sales@bonporaparts.com
0086-10-64988621
English
Buyers searching for the Ford strut bump stop OE 1531648 usually need one of three things: a direct replacement for a worn front jounce bumper, a supplier who can quote the number at a stable factory price, or a manufacturer who can produce the same geometry under a private label. This page covers all three, with the dimensions, material data and fitment notes a purchasing team needs before raising a PO.
OE 1531648 is the front axle strut bump stop used on the Ford C1 platform family, most commonly the Focus and C-Max. It sits on the damper rod above the dust boot and stops the strut from bottoming out under full compression. Our factory number for this part is Bonpora No 4110172.
| Item | Specification |
|---|---|
| Product Name | Strut Bump Stop (Jounce Bumper) |
| OE Number | 1531648 |
| Bonpora No | 4110172 |
| Position | Front axle, left and right |
| Nominal Size | 19.5 x 54.5 x 73.5 mm (inner dia. x outer dia. x height) |
| Material | Polyurethane (PU) |
| Fitment | Ford (Focus, C-Max family) |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
On a MacPherson strut front end, the bump stop is the last line of defence for the damper and the upper mount. Through normal driving it sits idle, riding up and down the damper rod as the suspension moves. When the suspension compresses far enough that the piston runs out of usable travel, the stop becomes the load path: it takes the energy that would otherwise hammer the damper body, the top mount bearing and the subframe bushes.
That is why a stop that has lost its height or its elasticity turns into a noise complaint. The metal parts start touching sooner, and the driver hears it before the workshop sees it on a ramp.
Rubber and EPDM stops age from heat, road salt and constant flexing. The usual failure order is surface cracking, then crumbling foam, then displacement up or down the rod as the material loses its grip on the collar. Lost height changes where the bump travel begins, which owners report as a hard knock over speed bumps, a crash noise on broken tarmac, or a harsh feeling at the end of a fast compression.
Once the stop has crumbled, the debris often works its way into the dust boot and the damper seal, so replacing the stop early is cheaper than replacing the strut later.
Our stops are moulded in cast polyurethane rather than rubber. PU resists tearing and compression set far better, keeps its memory after thousands of full-travel hits, and does not absorb oil and hydraulic fluid the way rubber does. Cast PU also holds a moulded detail cleanly, so the bore, the collar step and the contact face stay consistent from the first shot to the last.
For taxis, delivery vans and any Focus doing stop-start city work, that translates into a longer service interval and fewer warranty claims on the front end of the car.
OE 1531648 is tied to the Ford C1 front strut family rather than to a single model year. Confirm three things from the car or the workshop sheet before you buy:
| Check | What to Confirm |
|---|---|
| Axle position | Front axle. Rear stops on the same platform are a different number and length. |
| Suspension type | Standard, sport or ST-tuned struts can carry different stop heights. |
| Damper rod diameter | Rod must pass through the inner bore. This stop is built on a 19.5 mm bore. |
| Quantity per car | Two per vehicle, one left and one right. Always replace as a pair. |
Because Ford applied several stop variants across Focus and C-Max build years, we recommend sending a VIN or a photo of the old part together with the number. Our team cross-checks the rod diameter, the stop height and the dust boot collar before confirming supply. If you are also refreshing the mounting hardware, the shock absorber parts section covers the related components.
Parts catalogues list this stop under both the Ford number and a family of aftermarket references. The table below gives the numbers we see most often in buyer enquiries.
| Reference Type | Number |
|---|---|
| Ford OE | 1531648 |
| Bonpora | 4110172 |
| Application | Ford Focus / C-Max, front strut |
Interchange tables are a starting point, not a guarantee. Some catalogues group front and rear stops under the same heading because both are sold as suspension buffers. Always match the drawing dimensions rather than the description alone. For a wider view of the product family, see our polyurethane bump stops range.
This is the fastest route for a maintenance or trade buyer. Give us the number 1531648 together with the size 19.5 x 54.5 x 73.5 mm and we quote against stock or a short production run. We hold the mould for this geometry, so there is no tooling charge on a repeat order and no waiting for a new mould to be cut.
Mixed cartons combining several bump stop numbers are normal for us, which keeps freight per piece low on consolidated orders. If you are buying for a workshop group, send the full list of numbers in one enquiry and we will quote them as a single shipment.
If the number has worn off the old part, describe the vehicle instead: model, year, engine, axle and suspension variant. A photo of the strut with the stop in place is usually enough for us to identify the correct geometry, and we will confirm back with the number we intend to ship before anything is packed.
This route is common with independent workshops that do not keep a parts catalogue at the counter. It also protects against the most expensive mistake in this part family: ordering a rear stop when the car needs a front one.
Distributors and private label brands often need the same function in a different compound, colour or hardness. We mould to your drawing and can adjust PU hardness, add a brand marking on the moulded surface, and pack to your own carton artwork. Typical custom briefs include a firmer stop for a sport-tuned strut, a softer progressive stop for comfort tuning, and an oil-resistant compound for markets with heavy traffic and high under-bonnet temperatures.
Custom programmes normally start with a sample for approval, then move to a production order once the hardness and dimensions are signed off. Full details are on the custom parts page.
Every production lot is checked against the drawing for bore diameter, overall height and hardness before packing. We can supply dimensional reports and material certificates with the shipment, which is what most importers need to clear their own incoming inspection without re-testing every carton. Samples are available for first-article approval before a production order is released.
Because the part is a safety-adjacent suspension component, we do not accept visual inspection alone. Hardness and compression behaviour are the two properties that decide whether a stop survives its service life, so both are recorded per batch and kept on file against the shipment reference.
For buyers running an approved supplier process, we can also complete your own inspection form and return it with the shipping documents, so your QA file stays complete without a separate audit visit.
Not every application needs PU. The table below summarises where each compound makes sense, based on the enquiries we handle most often.
| Consideration | Cast Polyurethane | Rubber / EPDM |
|---|---|---|
| Compression set | Low, recovers well after full travel | Higher, height loss over time |
| Tear resistance | High, resists splitting at the collar | Moderate, cracks at flex points |
| Oil and fluid contact | Good resistance | Swelling and softening |
| Noise level | Slightly firmer end stop | Softer, quieter at low speed |
| Best fit | Fleet, taxi, commercial use | Comfort-first passenger use |
Both compounds are available from the same mould for many of our bump stop geometries, so a distributor can carry one shape in two specifications and cover a wider buyer base without doubling tooling cost.
Standard export packing is neutral carton with a printed label carrying the OE number and size, so the carton can go straight into your warehouse without repacking. We can also pack to your own label and barcode if you supply the artwork.
Lead time is typically 15 to 30 days depending on quantity, mould availability and whether the order is a repeat. Small trial orders ship by air or express; repeat volume moves by sea or rail. For urgent breakdown stock we can check whether the required size is on the shelf and quote an air shipment separately.
It is a front axle strut bump stop. Rear suspension buffers on the same Ford platform use different numbers and different heights, so please do not substitute one for the other even though both are described as bump stops in some catalogues.
Two, one per front strut. Replace them as a pair even if only one looks damaged, because both have seen the same mileage and the same road conditions.
Yes. We mould cast polyurethane to a range of hardness values and can produce coloured compounds or add a moulded brand marking. Send your target hardness or your old sample and we will match it.
The OE number or a vehicle description, the quantity, and the destination port or city. If you have a drawing or the old part, include the measured bore, outer diameter and height. We answer with unit price, MOQ, lead time and packing details in one reply.
Our factory supplies front and rear suspension buffers for European, Japanese, Korean and American applications, in polyurethane and rubber, from small trial lots to container volume. Send the number 1531648, or your own drawing, and we will confirm price, lead time and packing the same working day.
Contact our export team today with your part number, quantity and destination port.
