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A front axle bump stop is a small moulded elastomer that decides how a strut behaves in the last part of its travel. When a buyer searches for 1748393000, the number comes from a Volkswagen Group catalogue, the axle position is known, and the practical questions are whether the stop seats on the piston rod correctly, whether the height matches the spring package fitted to the car, and whether the offer in front of them is the same part rather than a look-alike. This page sets out the specification we supply against this reference, the platform it belongs to, the trade numbers it cross-references to, and how the height question is normally settled.
The part sits on the piston rod inside the front strut, under the dust boot and above the damper body. Through normal travel it is mostly idle, riding clear of the damper. In the last part of the compression stroke it engages and takes up load progressively, working as a secondary spring rather than a hard stop.
A stop that engages early makes the car feel harsh and shortens damper life; one that engages late allows the suspension to bottom out. On Group platforms the engagement point is tuned through height and density, which is why two visually similar stops are often not interchangeable.
The elastomer limits the peak load passed to the strut mount, the spring seat and the body structure, and reduces coil-to-coil contact on a compressed spring. That is why the part is normally replaced whenever a strut or spring is changed, rather than only when it is visibly broken.
The table below lists the specification set we supply against this reference. When two quotations are compared, the application list and the elastomer are the lines that decide whether the offers describe the same part.
| Product name | Strut bump stop (jounce bumper, shock absorber buffer, rubber buffer for suspension) |
|---|---|
| Reference OE number | 1748393000 |
| Bonpora No. | 4110088 |
| Fitment / application | Audi; Volkswagen Group platform, see platform notes below |
| Position | Front axle, both sides |
| Material | Polyurethane (PU) elastomer |
| Size | Φ21.1 x Φ55.28 x 65.8 mm (bore, body diameter, overall length) |
| Country of origin | China |
| Warranty | 1 year |
| Delivery time | 15-30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM and custom design support |
Bonpora number 4110088 is our internal item code, useful when requesting a sample or when the same part is quoted again later. The three dimensions describe the bore that slides over the piston rod, the body diameter of the moulding, and the overall height. A supplier who matches the reference but changes the height or the hardness grade is offering a different part, however close the price looks.
The number follows the Volkswagen Group numbering convention, in which the leading block identifies the platform family and the middle block the component group. Because several brands were built on shared platforms, a single stop serves Volkswagen, Audi, Seat and Skoda catalogues at the same time. Buyers should confirm the platform and the axle position rather than relying on the brand name alone.
| Item | Detail | Notes |
|---|---|---|
| Number group | Front suspension components | Confirms this is a front axle part, not a rear jounce bumper |
| Axle position | Front axle, left and right | Sold individually; two required per car |
| Typical adoption | Volkswagen Group passenger cars | Platform generations overlap, so confirm by reference number |
| Related group members | Dust boot, strut mount, coil spring | Usually replaced in the same repair |
Three details settle which stop applies: the axle position, the spring package fitted at the factory, and whether the car carries a sports chassis or a raised ride height. Where a catalogue offers several heights for one model, quote the model year, the vehicle identification number where it is available, and the reference number held on the old part.
The numbers below appear against this application in European aftermarket catalogues. Group supersession chains are common, so treat the table as a starting point for verification rather than as proof of identity.
| Number or brand reference | Status |
|---|---|
| 1748393000 | Reference number used on this page |
| 1J0412303 | Group front axle buffer widely listed against the same applications |
| 1J0412303B | Related Group buffer listed in the same OE grouping |
| 1H0412303B | Alternative Group buffer, generally listed at a greater height |
| 1JM412303 / 1JM412303A | Further Group references in the same family |
| BOGE 89-204-0 | Aftermarket buffer for this application family |
| LEMFÖRDER 21112 01 | Aftermarket buffer for this application family |
| FEBI BILSTEIN 106131 / 13001 / 13051 / 13076 / 18365 | Aftermarket numbers listed for this family |
| KYB 910088 / 915415 | Aftermarket numbers listed for this family |
Group catalogue numbering runs in families rather than single numbers, and only some of those numbers are true replacements for each other. Third-party brand names are shown for cross-reference only and imply no connection with those manufacturers. Send the number you hold, or a photograph of the old stop with a measurement of its height, and we will confirm the match before you commit to an order.
On this platform the same base reference is produced in more than one height because cars were built with different spring packages. Catalogues mark this with equipment codes, and the same car model can take a different stop depending on how it left the factory.
A distributor who stocks a single height for a whole model range will see fitment complaints from a minority of vehicles, usually those with a sports chassis or a raised suspension. The cost of a return is far higher than the cost of the part, so the height check belongs at the quotation stage rather than after delivery.
Send the model, the model year, the reference number from the old stop and, where possible, a photograph of the vehicle data sticker showing the suspension equipment codes. With that information we can confirm the height we hold against the car rather than against the model name.
Polyurethane is used for this class of part because the formulation can be tuned. Adjusting the mix shifts hardness, rebound and compression set, so one body shape can be produced for a comfort-orientated car or for a heavier load case. Against conventional rubber it resists tearing better, is less affected by oils and road salt, and holds its shape for longer under repeated compression.
| Property | Polyurethane stop | Conventional rubber stop |
|---|---|---|
| Repeated compression | Holds shape across the service interval | Tends to take a set earlier |
| Oil and abrasion resistance | Good | Moderate |
| Hardness options | Wide range, tuned per application | Narrower range |
| Load capacity in a small profile | Higher | Lower |
For the wider range of shapes and hardness grades we produce, see our polyurethane bump stops section, covering replacement stops and parts made to customer drawings.
Enquiries reach a supplier through a few predictable routes, and knowing which one the buyer used makes it easier to answer correctly in the first reply.
This is the most precise route. A buyer searching for 1748393000 already knows the application and wants a direct replacement, so confirm the reference, the axle position, the material grade, and whether the item is ex-stock or produced to order.
Buyers without a number search by description, for example front strut bump stop with a defined bore and height, or polyurethane shock absorber buffer sized to a drawing. Those enquiries are broader, so state the platform coverage and ask for a sample or the old part number.
Searches that begin with the car, such as front suspension buffer stop for a Golf or a jounce bumper for an Audi A3, usually come from workshops and smaller distributors. A clear application list and a cross-reference table keep the exchange short. Related items sit in our chassis and suspension range.
Importers often search for a China strut bump stop factory rather than for a single number, because the real question is whether the channel is dependable. Capacity, production route, quality system, packing and lead time are what answer it. For a long-term channel rather than a one-off order, our shock absorber parts programme covers stops alongside related suspension components.
Buyers who already hold a mould, a drawing or a competitor sample usually want the same geometry under their own brand. That requires a drawing or sample, an agreed hardness grade and a packing specification. See custom parts for what we need before quoting.
Because the stop compresses before the damper reaches the end of its travel, it limits the peak load reaching the mount and the body while keeping the spring inside its working range. Signs it has reached the end of its life:
Because the part is inexpensive it is often left in place during a spring or damper change, which leaves a new damper beside a crushed original stop and a repair that comes back. Replacing both together is normally the cheaper outcome for the end user. Always seat the stop fully on the piston rod and confirm that the dust boot is not trapped when the car is lowered.
It is a front axle component. On this platform front and rear stops are different parts and are not interchangeable, so it is worth confirming the axle position against the old part before ordering, particularly where a rear stop has been replaced in an earlier repair.
1J0412303 is the Group front axle buffer most widely listed against the same applications, and the two numbers appear together in the same OE grouping. We treat them as the same application family rather than as automatically interchangeable. Send the number you hold and we will confirm the match in writing.
Cars on this platform left the factory with different spring packages, including sports chassis and raised variants. The stop height is tuned to the package, so two cars of the same model and year can take different stops. Quoting the equipment codes from the vehicle data sticker removes the ambiguity.
Yes. Send a drawing with the key dimensions, or a physical sample for reverse engineering, together with the required hardness and the expected service conditions. We will confirm feasibility and the tooling route. OEM and custom design support is standard rather than a special arrangement.
If you are sourcing this reference for a workshop, a distribution programme or a private-label line, send the quantity, the destination port, the model and year, and any packing or documentation requirements. We will reply with the price, the confirmed application list and the delivery schedule. Quote Bonpora number 4110088 to route your enquiry to the correct production file.
