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The strut bump stop on a Hyundai or Kia front axle is a polyurethane cushion fitted over the strut piston rod inside the front strut assembly: it compresses when the front suspension reaches full compression and prevents hard metal-to-metal contact between the strut rod, the upper mount, and the strut body. This page presents the Strut Bump Stop with OE reference 54626-C1050 and Bonpora No. 4110211, a polyurethane front strut bumper produced in China for Hyundai and Kia applications such as the Sonata (LF generation, 2015-2019), the Optima and Optima Hybrid (2016-2020), the K5 (2021-2024), and the Cadenza (2017-2020). The sections below cover the working principle, the dimensions and material of this reference, sourcing by OEM number, wholesale supply from a Chinese auto parts factory, custom manufacturing support, and fitting notes for workshops, importers, and parts distributors searching for Hyundai and Kia strut bumper replacement parts.
In normal driving the coil spring carries the vehicle weight and the strut damper controls how quickly the body moves. When the front wheel drops into a deep pothole or hits a sharp expansion joint at speed, the remaining travel of the suspension is used up almost instantly. At that moment the bump stop is compressed between the strut piston rod and its upper seat. Polyurethane compresses along a progressive curve, so the part behaves like a secondary spring: the response is soft at first contact and grows steadily firmer as compression increases. This staged absorption takes the final phase of the impact and protects the strut rod, the upper mount, and the surrounding chassis structure from a hard bottom-out.
Hyundai and Kia fitted this type of front strut bumper across the mid-size platform family shared by the Sonata LF, the Optima JF, and the following K5, as well as the larger Cadenza. These sedans carry family loads, run long highway distances, and in many export markets operate on rough secondary roads, so the front stops compress many times every day. Once the buffer is worn, cracked, or crushed flat, the strut reaches the end of its stroke with no cushion. Drivers notice a sharp knock over speed bumps, a harsher front end over broken pavement, and extra noise transferred into the cabin. For workshops the stop is one of the lowest-cost parts to renew while the strut is already removed, and for distributors it is a fast-moving wear item with steady repeat demand in export markets.
The prefix 54626 in Hyundai and Kia part numbering identifies the front spring bumper family, and catalogue listings for 54626-C1050 cover a wide run of mid-size applications: the Hyundai Sonata LF (2015-2019), the Kia Optima and Optima Hybrid including the plug-in variant (2016-2020), the Kia K5 (2021-2024) with the 1.6 litre engine, and the Kia Cadenza (2017-2020), with further variants depending on market and build date. The part mounts one per side on the front strut, and it is often supplied together with the strut assembly at the factory. Before ordering, confirm the exact application by model, chassis code, model year, engine, and market, or measure the bore, outer profile, and free length against the removed original part. Sending the VIN or chassis number to the supplier removes nearly all ambiguity before a quotation is prepared.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Country of Origin | China |
| Bonpora Nos | 4110211 |
| OE | 54626-C1050 |
| Fitment | Hyundai/Kia |
| Size | Φ27xΦ59x70 |
| Material | Polyurethane |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
The size listing Φ27 x Φ59 x 70 mm describes a mid-format front stop: a 27 mm bore that slides over the strut piston rod or the dust cover core, an outer diameter of about 59 mm, and a free length of 70 mm. The free length sets the point at which the stop begins to work inside the strut, while the bore must match the rod or the dust cover core over which the stop slides. A stop that is too long preloads the suspension and can alter ride height and handling; one that is too short lets the strut bottom out early and passes the impact straight into the body. Because the factory revised suspension details across the production life of these platforms, measuring the removed original part before ordering remains the safest practice, particularly for workshops that service several model years.
Polyurethane is selected ahead of ordinary rubber for this product family because it resists oil, ozone, road salt, and repeated compression cycles far better. It holds its shape under sustained load, which matters on front axles that carry engine weight and absorb braking energy, and it stays consistent in hot and humid climates where rubber buffers tend to harden and crumble early. For distributors, the longer service life of polyurethane also means fewer warranty claims from end customers and more stable repeat business on the same part number.
Sourcing by OEM number is the most reliable route when the original part is still legible. The number 54626-C1050 identifies this front strut bumper in Hyundai and Kia parts listings, and it maps to a single Bonpora No. 4110211, so distributors and repeat buyers can reorder one specification without checking drawings every time. For mixed orders that span several product groups, the auto parts catalogue organises references by system and by vehicle model, which shortens the quotation workflow considerably.
If the OE number has worn away, identify the part by vehicle data instead: brand, model, chassis code, model year, axle position, and strut design. A photograph of the removed part beside a ruler, together with the VIN, lets the supplier confirm the match before shipment. Workshops that service Sonata, Optima, K5, and Cadenza models across several model years can consolidate their bump stop stock under Bonpora numbers, keeping one part code per application and simplifying reordering across the entire customer base.
This bump stop is manufactured in China for wholesale distribution. It runs as a catalogue item, which means the tooling already exists, dimensions stay stable between production batches, and pricing is structured for carton, pallet, and container quantities rather than single-piece retail. Typical buyers include importers of suspension and rubber components, national and regional distributors serving export markets, fleet maintenance operators, and online sellers who need a dependable source for Hyundai and Kia fast movers. The suspension and rubber parts range from the same production site covers companion items that are usually ordered together, such as strut mounts and dust boots, so a container can be built around complete repair kits instead of single references.
Orders ship in neutral export packaging by default, so goods arrive ready for relabelling under the own brand of the distributor. Delivery time is 15 to 30 days depending on order volume and production scheduling, and the warranty period is 1 year. For first-time customers, sample quantities can be arranged before a bulk commitment, so fitment can be verified on real vehicles before the container is booked.
Each production batch is checked for free length, outer profile, and material hardness. Visual inspection covers flash, voids, and surface defects that could lead to early cracking in service. Dimensional records are kept per batch, so repeat orders match the approved sample rather than drifting over time. This batch-level traceability is one of the reasons the part can be offered with a 1-year warranty for export markets.
Beyond the catalogue part, the same production line supports OEM and custom design work. Available options include tailored polyurethane hardness, adjusted free length or outer profile, coloured material for brand recognition, branded packaging, and private-label marking. Distributors serving a defined vehicle parc often combine several suspension items in one shipment to reduce the freight cost per unit. For a custom project, send a 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 production run starts.
Replace front bump stops in pairs, one per side of the axle, and inspect the dust boot, the upper mount, and the spring seat at the same time. A collapsed or crumbling stop usually indicates that the strut has been bottoming out, so check the strut assembly for oil loss before refitting. On the Sonata LF, the Optima JF, the K5, and the Cadenza the stop sits directly in the load path of the front suspension, so torque the upper fasteners to the figure given by the vehicle maker and confirm that the stop is fully seated on the rod before the wheel goes back on.
A polyurethane stop should seat flat on the rod shoulder or the dust cover core. If it does not sit flat, it will wear unevenly and may generate noise within a short mileage. Because the buffer works behind the dust boot, a light coating of the grease specified by the vehicle maker makes future removal easier and reduces the chance of squeaking.
Catalogue listings for 54626-C1050 cover the Hyundai Sonata LF (2015-2019), the Kia Optima and Optima Hybrid including the plug-in variant (2016-2020), the Kia K5 (2021-2024) with the 1.6 litre engine, and the Kia Cadenza (2017-2020), at the front axle, one piece per side. Exact fitment depends on model, chassis code, model year, engine, and market, so confirm the application in the parts catalogue or send the VIN for a precise match before ordering.
Typical signs are a hard knock over speed bumps, a harsher ride at the front, and visible cracking, crumbling, or permanent compression of the old stop. Because the stop sits on the strut rod behind the dust boot, it should be inspected whenever a front strut is removed. If the strut has been bottoming out, check the damper for oil seepage at the same time, since a failed buffer often shortens damper life.
Yes. OEM and custom design support is available, including adjusted polyurethane hardness, modified bore, free length, or outer profile, coloured material, and private-label packaging. Send a drawing or a sample together with the target annual volume to receive a quotation and a sampling schedule.
Delivery time is typically 15 to 30 days depending on quantity. Packaging is neutral export packaging by default, with branded options available on request, and the warranty period is 1 year. Sample quantities and mixed-container loading with other suspension parts can be arranged for new customers.
Send the OEM number 54626-C1050, the Bonpora number 4110211, the quantity, and the destination port, and the sales team will confirm specification, packing, and delivery schedule. Buyers comparing several sources can review the full auto parts line, which covers suspension, steering, and engine components from the same factory under one catalogue.
