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The OE 31331096298 (31 33 1 096 298) is the front suspension strut bump stop of the first generation BMW X5, the E53 built from 2000 to 2006. BMW lists the part as a rubber buffer in the front axle catalogue, one piece per front spring strut, two per vehicle, covering the petrol and diesel versions of the model. The same reference is quoted by Febi Bilstein as 26104 and by a wide list of European aftermarket brands. This page presents Bonpora No. 4110125, a polyurethane replacement manufactured in China for wholesale export, nominal size Φ23.5 x Φ66 x 95.5 mm.
The E53 X5 carries a double pivot spring strut front axle derived from the E38 and E39 saloon platforms and enlarged in steel for heavier use. One strut per side holds the coil spring, the damper and the bump stop. The 31331096298 buffer slides onto the damper rod inside the spring, above the dust boot and below the top mount. As the wheel travels upward over a pothole or during a fully loaded descent, the stop is progressively crushed and absorbs the last part of the compression stroke. It cushions the contact between the piston rod top, the spring seat and the body structure, prevents a harsh metal to metal knock, and protects the damper seal and internal valves from overload peaks.
The stop takes part in every full compression event, so it ages with mileage. Polyurethane hardens with time and heat, takes a permanent set under load and can crumble at the edges. A flattened stop shortens the working travel of the front suspension, and the symptoms follow: a hollow knock from the front over sharp bumps, a ride that turns harsh when the X5 carries passengers and luggage, and faster wear on the dampers and top mounts. Workshops inspect the bumper whenever a front strut, spring or dust boot is removed. Replace in pairs so both sides keep the same working height.
BMW built the E53 X5 in one body style, all wheel drive only, and the front axle layout stayed the same across the run. The table below summarises the engine versions named by the OE and aftermarket application lists; build date, market and equipment can shift coverage, so the number on the removed original or a VIN check remains the final word.
| Model | Engine | Power | Production Years |
|---|---|---|---|
| BMW X5 3.0i | M54B30 | 231 hp | 2000 - 2006 |
| BMW X5 3.0d | M57D30 | 184 hp, 218 hp from 2003 | 2001 - 2006 |
| BMW X5 4.4i | M62B44 | 286 hp | 2000 - 2003 |
| BMW X5 4.4i | N62B44 | 320 hp | 2003 - 2006 |
| BMW X5 4.6is | M62B46 | 347 hp | 2001 - 2003 |
| BMW X5 4.8is | N62B48 | 360 hp | 2004 - 2006 |
Three boundaries keep this reference clean. First, the axle: 31331096298 belongs to the front axle, and the rear suspension of the E53 takes separate references, so a rear axle request needs its own number. Second, the suspension variant: the BMW specialist trade lists this stop for cars without self levelling suspension, and factory self levelling equipment can move the application to another reference, so confirm the build code or the removed part before release. Third, catalogue noise: some databases tag the OEM number under additional marques, and several protection kits quote the number together with the dust boot. When sources disagree, order by the OE number on the removed part.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Country of Origin | China |
| Bonpora Nos | 4110125 |
| OE | 31331096298 |
| Fitment | BMW X5 (E53) |
| Size | Φ23.5xΦ66x95.5 |
| Material | Polyurethane |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
The Febi 26104 catalogue sheet, the main European equivalent, lists an inner diameter of 21 mm, a length of 95 mm and a weight of 0.080 kg. The Bonpora drawing reads Φ23.5 x Φ66 x 95.5 mm at its own reference points. Differences of this scale between catalogues are normal for elastomer parts, because each brand measures at different stations and a stop measured free in the hand sits taller and wider than one compressed on the rod. Weight lands near 0.08 kg per piece, which keeps freight cost low for container planning. Match the new stop against the removed original before releasing a full batch, and record bore, outer diameter and height in the quotation.
The OE part and the main aftermarket equivalents are produced in microcellular polyurethane or conventional rubber. The material decides how the stop behaves across years of compression cycles, oil contact and weather.
| Property | Polyurethane | Conventional Rubber |
|---|---|---|
| Compression set | Low; working height is retained after repeated impacts | Higher; flattens with age and load cycles |
| Oil and grease resistance | Good | Limited; swells and softens on exposure |
| Ozone and UV resistance | Good | Limited; surface cracking over time |
| Temperature behaviour | Stable across a wide range | Hardens in cold, softens in heat |
| Load consistency | Nominal rate holds between batches | Varies more with age and temperature |
| Typical role | Primary replacement line for export stock | Standard duty, price driven demand |
Rubber remains serviceable in mild climates and standard duty. Polyurethane keeps its working height longer under repeated compression, which decides how soon a loaded X5 starts to knock at the front axle.
European and North American distributors usually restock polyurethane as the primary replacement line because it matches the OE material family. Price driven tenders in some regions still call for rubber versions. Bonpora produces the polyurethane line as standard and can quote rubber on request against the same drawing.
Ordering by OEM number is the most reliable route when the marking on the removed part is still readable. The number appears as 31331096298, 31 33 1 096 298 or 3133 1096 298 depending on the catalogue, and all of the forms identify Bonpora reference 4110125. For orders that span more BMW platforms, the polyurethane bump stops range groups references by system and model family and shortens the quotation process.
This bumper is manufactured in China for wholesale distribution as a catalogue item with existing tooling, priced for carton, pallet and container quantities. Typical buyers include BMW specialists, suspension parts importers and distributors serving independent workshops across Europe, the Middle East, Southeast Asia, Latin America and Africa. Because one reference covers the complete E53 run from the 3.0i to the 4.8is, one pallet position serves every petrol and diesel version at the same time. Orders ship in neutral export packaging by default, delivery takes 15 to 30 days depending on volume, the warranty period is 1 year, and samples can be arranged to verify bore, height and hardness before a bulk commitment.
Each production batch is checked for bore, outer diameter, overall height and material hardness, with visual inspection for flash, voids and surface defects. Dimensional records are kept per batch, so repeat orders match the approved sample. That traceability supports the 1 year warranty.
Beyond the catalogue part, the same production line supports OEM and custom design work: adjusted hardness, modified bore, outer diameter or height, coloured material, branded packaging and private label marking. For a custom project, send a drawing or a sample together with the expected annual volume; a first article sample confirms the fitment before series production begins.
The workflow is simple: drawing review, material and hardness proposal, first article sample, vehicle fitment check on the sample, then batch production with per batch inspection records. Most custom projects move from drawing to approved sample within a few weeks.
Replace the front bump stops in pairs and inspect the dust boots, the top mounts and the front dampers at the same visit, because leaking damper oil is the fastest route to a destroyed buffer. The work happens at the strut assembly: the coil spring is compressed with a proper spring compressor, the old stop is released from the damper rod, the rod surface is cleaned, and the new stop is pushed fully home against its shoulder before the boot is located. A light coating of grease on the mating surfaces eases assembly, and a stop seated unevenly wears on one side, so check the seating before the strut goes back into the vehicle.
The front axle of the first generation BMW X5, chassis code E53, built from 2000 to 2006: X5 3.0i with the M54 engine, X5 3.0d with the M57 diesel, X5 4.4i with the M62 and later N62 engine, X5 4.6is with the M62B46 and X5 4.8is with the N62B48. One piece per front strut, two per vehicle, listed for cars without self levelling suspension. A VIN check or the number on the removed part confirms the order.
Yes for sourcing purposes. Febi 26104, SWAG 20 92 6104, MAPCO 32870, VAICO V20-0040, Ruville 835004 and several other catalogue numbers are published aftermarket equivalents for OE 31331096298, all describing the same front axle rubber buffer for the X5 E53. Bonpora supplies the application as reference 4110125 in polyurethane.
No. The 31 33 number group places the part in the front axle shock absorber catalogue, and the rear suspension of the E53 takes separate references. Applications published by Febi and the BMW specialist trade point to the E53 X5 only; requests for other models or the rear axle should be checked by VIN and quoted under the correct number.
Yes. OEM and custom design support covers adjusted hardness, modified dimensions, coloured material and private label packaging. Delivery time is typically 15 to 30 days depending on quantity, packaging is neutral export with branded options on request, and the warranty period is 1 year. Send a drawing or a sample with the target annual volume to receive a quotation.
Send the OEM number 31331096298, the Bonpora number 4110125, the quantity and the destination port, and the sales team will confirm specification, packing and delivery schedule. Buyers building a wider suspension programme can review the chassis and suspension parts range, and the full auto parts line covers rubber, steering and chassis components from the same factory.
