surface, and a strut mount that starts taking loads outside its design range.
The PW922931 reference is most often requested for Mitsubishi Lancer, Mirage and Attrage front strut assemblies, and for Nissan Sunny and Almera front suspension. Because the same cushion is used across several model years, buyers should confirm the strut part number on the vehicle rather than relying on the model year alone.
The table below lists the production specification for Bonpora 4110067. Polyurethane is specified instead of plain cellular foam because it keeps its shape and hardness far longer under repeated compression, which matters on vehicles running on mixed road surfaces.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| OE Reference | PW922931 |
| Bonpora No. | 4110067 |
| Fitment | Mitsubishi and Nissan front strut assemblies |
| Outer Diameter | 60 mm |
| Inner/Height | 20.9 mm bore, 80.5 mm height |
| Material | Polyurethane |
| Warranty | 1 year |
| Delivery Time | 15-30 days |
| Packaging | Neutral export packaging |
| Custom Service | OEM and custom design support |
The original equipment part on many Asian platforms is microcellular foam. It is light and cheap, but it hardens with age and heat, then crumbles. Polyurethane keeps a more stable compression curve, resists oil and ozone, and can be moulded to a target shore hardness. That is why fleet and workshop buyers increasingly ask for polyurethane versions of common OE references.
Standard production for PW922931 runs in polyurethane at a hardness matched to the OE feel. For custom projects, suppliers can mould alternate hardness values, colours, and length variations to suit a specific spring and damper combination. Buyers working on a modified suspension often need exactly this flexibility.
Procurement teams handle this purchase in a predictable sequence. Getting the sequence right is what separates a smooth repeat order from a quality dispute.
Send the OE reference, the vehicle model and the strut part number. A supplier should confirm the cross-reference before quoting, not after. For this reference the matching numbers are PW922931 and Bonpora 4110067.
Ask for a drawing showing outer diameter, bore, height and any step on the profile. Dimensional tolerance on a bump stop is tight because the part must slide onto the rod and seat inside the spring without binding.
A pre-production sample lets the buyer compare compression feel against the original part before committing to a batch. This is the cheapest quality control step available.
Neutral export packaging is standard, and private label printing can be arranged. Confirm carton quantity and carton weight early, because freight cost per unit depends on it.
| Channel | Typical Strength | Typical Limitation |
|---|---|---|
| Chinese factory direct | Low unit cost, custom moulding, OE cross-reference support | Requires a clear drawing and a sample step |
| Regional distributor | Short lead time, local stock | Higher unit price, limited custom options |
| Local aftermarket brand | Easy ordering, catalogue support | Material grade often unspecified |
For a suspension cushion, three checks matter most. First, dimensional check against the agreed drawing. Second, hardness check on a sample from the batch. Third, a compression test to confirm the part returns to shape. Asking for these three records with the pre-shipment photos is a reasonable request that most export-oriented factories can meet.
Buyers sourcing a bump stop usually need the surrounding parts at the same time. If you are building a complete front strut kit, it helps to review the full range of polyurethane bump stops and the wider set of shock absorber parts available for export. Teams also working on bushings and link components can look through the chassis and suspension category to consolidate several items into one shipment.
The reference is used across front strut assemblies on several Asian platforms, including Mitsubishi and Nissan models. The safest approach is to confirm against the strut part number on the vehicle, not the model year alone. If you send us both numbers, we confirm the cross-reference before quoting.
Yes. Polyurethane can be moulded to a range of hardness values and lengths. If your application needs a firmer cushion for a heavier vehicle or a shorter part for a lowered suspension, a custom tool can be discussed. Custom service is offered alongside standard OEM and replacement production.
Lead time for standard production is typically 15-30 days after drawing and sample confirmation. Minimum order quantity depends on whether an existing tool can be used, so it is best to confirm with the specific reference and target quantity in hand.
Parts ship in neutral export packaging, with private label options available. A 1 year warranty is provided against manufacturing defects, covering material and moulding faults under normal use.
Send the OE reference, vehicle model, target quantity and any drawing you already have. We will confirm the cross-reference, quote unit price by quantity band, and share sample timing. For custom or private label projects, include the required hardness, colour and packaging details so the quotation is complete on the first round.
