Audi VW Strut Bump Stop 5N0511359A | OEM Replacement Supplier & Custom Manufacturer

Audi VW Strut Bump Stop 5N0511359A - Rear Axle Buffer Overview

The 5N0511359A is the rear axle strut bump stop for the first generation Volkswagen Tiguan, the Touran 1T3 and the Audi Q3, and it is one of the most frequently requested 143 mm stop buffers in the VAG suspension trade. Mounted on the piston rod of each rear shock absorber, inside the protection pipe and in the centre of the coil spring, the buffer takes over at the end of the compression stroke: once the spring and the damper approach full travel, it compresses progressively and converts the remaining impact into a controlled, cushioned load instead of a hard metal stop. Bonpora manufactures this reference under part number 4110105 in polyurethane and supplies it to distributors, suspension kit assemblers and workshop chains as a direct OEM replacement.

For trade buyers the commercial case is clear. The Tiguan 5N was built from 2007 to 2017 and shares its platform architecture with the Audi Q3 8U, so the installed base across Tiguan, Touran and Q3 remains large in every export market, and the buffer is a standard wear item renewed together with rear dampers and dust protection. This page summarises the specifications, the verified fitment, the family structure and the custom manufacturing options.

What the 5N0511359A Stop Buffer Does in the Rear Suspension

Volkswagen catalogues the component under names including Stop buffer and Rubber Buffer, suspension, and the parts catalogue entry reads BUFFER 143 with a quantity of two per vehicle. All of these names describe the same elastomer body: the final stage of rear suspension travel control on a multi-link coil spring axle. A polyurethane buffer of this type is formulated to be dense and progressive, so it absorbs the last part of the stroke when the coil spring alone would bottom out against the damper. Without a serviceable buffer, full-compression events pass directly into the damper rod and the top mount and accelerate wear of more expensive components.

Three practical points matter for buyers. First, the 5N0511359A is catalogued for the rear axle only, fitted left and right, two pieces per vehicle, and it is a symmetrical slip-on part, so there is no separate left or right article number to manage in stock. Second, the buffer operates together with the protection pipe 3C0513425, the mounting bolts N91066201 and the self-locking nut N10304102, and most workshops inspect or replace the buffer and the pipe as a pair, because a cracked pipe lets grit reach the buffer and the damper rod at the same time. Third, the Tiguan 5N was never offered with air suspension, so coil spring and buffer service parts cover the entire model range without exceptions.

Technical Specifications of the 5N0511359A Buffer

A short note on dimensions helps to avoid disputes at goods-in inspection. The VW catalogue assigns a working height of 143 mm, the febi listing records a thickness of 143.0 mm, and the Bonpora drawing measures 15 mm bore, 63.1 mm outer diameter and 134 mm height. These values describe the same buffer at different measurement points and tolerances, so the catalogue height remains the decisive check.

Vehicle Applications - Tiguan 5N, Touran 1T3 and Audi Q3 8U

European catalogue data links the reference to the rear axle of three VAG model lines. The table below condenses the applications buyers verify most often.

The engine range behind these applications is broad. On the Tiguan 5N the catalogue covers 1.4 TSI petrol from 110 to 150 hp, 2.0 TSI and TFSI petrol up to 211 hp and 2.0 TDI diesel from 110 to 184 hp, in front wheel drive and 4motion versions. On the Touran 1T3 it covers 1.2 and 1.4 TSI petrol, the 1.4 TSI EcoFuel gas version and 1.6 and 2.0 TDI diesel from 77 to 177 hp, and on the Audi Q3 8U the 1.4 TFSI, the 2.0 TFSI up to 211 hp and the 2.0 TDI range from 120 to 184 hp.

Because the 1JP and 1JT equipment codes describe the rear suspension build rather than a model year, model and year alone do not guarantee a match. The codes are printed on the factory data sticker in the service booklet or the boot well, and buyers should confirm them against the VIN before releasing an order.

The 5N0511359 Family - Equipment Codes Separate the Variants

The 511 359 numbering block covers the rear axle buffers of the Tiguan 5N family. Unlike many VAG buffer families, the variants here share the same 143 mm height and are separated by the rear suspension equipment code instead. This is the most common source of ordering errors, and the table below shows where the 5N0511359A sits.

Two conclusions follow for purchasing teams. A buffer ordered by height and outer diameter alone can fit the damper body and still be the wrong variant, because the assignment is controlled by the equipment code, so enquiries that quote only model and year should be answered with a request for the data sticker code or the VIN.

One platform boundary also deserves attention. The second generation Tiguan on the MQB platform, built from 2016 onwards, uses a different rear axle with different buffer numbers, and no mechanical component crosses between the two generations, so stock should always be kept against the 5N0511359A reference itself.

Aftermarket Cross-Reference Numbers for 5N0511359A

Independent aftermarket brands list the same buffer under their own article numbers. The following references are recorded against OE 5N0511359A in established catalogue systems.

Stocking against the OE number rather than against one aftermarket brand keeps the line interchangeable across all of these references, and it simplifies customer support when an enquiry quotes a febi or SWAG number instead of the VW original. Our auto parts catalogue lists the full strut bump stop programme organised by OE reference.

Signs of Wear and Replacement Guidance for the Rear Buffer

Rear buffers on Tiguan, Touran and Q3 applications are wear items. Frequent loading, towing, bad road surfaces and high mileage compress the buffer thousands of times per year, and polyurethane also ages with ozone exposure and temperature cycling. Workshops usually find the part due for replacement somewhere between 80,000 and 150,000 km, and always whenever rear dampers are renewed. Typical symptoms of a degraded 5N0511359A include:

• A hard knocking or clunking from the rear axle over speed bumps, driveway edges or potholes.
• The rear end bottoming out when the car is fully loaded, when towing a trailer or when driven over uneven ground.
• Visible crumbling, powder residue or permanent compression set once the protection pipe is pulled back.
• A noticeably harsher rear ride, because the buffer no longer supplies its progressive cushioning stage.

Buffers are replaced in pairs per axle to keep the suspension response symmetric, and the protection pipes should be inspected at the same time. Refitting new dampers behind a cracked buffer shortens the life of the new strut, so the buffer and damper are best renewed as a service set.

Polyurethane versus Rubber in Stop Buffer Production

Bonpora produces this reference in polyurethane, the material class specified for progressive stop buffers across the VAG supplier base. The table below summarises why polyurethane has become the standard for this component family.

For buyers the practical meaning is simple: a polyurethane buffer keeps its height and damping curve for longer in service, reducing warranty claims on the surrounding strut assembly. More material background is available on our polyurethane bump stops page.

OEM Supply and Custom Strut Bump Stop Manufacturing at Bonpora

Beyond the standard catalogue programme, Bonpora operates as a custom suspension buffer manufacturer for brands that need their own specifications. Working from a drawing, a table or a physical sample, our engineers produce strut bump stops with custom core and outer diameters, heights from roughly 40 mm to 200 mm, and polyurethane densities tuned to the required compression curve. Tooling is developed in-house, which keeps sample lead times short and unit costs competitive at volume.

Typical custom projects include buffers for vehicles outside the Tiguan and Q3 range, heavy-duty versions for taxi and fleet programmes, and private-label production for suspension kit assemblers. Custom options extend to material hardness, colour, laser-marked part numbers and branded packaging, and our custom parts team supports the development from sample to serial production.

Ordering Information for Bonpora Nos 4110105

Bonpora Nos 4110105 (OE 5N0511359A) is produced with a standard lead time of 15 to 30 days and ships in neutral export packaging suitable for repacking under your own brand. The part carries a 1-year warranty, and MOQ is flexible for distributors testing the market or consolidating mixed-container orders. Contact our export team with the OE number and your destination market for a quotation, and we will respond with technical data and pricing within one working day.

FAQ

How do I confirm that the 5N0511359A fits my Tiguan, Touran or Q3?

Check the rear suspension equipment code rather than the model year. This buffer serves builds with the 1JP code on the Tiguan 5N and Touran 1T3 and the 1JT code on the Audi Q3 8U. Measuring the removed part is equally reliable: a catalogue height of 143 mm identifies this reference family. You can also send your VIN to our sales team for verification before ordering.

Is the 5N0511359A a front or rear bump stop?

It is a rear axle buffer, fitted left and right, two pieces per vehicle. The front buffers of the Tiguan 5N and Q3 8U carry separate references, so a front or rear mix-up is visible immediately from the fitting position and the height of the old part.

What is the difference between 5N0511359A and 5N0511359C?

Both are rear buffers with the same 143 mm catalogue height, but they belong to different rear suspension builds. The A variant serves the 1JP and 1JT equipment codes, while the C variant serves the 1JN code on Tiguan 5N builds from 2012 to 2018. Because the height is identical, the equipment code or the VIN, not the measurement, decides which variant to order.

Can Bonpora produce this buffer in a custom size or under my own brand?

Yes. We manufacture strut bump stops to customer drawings or samples, with heights from roughly 40 mm to 200 mm, adjustable polyurethane hardness, laser marking and private-label packaging. Send the drawing or the OE reference and your target quantity, and our engineering team will confirm feasibility and sample lead time.