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A strut bump stop is a small suspension buffer that takes the last part of the strut travel, so the piston rod and the top mount never meet metal to metal. This page covers the Strut Bump Stop with OE reference 48331-33032 and Bonpora No. 4110069, a polyurethane buffer produced in China for Lexus and Toyota passenger cars.
The bump stop fits over the piston rod, inside the dust boot, between the spring seat and the top mount. Once the suspension runs out of normal travel the stop is compressed and the load rises quickly. Because polyurethane compresses progressively, the part behaves like a secondary spring: soft on first contact, then firm. That curve is what keeps the damper and the body structure away from a hard bottom-out.
When the stop is missing, cracked, or permanently squashed, the strut bottoms out. Drivers report a heavy knock over speed bumps, a floaty or bouncy ride, and extra noise from the top mount bearing. For a workshop or a distributor, a bump stop is one of the lowest-cost items to renew while the strut is already off the vehicle.
On a front MacPherson strut the stop slides down the piston rod and sits under the dust boot. Rear strut layouts are similar, although on some models the stop is combined with the dust sleeve. Confirm the axle position and the strut design of the exact Lexus or Toyota model before ordering.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Country of Origin | China |
| Bonpora Nos | 4110069 |
| OE | 48331-33032 |
| Fitment | Lexus, Toyota |
| Size | Φ21.6 x Φ50.4 x 92 mm |
| Material | Polyurethane |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
The size note Φ21.6 x Φ50.4 x 92 mm describes a stepped cylindrical body: a 21.6 mm inner bore that fits over the piston rod, a 50.4 mm maximum outer diameter, and a 92 mm free length. Buyers should compare all three figures against the original part, because even a small change in free length moves the point at which the stop starts to work.
Polyurethane is chosen ahead of standard rubber for its resistance to oil, ozone, and repeated compression. It holds its shape longer under load, which matters on vehicles that often carry a full load or run on rough roads.
Sourcing by OEM number is the fastest route when the original part is still readable. The number 48331-33032 identifies this bump stop for the listed Lexus and Toyota applications. Alongside the OE number we publish an internal Bonpora number, 4110069, so distributors and repeat buyers can reorder the identical specification without re-checking the drawing. The wider auto parts catalogue groups these references by system and by vehicle.
If the OE number has worn away, identify the part by vehicle instead: model, model year, engine, and front or rear axle. Providing the VIN removes ambiguity between trim levels that use different strut hardware.
Beyond standard production, this bump stop can be supplied as an OEM or custom design. Options include tailored polyurethane hardness, adjusted free length, branded packaging, and private-label marking. Distributors serving a specific vehicle fleet often combine several suspension items in one shipment to lower freight cost per unit. Our suspension parts range lists the components usually ordered together, such as dust boots, top mounts, and spring seats.
For a custom project, send the 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 run starts.
Each batch is checked for bore diameter, outer diameter, free length, and hardness. Visual inspection covers flash, voids, and surface defects that could lead to early cracking. Dimensional records are kept so repeat orders match the approved sample.
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 stop usually means the strut has been bottoming out, so check the damper for oil loss before refitting. Torque the top mount nut to the figure given by the vehicle maker, with the suspension at normal ride height where the design calls for it.
A polyurethane stop should seat fully on the piston rod shoulder. If it does not sit flat it will wear unevenly and may generate noise within a short mileage. Related hardware such as strut mounting components should be renewed rather than reused if corroded.
Typical signs are a hard knock over speed bumps, a bouncy or unsettled ride, and visible cracking, crumbling, or permanent compression of the stop. If the strut has been bottoming out, inspect the damper for oil seepage at the same time.
Not always. Fitment depends on the specific Lexus or Toyota model and axle. Confirm the position and the strut layout, then match the bore, outer diameter, and free length of the original part.
Yes. OEM and custom design support is available, including adjusted polyurethane hardness, modified free length, and private-label packaging. Send a drawing or sample with the target annual volume for a quotation.
Delivery time is typically 15-30 days depending on quantity and whether tooling is required. Packaging is neutral export packaging by default, with branded options available on request.
Send us the OEM number 48331-33032 or the Bonpora number 4110069, the quantity, and the destination port. We will confirm specification, packing, and delivery schedule. For buyers who compare several sources, our full auto parts line covers suspension, steering, and engine components from the same factory.
