Volkswagen Strut Bump Stop 1H0512131C | OEM Replacement Supplier & Custom Manufacturer

Volkswagen Strut Bump Stop 1H0512131C at a Glance

The Volkswagen strut bump stop 1H0512131C is the 140 mm rear jounce bumper fitted to Golf Mk3, Vento and Corrado models built on the firmer GTI 16V and VR6 suspension. It sits inside the rear coil spring on the shock absorber rod and works as the final compression stop of the rear axle, so the spring never reaches solid height and the damper body is never driven into its own internal stop.

This is the tall variant of the 1H0 512 131 family. Where the standard rear stop measures roughly 80 mm, the original equipment (OE) C version is 140 mm long, which matches the shorter free length and higher rate of the sports springs used on the 2.0 16V and 2.8 / 2.9 VR6 cars. Buyers searching by OE number should therefore confirm the height before ordering, because the two versions are not interchangeable even though the part number prefix looks similar.

Bonpora supplies this stop under reference 4110015 in molded polyurethane, produced for wholesale, distributor and private label programs. The construction resists the oil, ozone and road salt exposure that degrades natural rubber on older platforms, and it keeps its density over long service intervals.

Technical Specification

The 10.2 mm bore accepts the original rear damper rod without an adapter sleeve. The 69 mm outside diameter is measured across the widest molded collar, and the 140 mm length is the free height of the stop before installation. Some catalogues describe the same component as 67 x 67 mm with a 140 mm length, which is simply a different measuring point on the same molding; we recommend comparing the drawing against the part removed from the vehicle rather than relying on a single dimension.

Vehicle Fitment for OE 1H0512131C

This rear stop belongs to the vehicles that left the factory on the firmed-up rear suspension. The table below lists the main applications confirmed against European parts catalogues and the manufacturer classic parts programme.

Engine codes recorded against this stop

Catalogues list the following engine codes for the 140 mm version: AAA (2.8 VR6, 174 PS), ABV (2.9 VR6, 190 PS), ABF (2.0 16V, 150 PS), ADY, AGG and AKR (2.0, 115 PS), plus ADZ and 2E units on later Vento and Golf builds. The common factor is not the engine alone but the rear suspension specification that those engines were paired with.

Why the standard rear stop does not fit these cars

The 140 mm version used here is the firmer, longer stop. Earlier or weaker engines on the same platform use a shorter rear buffer with a different suffix letter. Fitting a short stop on a GTI or VR6 rear axle leaves too much free travel before the stop is engaged, so the spring can compress further than intended and the damper reaches its internal limit. Always read the part number cast or printed on the old component before ordering, and check the vehicle identification number and the suspension specification where the catalogue offers that filter.

What This Rear Bump Stop Does

A rear bump stop has three jobs, and on a car with a sports-tuned rear axle all three matter more than on a standard family model.

1. Progressive end-of-travel cushioning

As the rear spring compresses over a pothole, a load in the boot or a speed hump, the coil closes onto the stop. Because polyurethane deflects progressively, the last part of the travel becomes rapidly stiffer instead of ending with a metal-to-metal impact. The result is a controlled, quieter compression rather than a hard knock through the body shell.

2. Shock absorber protection

The rod seal and the internal rebound valving are the parts that suffer when a damper is driven into its own end stop. By absorbing the final travel, the bump stop limits the peak load carried by the shock absorber and extends its working life.

3. Spring and body protection

Without a stop, coil bind becomes possible on a hard compression, and the load path moves into the spring seats and top mount. A correctly sized buffer keeps the spring within its designed travel window.

Symptoms of a worn rear stop

• Heavy knocking or a dull thud from the rear axle over short, sharp bumps.
• A sudden, hard jolt at the end of rear suspension travel instead of a progressive feel.
• Visible cracking, crumbling, splitting or oil softening of the old stop when inspected with the spring out.
• The stop loose on the damper rod, or a missing rubber section.
• Rear ride height that drops further than normal under load.

Because the stop is hidden inside the rear coil spring, inspection normally means removing the rear damper or spring. On cars of this generation the labour is modest, and replacing both sides at the same time keeps the rear axle balanced.

Material: Polyurethane Compared with Rubber

The original part was molded in rubber. This replacement is produced in polyurethane, which holds up better in the conditions these cars now see as classics or as daily drivers in harsh climates.

The practical benefit is that a polyurethane stop keeps its dimensions over years of service, so the point at which it starts to control the axle travel stays consistent instead of drifting as the rubber ages. For a workshop or a distributor supplying this platform, that consistency reduces warranty claims.

Cross Reference Numbers

Buyers often search by the number printed on the box rather than the OE code. The list below shows common aftermarket references that correspond to 1H0512131C, confirmed against supplier catalogues.

Cross reference lists are a starting point, not a guarantee. Manufacturers change suppliers across production years, so we advise confirming the OE number taken from the vehicle before ordering, especially where the same model was built in different plants.

Replacement and Supersession History

The 1H0512131C stop was superseded in some markets. Volkswagen records show the C number replaced by 1GD512131A from April 2011 for vehicles in China, and the same 1GD family appears in aftermarket listings as an interchangeable alternative. For older European and North American cars the C number remained the service reference, and both numbers describe the same 140 mm rear stop for the sport suspension. Where a supplier offers only 1GD512131A or 191513425, those references can be treated as valid alternatives for this application.

Because the family uses several suffix letters with different heights, the safest procurement path for a distributor is to stock the 140 mm version against the C and 1GD numbers and keep the short variant on a separate line item.

Ordering Options for Wholesale Buyers

Bonpora manufactures and exports suspension elastomer parts for importers, distributors, workshop chains and private label programmes. Several purchasing routes are available for this rear stop.

OE replacement supply

Parts molded to the original 10.2 x 69 x 140 mm envelope, supplied in neutral export packaging or in your own branded cartons. Standard orders ship in 15 to 30 days depending on quantity and carton artwork.

Custom and private label manufacturing

If you need a specific durometer, a different height, a coloured compound or a branded poly bag, tooling can be developed from a drawing or from a sample supplied by the buyer. This is a practical route for distributors who want to differentiate their own line of suspension service parts for the older Volkswagen platforms.

Mixed container programmes

This stop is commonly ordered together with other suspension rubber and elastomer service items in a mixed container. Consolidating the order reduces freight cost per piece and simplifies customs paperwork.

Our engineering team can review the reference you are currently supplying and propose an equivalent specification with a drawing for approval before production. For buyers who work from a sample, send the worn part together with the vehicle details and we will confirm the height, bore and material before quoting.

For related suspension elastomer items, see our polyurethane bump stops range, browse the wider auto parts catalogue, or discuss a tailored programme through custom parts.

Installation Notes

1. Lift and support the vehicle safely, then remove the rear wheel on the side being worked on.
2. Support the rear axle, release the lower damper mounting and lower the axle enough to remove the coil spring and reach the stop.
3. Pull the old stop off the damper rod. If it has bonded to the piston rod, cut it away carefully without scoring the rod surface.
4. Clean the rod and the spring seat. Check the damper for oil weeping and the top mount for cracking; replace worn parts now rather than repeating the labour later.
5. Fit the new stop onto the rod and reseat it in the spring. It should sit square and hold its position without adhesive.
6. Refit the spring, reconnect the damper with new mounting hardware where specified, and torque to the figures in the workshop manual.
7. Repeat on the other side, refit the wheels and have the rear alignment checked after reassembly.

Allow the suspension to settle before the final torque check, and carry out a short road test at low speed over uneven ground to confirm that the axle compresses smoothly with no knocking.

Buyer Checklist Before Ordering

• Confirm the OE number on the vehicle is 1H0512131C, 1H0 512 131 C or 1GD512131A.
• Confirm the rear stop height is 140 mm; a short stop from the same family will not suit a sport-tuned rear axle.
• Confirm the bore suits the damper rod currently fitted, and whether the rear dampers are original specification.
• Order two pieces per vehicle so that both sides are renewed together.
• State any private label, packaging or durometer requirement when requesting the quotation.

Frequently Asked Questions

Is 1H0512131C a rear or a front part?

It is a rear axle part. It fits on the rear shock absorber rod inside the rear coil spring, two pieces per vehicle. Front stops on these platforms use different part numbers.

Will this stop fit a standard Golf Mk3 as well as the GTI and VR6?

The 140 mm C version is specified for the firmer rear suspension used on GTI, GTI 16V, VR6 and comparable sport builds. Cars with standard rear suspension generally use a shorter buffer from the same family, so the height should be confirmed from the old part or the vehicle specification before ordering.

Can I replace the stop without replacing the shock absorbers?

Yes. A bump stop is a separate service item and can be renewed on its own. If the dampers are leaking or the rubber top mounts are cracked, replacing them during the same job avoids repeating the disassembly.

Do you supply this part with custom packaging or a private label?

Yes. Neutral export packaging is standard, and branded cartons, poly bags and labels can be produced to buyer artwork. Custom heights, durometers and colour compounds are also available where a drawing or sample is provided.

Request a Quote for the VW Rear Strut Bump Stop

Send us the OE number 1H0512131C, or Bonpora reference 4110015, together with the quantity you require and any packaging or material specification. Our team will confirm the correct 140 mm specification, provide a quotation and a delivery schedule, and support the project through sampling and mass production. Buyers working on other Volkswagen or SEAT platforms are welcome to send their full suspension parts list for a consolidated offer.