VW SEAT Strut Bump Stop 5Q0511357M | OEM Replacement Supplier & Custom Manufacturer

VW SEAT Strut Bump Stop 5Q0511357M - Rear Axle Stop Buffer Overview

The 5Q0511357M is the rear axle strut bump stop fitted to Volkswagen and SEAT models on the MQB platform, most notably the Golf VII family and the Leon 5F family. Mounted on the damper rod of each rear shock absorber, this polyurethane buffer is the final stage of travel control: once the coil spring and the damper approach full compression, the bumper engages and converts the remaining impact into a progressive, controlled load instead of a hard metal-on-metal stop. Bonpora supplies this reference under part number 4110118 as an OEM replacement and also supports custom polyurethane designs for distributors and suspension programme owners.

For trade buyers the part sits inside a family of nearly identical VAG stop buffers that differ mainly in working height. Ordering by shape alone is the fastest route to an incorrect purchase order. This page therefore concentrates on what the 5Q0511357M actually is, which vehicles it matches, and how the letter suffixes in the 5Q0511357 series map to different heights.

Key Specifications of the 5Q0511357M

All figures are nominal. The Bonpora drawing gives a 14.2 mm bore, a 60.4 mm outer diameter and a 113.2 mm height, while European catalogue data for the same OE lists a 112 - 113 mm working height and about 0.14 kg per piece. Small deviations come from measurement points and compression set of a foam part, so compare against the removed bumper before confirming a bulk order.

Function Inside the Rear Axle Assembly

Progressive Compression and Damper Protection

On the MQB rear multi-link axle the buffer slides over the piston rod, seated between the dust sleeve and the upper mount area of the strut. Near full compression the polyurethane wall collapses at a rising rate and absorbs the last portion of energy that the damper cannot dissipate in time. A worn or missing buffer lets the damper bottom out internally, which typically shows up as harsh clunks over sharp edges and, with continued use, as oil weeping from the rod seal.

Replaced Together With the Dust Sleeve

In the factory exploded view the stop buffer is listed next to the bellows, reference 5Q0513425J for many Golf VII rear dampers. The sleeve keeps grit and water away from the rod while the buffer handles the final travel. Because polyurethane foam takes a permanent set after years of loaded service, workshops usually replace both parts at the same time. Bonpora can quote matched sets for programme customers on request.

Vehicle Compatibility and PR Code Matching

Catalogue data attaches the 5Q0511357M to the rear axle of the following Volkswagen and SEAT families. The listed engine range runs from 86 to 360 hp, from 1.0 TSI economy versions up to 2.0 GTI TCR and Cupra versions. This spread is a reminder that bumper selection follows the suspension specification rather than the engine badge, so the table is a shortlist and not a substitute for a VIN check.

Year ranges follow catalogue conventions and overlap at model changeovers, so treat them as orientation only.

Rear Suspension Codes 1JR and 1JS

VAG parts lists attach the 5Q0511357M to rear suspension PR codes 1JR (rear shock absorption) and 1JS (rear sports shock absorption), with UA1 and UA2 notation in some market catalogues. In practice the same model line can carry different rear buffers depending on suspension and equipment. Check the PR code on the vehicle data sticker, or read the OE number from the removed part, before releasing a purchase order.

The 5Q0511357 Family - Height Is the Selector

Within the 5Q0511357 series the trailing letter marks the working height and the damper pairing. Published catalogue data shows 5Q0511357AA and 5Q0511357F at about 133 mm, 5Q0511357H at about 127 mm and the 5Q0511357M at about 112 - 113 mm, with G and J as further catalogue variants. Because the spring seat position on the strut is fixed, a taller or shorter buffer moves the point at which progressive travel begins, so the suffixes are not freely interchangeable within one axle.

Generation Boundary: 1K0511353J Versus 5Q0511357M

Buyers who stock for both Golf generations often ask whether the PQ35 rear buffer 1K0511353J and the MQB rear buffer 5Q0511357M can substitute each other. They cannot. The PQ35 part works at roughly 101 mm with a different seat geometry, while the MQB part works at roughly 113 mm with a 14.2 mm bore. See our dedicated page on the PQ35 rear stop buffer 1K0511353J for the earlier platform, and keep the two references in separate stock locations.

Aftermarket Cross References for 5Q0511357M

Independent aftermarket brands already list direct equivalents for this reference, which helps when a customer quotes a brand number instead of the OE. Published cross references include the following; verify details against the data sheet of each brand.

Polyurethane Versus Conventional Rubber Bump Stops

Bonpora manufactures the 4110118 buffer in polyurethane, the same material family the OE uses here. For buyers comparing materials across a suspension programme, the practical differences are summarised below.

These are engineering tendencies rather than promises for every application. Because the OE reference itself is a polyurethane component, replacement parts in the same material keep the intended suspension characteristic.

Sourcing From Bonpora - Supplier and Custom Options

OEM Replacement Supply for Distributors

Bonpora produces polyurethane suspension buffers as a factory line, with the 5Q0511357M listed under reference 4110118. Supply terms follow the parameters on this page: neutral export packaging, a 1 year warranty on the part and a delivery window of 15 to 30 days depending on quantity and scheduling. Order lines can be mixed across the bump stop range in one shipment, reducing freight cost per piece for catalog distributors.

Custom Design and OEM Support

Beyond catalogue supply the factory offers OEM and custom design support. Typical requests include modified working heights for lowered or raised suspension programmes, tuned compression rates, coloured compounds and customer branded packaging. Development usually starts from a sample or a dimensioned drawing, followed by a first article for approval before series production. Buyers who need other suspension components can browse the wider auto parts range or the dedicated polyurethane bump stop catalogue, and the custom parts service describes the drawing based development route.

Frequently Asked Questions

How do I confirm that 5Q0511357M fits my Golf VII or Leon 5F?

Use three checks together. First, match OE number 5Q0511357M against the number on the removed buffer or listed for your VIN. Second, confirm rear suspension PR code 1JR or 1JS on the vehicle data sticker. Third, compare the dimensions: a bore near 14.2 mm, an outer diameter near 60.4 mm and a height near 113 mm. If any check fails, the vehicle probably carries a different suffix within the 5Q0511357 family.

What is the difference between 5Q0511357M and 5Q0511357AA or 5Q0511357H?

Mainly the working height: roughly 113 mm for the M, about 127 mm for the H and about 133 mm for the AA and F variants. The parts look similar in photographs, but the height decides where progressive travel starts, so they are not interchangeable. Identify by the suffix on the OE part, not by appearance.

Can polyurethane bump stops replace the rubber original?

For 5Q0511357M the original part is already a polyurethane component, so a PU replacement keeps the intended characteristic. Where the OE was rubber, a PU part changes the compression feel slightly, and many tuning suppliers use that deliberately. Bonpora can adjust rate and height for programme builds, provided the working envelope of the damper is respected.

What are the delivery time and packaging terms for wholesale orders?

Standard delivery time is 15 to 30 days depending on order size and production scheduling, with neutral export packaging as the default. Branded packaging is available under the custom service, and the parts carry a 1 year warranty. Quotations for mixed container loads across the bump stop range are available on request.

Request a Quotation for 5Q0511357M

Send the OE number 5Q0511357M or the Bonpora reference 4110118 together with your quantity, destination port and any packaging requirement, and the sales team will reply with a quotation and current lead time. For custom heights or private label supply, attach a drawing or a sample description so engineering can confirm feasibility.