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Details
| Specification | Value |
|---|---|
| Brand | S-TR |
| MPN | str-50309 |
| Manufacturer Restriction | z nakretkami |
| Diameter [mm] | 18 mm |
| Length [mm] | 320 mm |
| Width [mm] | 82 mm |
| Thread Size | M18 |
| Thread Size | M18x1.5 |
| Thread Length [mm] | 120 mm |
| Thread Pitch [mm] | 1.5 mm |
| Internal width | 81 mm |
OE numbers (4)
Search by this OE number to find compatible parts
- MERCEDES-BENZ—321 351 11 25
- MERCEDES-BENZ—321 351 14 25
- MERCEDES-BENZ—A 321 351 11 25
- MERCEDES-BENZ—A321 351 14 25
About this product
The S-TR Spring Clamp (STR-50309) is a professional-grade replacement component engineered for long service life and reliable operation across all conditions your vehicle encounters. The part is built to the following specification: Manufacturer Restriction: z nakretkami, Diameter [mm]: Composite mm, Length [mm]: 320 mm, Width [mm]: 82 mm, Thread Size: M18 Thread. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. This part supersedes original equipment references: 010.150, 321 351 11 25, 321 351 14 25, 68954 and 2 more. Matching these numbers confirms a like-for-like replacement with no loss of function. S-TR is a recognised supplier of automotive suspension components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched with tracked delivery and a 14-day money-back guarantee with hassle-free returns.
Suitable cars
Vehicle matches are curated from manufacturer data
Confirmed fits based on manufacturer data.Equivalent products (2)
Spring Clamp S-TR STR-50309 — compatible car models
| Manufacturer article number (MPN) | STR-50309 |
|---|---|
| OE part numbers | 321 351 11 25, 321 351 14 25, A 321 351 11 25, A321 351 14 25 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
S-TR str-50309 . Diameter [mm]: 18 mm. Internal width: 81 mm. Length [mm]: 320 mm. Manufacturer Restriction: z nakretkami. Spring U-bolt Shape: 0. Thread Length [mm]: 120 mm. Thread Pitch [mm]: 1,5 mm. Thread Size: M18
- 1x Spring Clamp
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Tracked standard shipping.
- Standard delivery: 5–9 business days
- Order before 5pm — ships the next working day
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Spring Clamp compatible with my car?
Use the vehicle selector at the top of the page to check compatibility. Enter your car's make, model, and engine — we'll confirm whether this Spring Clamp fits. All fitment data is verified through TecDoc.
What specifications does this S-TR Spring Clamp have?
This S-TR Spring Clamp has the following specifications: Manufacturer Restriction: z nakretkami; Diameter [mm]: 18 mm; Length [mm]: 320 mm; Width [mm]: 82 mm; Thread Size: M18; Thread Size: M18x1,5. Check the full specifications table above for complete details.
What OE part numbers does this Spring Clamp replace?
This Spring Clamp replaces OE part numbers: 321 351 11 25, 321 351 14 25, A 321 351 11 25, A321 351 14 25. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Spring Clamp cost?
This S-TR Spring Clamp is available for £38.99. Spring Clamp prices vary depending on brand, specifications, and vehicle compatibility. S-TR parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Spring Clamp?
Regular inspection of your Spring Clamp is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Spring Clamp?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Spring Clamp fitted by a professional mechanic.
Can I use this part as a replacement for OE 321 351 11 25?
Yes, this S-TR Spring Clamp is a direct replacement for OE part number 321 351 11 25. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Is the S-TR STR-50309 the same as the S-TR STR-1201253?
No, while both are Spring Clamp parts, they are different products. The S-TR STR-50309 has Manufacturer Restriction: z nakretkami, Diameter [mm]: 18 mm, Length [mm]: 320 mm. The S-TR STR-1201253 may differ in dimensions, fitting position, or material composition. Always verify compatibility with your specific vehicle using our vehicle selector, or contact our customer service team for assistance.
