Strut Bump Stop OE 1K0511353M for VW, Audi and Skoda | Factory-Direct Supplier

A rear jounce bumper is one of the cheapest items on a suspension rebuild list and one of the most frequently replaced. When a buyer searches for OE 1K0511353M, the number comes from a Volkswagen Group catalogue, the application is known, and what matters is that the stop seats correctly on the rear spring, recovers after compression, and matches the duty of the original. This page covers the specification we supply against this reference, the models it fits, the trade numbers it cross-references to, and what buying direct from a Chinese factory changes.

What OE 1K0511353M Is

The number belongs to the rear axle of the Volkswagen Group PQ35 platform, the architecture shared by the Golf V and Golf VI generations. Catalogues describe the part as a bumper, jounce bumper, coil spring damper or suspension buffer; all of these name the same object, an elastomer body at the spring position that cushions the coil as it compresses.

Position and function

Here the stop works with the rear coil spring rather than inside a front strut, and it is progressive: largely passive through normal travel, then taking up load rapidly in the last part of the stroke. That limits coil-to-coil contact, prevents metal-to-metal bottoming inside the damper, and reduces the peak load reaching the strut mount and the body structure.

The 1K0 prefix

Volkswagen Group numbers are structured rather than arbitrary. The leading block 1K0 identifies the platform family, the next block the component group, and the trailing letter a revision code. Because several Group brands were built on the same platform, one reference serves Volkswagen, Audi and Skoda catalogues at once, which is why a single stop covers such a long model list.

Reference Specification for the 1K0511353M Bump Stop

The table below lists the specification set we supply against this reference. When comparing quotations, treat the application list and the elastomer as the two lines that decide whether two offers are the same part.

Reading the specification set

Bonpora number 4110101 is our internal item code, useful when requesting a sample or quoting the part later. A lower price achieved by thinning the wall, changing the hardness grade or shortening the body is not a like-for-like alternative: each change alters how the stop behaves in the final part of the stroke.

Catalogue data for this application is generally listed at a nominal 133 mm height, while our drawing holds 134 mm. That sits inside the normal tolerance band for a moulded elastomer; if your catalogue entry is built from a specific revision, send it and we will confirm the figures against it.

Which Vehicles Use This Reference Number

Fitment is the first thing an overseas buyer checks, because a stop listed against the wrong model year produces returns rather than repeat orders. The reference is fitted on the rear axle of the models below.

Why platform coverage matters

A distributor serving Volkswagen and Audi owners in one market can often cover a whole model range with one line item instead of three, which cuts slow-moving stock and simplifies container consolidation. That argument is worth putting in front of a purchasing committee.

Checks before you order

Three variables decide which stop is correct: axle position, all-wheel drive, and whether the car carries ride control or a sports suspension. Front and rear stops are not interchangeable. Where a catalogue lists several heights for one model, quote the model year, the VIN where available, and the axle position being repaired.

Cross-Reference and Trade Numbers

The numbers below appear against this application in European aftermarket catalogues. Supersession and variant chains are common on this platform, so treat the list as a starting point for verification rather than proof of identity.

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 part, and we will confirm whether it matches before you order.

Why Polyurethane Suits a Rear Jounce Bumper

Polyurethane suits this class of part because the formulation can be tuned. Changing the mix shifts hardness, rebound and compression set, so one body shape can be produced for a comfort-oriented car or a heavier load case. Compared with conventional rubber it resists tearing better, is less affected by oils and road salt, and holds its shape longer under repeated compression.

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.

Buying Direct from a Chinese Factory

The enquiry behind this part often comes from an importer evaluating a supply channel rather than shopping for one number, which changes what a useful reply looks like.

What factory-direct changes

An intermediary adds a margin layer between the buyer and the mould. Working direct means tolerances, hardness, packing and inspection criteria are discussed with the party that runs the press, so an agreed change reaches production without being lost on the way. For a low unit-cost, high-turnover part that is usually worth more than a small difference in quoted price.

Production route and documents

Stops of this profile are produced by casting or moulding, depending on geometry and hardness; the route is agreed at the sample stage because it sets tooling cost and the achievable tolerance band. Buyers evaluating a supplier normally ask for the following, which we prepare to order rather than bundle automatically:

• Material grade and batch traceability for the elastomer.
• A dimensional inspection report against the agreed drawing.
• A sample approval record before series production starts.
• Packing specification, including carton marking and barcode requirements.

Listing these at enquiry stage avoids a delay at shipment. Stops are also commonly bought with other chassis parts, and mixing them into one container reduces freight cost per unit.

How Buyers Search for This Part

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.

Search by OE number

This is the most common and most precise route. A buyer searching for 1K0511353M knows the application and wants a direct replacement, so confirm the reference, the fitment list, the material grade, and whether the item is ex-stock or produced to order.

Search by part type plus specification

Buyers without a number search by description, for example polyurethane rear jounce bumper, 134 mm coil spring damper, or suspension buffer with a defined bore. These enquiries are broader, so set out platform coverage and ask for vehicle details or a sample.

Search by vehicle model

Searches that start from the vehicle, such as rear suspension bump stop for Golf VI or jounce bumper for Audi A3, usually come from repair shops and smaller distributors. A clear fitment list and a cross-reference table keep them short. Related items sit in our chassis and suspension range.

Search by supplier and factory

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. For a long-term channel rather than a single order, our shock absorber parts programme covers stops with related suspension components.

Custom and private-label requirements

Buyers who already hold a mould, drawing or 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.

Fitting Notes and Inspection Points

Because the stop compresses before the damper reaches the end of its travel, it protects more expensive parts at the same time, limiting the peak load reaching the mount and body and keeping the spring inside its working range. Signs it has reached the end of its life:

• The elastomer body is visibly crushed, split or missing material.
• The stop has hardened and no longer returns to shape when pressed.
• Clunking or knocking noises over uneven surfaces.
• Witness marking on the spring coils, or oil misting around the damper.

Because the part is inexpensive it is often left in place during a spring or damper change, leaving a new damper beside a crushed original stop and a repair that comes back. Replacing both at the same time is usually cheaper for the end user.

Packing, Delivery and Order Terms

• Packaging: neutral export packaging; branded cartons on request.
• Delivery time: 15-30 days, ex-stock or produced to order.
• Mixed orders: can be combined with other chassis parts in one shipment.
• Sample orders: a sample can be arranged so you can check fit and elastomer quality first.
• Warranty: 1 year, covering manufacturing defects under normal service.

Frequently Asked Questions

Which vehicles does OE 1K0511353M fit?

It is listed for the rear axle of Volkswagen Group PQ35 models: Golf V and Golf VI, Golf Plus, Golf VI Variant, Jetta and Jetta Wagon, Eos, Rabbit, R32, GTI and Touran, plus Audi A3 and A3 Convertible and Skoda Octavia Mk2. Where a catalogue distinguishes all-wheel drive, ride control and sports suspension variants, send the vehicle details and we will confirm the correct height.

Is 1K0511353M the same as 1K0511353P?

Both are rear axle buffers listed against overlapping Volkswagen Group applications and appear together in aftermarket cross-reference data. They are separate part numbers, so we do not treat them as automatically interchangeable. Send the number you hold and we will confirm which applies.

What size is the bump stop?

Our drawing holds a 15 mm bore, a 63.1 mm body diameter and 134 mm overall length in polyurethane; catalogue data for this application is commonly listed at a nominal 133 mm height. Size is confirmed against the drawing revision at quotation.

Can the stop be supplied to our own drawing or private label?

Yes. Send a drawing with the key dimensions, or a physical sample for reverse engineering, 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.

Request a Quotation for the 1K0511353M Strut Bump Stop

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 4110101 to route your enquiry to the correct production file.