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A front strut bump stop is a small, low-cost item that decides how a front strut behaves near the end of its travel. When a buyer searches for OE 0344402 or 770044, the number comes from an Opel or GM catalogue, the car is known, and what matters is that the buffer seats correctly on the piston rod and still recovers after years of compression. This page sets out the specification we produce, the vehicles it covers, and the trade numbers it cross-references to.
The reference identifies a front axle suspension buffer, described across catalogues as a rubber buffer, jounce bumper or shock rubber stop. All of these name the same object: an elastomer ring that sits on the front strut piston rod and cushions the strut as it approaches full compression.
The part is fitted on the front axle on both sides, two pieces per vehicle. In service it is largely passive through normal travel, then takes up load quickly in the last part of the stroke. That limits metal-to-metal contact inside the strut, reduces the peak load passed to the top mount, and keeps the coil spring inside its working range.
General Motors used a group-wide reference system, so the same buffer carries a GM service number, 90125889, and an Opel catalogue code, 3 44 402, printed as 0344402 once the spaces are removed. The second number on this page, 770044, appears against the same front-buffer family in distributor data. A buyer holding either form is looking at the same component.
The table below lists the specification set we supply against this reference. When two quotations are compared, the inner diameter, the height and the elastomer grade are the three lines that decide whether the offers describe the same part.
| Product name | Strut bump stop (rubber buffer, jounce bumper, suspension buffer) |
|---|---|
| Reference OE number | 0344402 / 770044 |
| Bonpora No. | 4110083 |
| Fitment / application | Opel front axle, see fitment table below |
| Position | Front axle, both sides (2 pieces per vehicle) |
| Material | Polyurethane (PU) elastomer |
| Size | Φ20 x Φ60 x 45 mm (inner bore, body diameter, height) |
| 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 4110083 is our internal item code and is the fastest way to route an enquiry to the right production file. European aftermarket listings for this application commonly quote a 20 mm inner diameter and a nominal height of 45 to 46 mm, which sits inside the normal tolerance band for a moulded elastomer alongside our drawing value.
A lower price achieved by thinning the section, shortening the body or changing the hardness grade is not a like-for-like alternative. Each change alters how the buffer behaves in the final part of the stroke, which is the range it exists to protect.
Fitment is the first thing an overseas buyer checks, because a buffer listed against the wrong model produces returns rather than repeat orders. The reference is fitted on the front axle of the models below.
| Brand | Model and platform code | Notes |
|---|---|---|
| Opel | Kadett E (T85), including hatchback, saloon, Caravan, convertible, van and Combo | Front axle |
| Opel | Astra F (T92), including hatchback, saloon, Caravan and convertible | Front axle; also listed as Astra F Classic |
| Opel | Ascona C | Front axle |
| Vauxhall | Astra, Cavalier Mk2 | Front axle; same GM reference |
| Daewoo | Lanos, Nubira (J100), Espero (KLEJ) | Front axle; GM-derived platforms |
| Holden, Chevrolet, Pontiac, Buick | Commodore, Lumina, G8, GTO, J2000, Skyhawk | Front axle; GM group applications listed by cross-reference data |
The buffer was designed inside a GM platform family built and sold under several marques, so a distributor serving Opel and Vauxhall owners in one market, or Opel and Daewoo owners in another, can often cover several model ranges with one line item instead of three. For a slow-moving, low unit-cost part that reduces stock lines and simplifies consolidation.
Some applications above come from cross-reference data rather than a manufacturer fitment list, so treat that as a search aid. Quote the model, year and platform code, and we will confirm the reference.
Three variables decide whether the buffer is right for the job: axle position, whether the car carries standard or uprated suspension, and whether the old part is a bare buffer or part of a combined kit. Front and rear buffers are not interchangeable, and on later Astra generations the front buffer changed shape, so the platform code matters more than the model name.
The numbers below appear against this application in European aftermarket catalogues. They are listed to help you locate stock and sanity-check a quotation, not as a statement that every one is dimensionally identical.
| Number or brand reference | Status |
|---|---|
| 0344402 / 3 44 402 | Reference number used on this page |
| 90125889 | Equivalent General Motors service number |
| FEBI BILSTEIN 03101 | Aftermarket buffer listed for this OE number, PU, 20 mm bore, 46 mm |
| SWAG 40 56 0008 | Aftermarket buffer, 20 mm bore, 46 mm |
| LEMFORDER 21321 | Buffer listed for Opel Kadett, Ascona and Astra, front axle both sides |
| OPTIMAL F8-5710 | Buffer, front axle, 46 mm |
| MAPCO 32713 | Buffer, front axle both sides |
| TOPRAN 200 424 | Buffer, front axle left and right, 46 mm |
| FEBEST CHD-LEG | Buffer, front axle |
| VAICO V40-2016 | Buffer, front axle, 20 mm bore, 46 mm |
| ORIGINAL IMPERIUM 30383 | Buffer, front axle, 20 mm bore, 46 mm |
Third-party brand names are shown for identification only and imply no connection with those manufacturers. Send the number you hold, or a photograph of the old part beside a ruler, and we will confirm whether it matches before you order.
Polyurethane works well here because the formulation can be tuned. Adjusting the mix shifts hardness, rebound and compression set, so one body shape can serve a comfort-oriented hatchback or a heavier load case in the same platform. Compared with conventional rubber it resists tearing better, is less affected by oils and road salt, and holds its shape longer under repeated compression.
| Property | Polyurethane buffer | Conventional rubber buffer |
|---|---|---|
| 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, which covers replacement buffers and parts made to customer drawings.
The enquiry behind this part often comes from an importer evaluating a supply channel rather than shopping for a single number, which changes what a useful reply looks like.
An intermediary adds a margin layer between the buyer and the mould. Working direct means tolerances, hardness, packing and inspection criteria are agreed with the party that runs the press, so a requested change reaches production without being lost on the way. For a part with a low unit cost and steady turnover, that is usually worth more than a small difference in price.
Buffers of this profile are produced by casting or moulding, depending on geometry and hardness; the route is fixed at the sample stage because it sets tooling cost and the achievable tolerance band. Buyers auditing a supplier normally ask for the following, which we prepare to order rather than bundle automatically:
Listing these at enquiry stage avoids a delay at shipment, and buffers are commonly bought with other chassis parts so that freight cost per unit falls.
Purchasing 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 common and most precise route. A buyer searching for 0344402 or 90125889 knows the car and wants a direct replacement, so confirm the reference, the fitment list, the elastomer grade, and whether the item is ex-stock or produced to order.
Buyers without a number search by description, for example polyurethane front strut bump stop, 20 mm inner diameter rubber buffer, or 45 mm front suspension strut bumper. These enquiries are broader, so set out the platform coverage and ask for vehicle details or a sample.
Searches that begin with the car, such as front bump stop for Kadett E or strut buffer for Astra F, usually come from repair shops and smaller distributors. A clear fitment list and a cross-reference table keep those conversations short. Related components sit in our chassis and suspension range.
Importers often search for a China strut bump stop factory rather than for the part itself, because the real question is whether the channel is reliable. What answers it is capacity, production route, quality system, packing and lead time. Our shock absorber parts programme covers buffers 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, which needs a drawing or sample, an agreed hardness grade and a packing specification. See custom parts for what we need before quoting.
Because the buffer compresses before the strut reaches the end of its travel, it protects more expensive parts at the same time, limiting the peak load reaching the top mount and 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 strut or spring change, leaving a new damper beside a crushed original buffer and a repair that comes back. Replacing both sides at once is normal practice and cheaper for the end user.
It is listed for the front axle of Opel Kadett E (T85), Astra F (T92) and Ascona C, with the same GM reference appearing for Vauxhall Astra and Cavalier and for GM-derived Daewoo Lanos, Nubira and Espero. Because some of that coverage comes from cross-reference data rather than a manufacturer fitment list, send the model, year and platform code and we will confirm before you order.
Both appear against the same front-buffer family in distributor data, and the GM service number 90125889 covers the same application. Numbers issued through different catalogue systems are not automatically identical suppliers, so we confirm against the number you hold or a photograph of the old part rather than treating the two as freely interchangeable.
Our drawing holds a 20 mm inner bore, a 60 mm body diameter and 45 mm height in polyurethane. European aftermarket listings for this application commonly quote a nominal 45 to 46 mm height, so the difference sits inside the normal measuring convention for a moulded elastomer. Size is confirmed against the drawing revision at quotation.
Yes. Send a drawing with the key dimensions, or a physical sample for reverse engineering, together with the required hardness and 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, and any packing or documentation requirements. We will reply with the price, the confirmed application list and the delivery schedule. Quote Bonpora number 4110083 to route your enquiry to the correct production file.
