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Strut bump stop 51722-SS0-004 is supplied by Bonpora, a Chinese manufacturer of polyurethane and rubber suspension components, as a replacement part produced to match the OE drawing for Honda front struts. The reference belongs to the 51722 parts group that Honda uses for front-strut bump stoppers, and it is exported to importers, parts distributors and workshop chains worldwide. This page sets out the technical data, the role the component plays inside the strut assembly, how professional buyers verify fitment, and how the factory handles OEM and custom projects from drawing approval to shipment.
The strut bump stop - also called a jounce bumper, bump stopper or suspension bump stop - is the progressive elastomer cushion fitted around the piston rod of a MacPherson strut. It takes over where the coil spring reaches the end of its travel: when the wheel drops into a pothole, crosses a sharp ridge or the suspension compresses under load, the bump stop engages and absorbs the final stage of the stroke. Without a serviceable stop, the damper bottoms out metal-to-metal, transmitting sharp impacts into the vehicle body and accelerating wear on the strut, its top mount and surrounding components.
On the front axle the bump stop slides over the damper rod between the top mount and the dust boot, and on many Honda platforms it is moulded together with the dust cover as a single assembly. The 51722-SS0-004 follows the original geometry: a 12 mm bore seats on the strut rod, the 50 mm outer diameter defines the contact face inside the housing, and the 63 mm free height gives a compact progressive section before full compression. Because this stop is shorter than average, checking all three dimensions against the removed part matters even more, since several Honda references of similar appearance differ in height by only a few millimetres.
Polyurethane bump stops degrade gradually rather than suddenly. Workshop indicators include knocking from the front axle over sharp impacts, a noticeably harsher ride at full compression, and visible cracking, powdering or permanent flattening of the cushion on inspection. Because the part is concealed inside the strut assembly, most workshops check or renew it whenever a strut, top mount or dust boot is already being serviced. A new bump stop is a low-cost safeguard compared with replacing a damper damaged by repeated bottoming, and fitting fresh stops on both sides of an axle keeps the handling balanced.
The published parameters for Bonpora reference 4110044 are listed below.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| OE Number | 51722-SS0-004 |
| Bonpora Nos | 4110044 |
| Fitment | Honda |
| Size | Φ12 × Φ50 × 63 mm |
| Material | Polyurethane (micro-cellular) |
| Country of Origin | China |
| Warranty | 1 year |
| Delivery Time | 15-30 days |
| Packaging | Neutral export packaging |
| Custom Service | OEM & custom design support |
The 51722 prefix belongs to the numbering system Honda applies to front-strut bump stoppers, and the SS0 development code links this reference to Honda Civic model lines of the 1990s generation. Within the family, numeric suffixes such as 003 or 004 identify successive design revisions, so hardware can differ between model years and axle variants even where the base number looks similar. Bonpora therefore recommends confirming fitment with the complete OE number printed or moulded on the original part, or with a parts-catalogue lookup, before placing an order. If the number on your sample carries a different suffix, send it together with your measurements and the engineering team will check whether this reference matches or whether an equivalent should be quoted.
Many buyers search suspension elastomer parts not by vehicle model but by part type and measurements - for example a Honda strut bump stop with a 12 mm bore, or a polyurethane stop of a given outer diameter and free height. Specification-based sourcing works well for bump stops because the three dimensions largely determine whether a part will seat and engage correctly. Measure the inner diameter, outer diameter and free height of the removed component, note the material, and compare these values against the catalogue data. The polyurethane bump stop catalogue lists references with their dimensions and OE numbers, which makes a spec-based cross-check straightforward before an inquiry is sent.
OE-number sourcing remains the most reliable route for imported replacement parts, because numbers are specific while vehicle descriptions are not. The following workflow keeps an inquiry efficient and lowers the risk of mismatched stock.
Provide the full OE number together with inner diameter, outer diameter and free height of the old part. For this reference the expected values are approximately Φ12 mm, Φ50 mm and 63 mm. When all three agree, the stop will seat on the rod and engage at the intended point of the travel.
Micro-cellular polyurethane is the prevailing material for current-generation bump stops because it provides a progressive compression curve and low permanent set. Buyers converting from an original rubber stop may notice a slightly different stiffness feel; sharing the Shore hardness and free height of a reference sample allows the factory to tune the formulation to the application.
For first-time cooperation, dimensional inspection and material verification on samples are the most practical risk controls. Bonpora supports sample approval ahead of batch production, and volume supply runs under IATF 16949-based process control, so inspection records can accompany shipment documents when required.
Purchasing bump stops directly from the moulding factory, rather than through trading intermediaries, gives buyers visibility over the factors that decide batch consistency: tooling condition, material batching and process parameters. Bonpora manufactures the shock absorber parts range in-house, from rubber and polyurethane compounding through to finished-component testing, which means dimension reports can be produced per batch and mould maintenance is scheduled internally. Direct factory supply also simplifies commercial matters such as volume pricing, repeat-order scheduling and neutral export packaging for re-branding at destination. For distributors building a Honda suspension programme across several OE references, one factory covering multiple part families reduces the number of suppliers to qualify and audit.
Beyond catalogue references, the factory develops bump stops and related custom parts from customer drawings, 3D data or physical samples. A typical project covers dimension confirmation, material formulation, hardness matching, pilot moulding and sample approval before mass production begins. Custom service also extends to colour, branding and packaging, which suits importers establishing their own ranges as well as fleet programmes that require batch documentation with every delivery.
Standard shipments use neutral export packaging labelled with the Bonpora number 4110044 for traceability, leaving goods unbranded for distributor re-packing. Delivery time is 15-30 days depending on order quantity and the production schedule, and a 1-year warranty applies to manufacturing defects. Batch traceability information is provided with each shipment, so any delivery can be matched back to production records if a quality question arises during the warranty period.
To obtain pricing for the 51722-SS0-004 strut bump stop, send the OE number, target quantity and destination port through the contact form on this site. A standard quotation includes unit pricing by volume break, packaging specification and the earliest available production slot, so total landed cost can be compared rather than unit price alone.
The reference belongs to the 51722 front-strut bump stopper group of Honda, and the SS0 code links it to Civic model lines of the 1990s generation. Because suffixes identify successive design revisions, fitment should be verified against the complete OE number on the original part or through a parts-catalogue lookup before ordering.
Measure inner diameter, outer diameter and free height. For this reference the approximate values are Φ12 mm, Φ50 mm and 63 mm. Significant deviations usually indicate a different variant, so the OE number should be re-checked before an order is placed.
Yes. OEM and custom design support covers product dimensions, material and hardness, and also colour and branding options on the packaging. Standard shipments remain neutral and unbranded unless custom packaging has been agreed in advance.
A 1-year warranty applies to manufacturing defects, and standard delivery time is 15-30 days after order confirmation, depending on quantity and production schedule. Custom projects may need additional time for sample approval before mass production.
