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Strut bump stop 546261D000 is a polyurethane suspension cushion produced in China by Bonpora for Kia strut assemblies, and supplied to wholesale buyers, importers, parts distributors and independent workshops worldwide. The reference carries Bonpora number 4110175 and cross-references OE number 546261D000 from the Kia suspension catalogue. This page explains the function of the component inside a strut, sets out the complete published technical data, and covers the commercial points trade buyers ask about most often - volume pricing, OEM and custom support, packaging, warranty and delivery - so a first enquiry can be prepared precisely and answered without a long exchange of messages.
A strut bump stop, also listed as a jounce bumper, bump rubber or auxiliary spring, is the progressive elastomer element fitted on the piston rod of a strut. It works in the last part of the suspension stroke: when a wheel drops into a pothole, crosses a sharp ridge, or the vehicle carries more weight than usual, the cushion compresses and stiffens progressively, absorbing the travel that remains before the damper reaches metal-to-metal bottoming. In doing so it shields the damper, the top mount and the surrounding body structure from peak shock loads. Once the cushion has flattened, cracked or crumbled, comfort at full compression falls away and the damper wears faster - which is why professional workshops treat this low-cost part as a routine service item rather than an optional extra.
The bump stop slides over the damper piston rod between the top mount and the dust boot, working alongside the protective sleeve on most assemblies. Reference 546261D000 reproduces the original geometry of the Kia part: a bore of approximately 18.8 mm seats over the damper rod, the 51 mm outer diameter forms the contact surface inside the strut housing or spring seat area, and the 80 mm free height provides a progressive compression stroke of useful length. Those proportions describe a medium-bore cushion of moderate height, a layout that suits compact and mid-size passenger cars where the cushioning distance is shorter than on a large load-carrying vehicle. When cross-referencing between related numbers, confirm all three dimensions against the removed part rather than relying on outward appearance, because a cushion with a different bore or free height will engage at the wrong point of travel and behave quite differently in service.
Polyurethane bump stops usually fail gradually rather than without warning. Symptoms reported by workshops include knocking or thudding over sharp impacts, a noticeably harsher ride whenever the suspension reaches full compression, and visible cracking, powdering or permanent flattening found once the strut is opened for service. Because the part sits hidden inside the assembly, most technicians inspect or renew it whenever a strut, top mount or dust boot is replaced anyway. Fitting cushions in pairs on the same axle keeps both sides of the suspension balanced, and the modest unit cost makes renewal the simplest way to protect a new damper from repeated bottoming damage.
The published parameters for Bonpora reference 4110175 are summarised in the table below.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| OE Number | 546261D000 |
| Bonpora Nos | 4110175 |
| Fitment | Kia |
| Size | Φ18.8 × Φ51 × 80 mm |
| Material | Polyurethane (micro-cellular) |
| Country of Origin | China |
| Warranty | 1 year |
| Delivery Time | 15-30 days |
| Packaging | Neutral export packaging |
| Custom Service | OEM & custom design support |
The table also explains why this reference is easy to confuse with cushions from neighbouring model lines: bore, outer diameter and free height are all close to the dimensions of other Kia and Hyundai suspension references, so a match should always be confirmed on measurement as well as on the printed number.
In the Hyundai and Kia part numbering convention the leading digit group identifies the functional area of the vehicle, and 54626 belongs to the front suspension component family covering strut cushions and related hardware. The trailing characters encode the model application and the revision level of the part, so two numbers that share the 54626 prefix can still differ in bore or free height. The letter inside the reference signals a production or design variant, which is why buying on the complete number matters: a shortened or mistyped number can point to a cushion that will not seat correctly on the damper rod. Applications also change between model years, engines, trim levels and suspension options, so the number printed or stamped on the original part remains the decisive identification detail. When the marking on a removed sample has worn away, send the three measurements together with any surviving digits, or a photograph of the complete strut, so the correct reference can be verified before production is scheduled.
Many professional buyers source suspension elastomer parts by type and measurement rather than by vehicle model - for example a strut bump stop with an 18.8 mm bore and a 51 mm outer diameter, or a moulded polyurethane cushion with a free height near 80 mm. Specification-based sourcing suits bump stops well, because the three dimensions largely decide whether a replacement seats on the rod and engages at the intended point of travel. Measure the inner diameter, outer diameter and free height of the removed component, record the material and the Shore hardness where a datasheet is available, then compare those values with catalogue data. The polyurethane bump stop catalogue lists references together with their dimensions and OE numbers, so a cross-check can be completed in a few minutes before an enquiry is sent.
The three dimensions do different jobs, and all three need to match. The bore decides whether the cushion seats firmly on the piston rod without play, and it also influences how the stop is retained inside the assembly. The outer diameter governs the contact surface and must clear the surrounding spring seat or strut housing through the full range of movement. The free height sets the point in the stroke at which the cushion begins to work: too short and the damper bottoms out earlier than designed, too long and usable travel is reduced, so the suspension feels harsh over normal road inputs. Keeping all three values close to the original specification preserves ride quality and protects the damper, which is why reputable suppliers publish dimensions rather than numbers alone.
For buyers who work from vehicle data rather than from measurements, a simple three-step workflow keeps enquiries accurate:
The same workflow applies to single-reference orders and to mixed containers that combine bump stops with other suspension components.
Bump stops look simple, yet their behaviour depends on details that are easy to get wrong. Production at the Bonpora factory follows a control plan that trade buyers can audit at any time. Incoming polyurethane raw material is checked per batch for density and viscosity before it enters the mixing line. During foaming, cell structure and density are monitored so that the progressive spring rate stays inside the agreed band. Finished parts pass first-article and in-line dimensional inspection against the drawing - bore, outer diameter and free height are measured on every production lot, and Shore hardness is sampled at defined intervals. Compression set and fatigue tests run on a scheduled cycle to confirm that the cushion keeps its rebound behaviour after repeated strokes. Packaging is checked last, so parts leave the factory clean, dry and protected against deformation in transit.
Bonpora manufactures polyurethane suspension components in China and exports them to distributors, chain stores and workshops across Europe, North America, South America, the Middle East and Southeast Asia. Buying factory-direct removes intermediary margins and puts the buyer in direct contact with the team that controls tooling, material and inspection. Standard references such as 546261D000 run on existing tooling, which keeps minimum order quantities moderate and lead times predictable at 15-30 days depending on volume. Every order ships in neutral export packaging, so distributors can retail the parts under their own brand, and OEM or custom design support is available for buyers who need a derivative geometry, a different hardness or private-labelled packaging. The wider shock absorber parts programme covers the companion components of the strut, allowing mixed orders to be consolidated into a single shipment with one set of export documents.
Around every bump stop sit the parts that age with it: top mounts, dust boots, rebound buffers and strut accessories. Workshops that service a strut normally renew the elastomer set together, and distributors therefore stock these references side by side. Buyers assembling an assortment for Kia applications can combine this reference with related suspension items in one purchase order, and the custom parts service extends the same supply model to references that are not yet in the standard catalogue - drawings or samples in, quotation and prototype out. Consolidating an assortment with a single factory also simplifies quality management, because material behaviour and inspection standards remain identical across the range.
The 54626 prefix belongs to the front suspension cushion family used across several Kia passenger car lines. Because applications changed between model years, engines and trim levels, always confirm the fitment against the chassis number, an electronic parts catalogue or the removed part before ordering. The sales team can assist with application checks when buyers send the VIN together with the enquiry, and matching on the three dimensions remains the most reliable confirmation method.
The reference is moulded in micro-cellular polyurethane, a closed-cell elastomer foam that compresses progressively instead of bottoming abruptly. Compared with conventional rubber, polyurethane offers better resistance to compression set, ozone and aging, and it holds its density and hardness more consistently from batch to batch. In practice this means the cushion keeps its rebound behaviour for longer, and replacement intervals become easier to predict for workshops and fleet operators.
Yes. Sample orders are the recommended first step for new buyers. A sample of reference 4110175 can be shipped quickly for dimensional verification against the removed part, and the sample cost is normally credited against the first bulk order. Checking bore, outer diameter and free height on a physical sample takes only a few minutes and removes most of the risk from a first container order.
Every order ships in neutral export packaging suitable for onward distribution under the brand of the buyer. Standard production lead time is 15-30 days depending on order volume, and OEM or custom design projects are quoted separately with a dedicated timeline. The reference carries a 1-year warranty covering material and manufacturing defects. Payment terms, freight options and volume price breaks are confirmed in writing with every quotation.
Ready to source 546261D000? Send the OE number, the three dimensions and the target quantity through the contact page, and the Bonpora sales team will reply with unit pricing, sample arrangements and a delivery schedule - typically within one working day. Wholesale buyers, importers and workshop chains are all welcome, and OEM enquiries are handled directly by the engineering team.
