BMW Bonnet Struts
BMW Bonnet Struts
As a professional GASTAC gas spring manufacturer, we provide high-quality BMW bonnet struts designed to restore safe, stable, and effortless hood operation across multiple BMW series. Whether you are replacing worn-out hood struts or sourcing reliable OEM alternatives for bulk supply, GASTAC delivers consistent performance, precise fitment, and long service life. Our bonnet struts are engineered to match OEM specifications while offering flexible customization for B2B applications.
What are BMW bonnet struts?
BMW bonnet struts (also called hood struts or gas struts) are gas-filled support components that help lift and hold the vehicle’s hood (bonnet) open. They are typically mounted on both sides of the engine bay and use compressed gas inside a sealed cylinder to provide lifting force and controlled movement.
Common Problems with BMW Bonnet Struts
Over time, bonnet gas struts lose pressure and performance, leading to safety risks and inconvenience. If your BMW shows any of the following signs, replacement is strongly recommended:
- Hood won’t stay open
- Sudden hood dropping (safety hazard)
- Weak lifting force
- Oil leakage from the strut body
- Difficulty holding hood at full extension
Attention: Replacing both bmw bonnet struts as a pair ensures balanced support and long-term reliability.
Why Choose GASTAC BMW Bonnet Struts
Compared to standard aftermarket options, GASTAC focuses on engineering precision and manufacturing consistency, making us a reliable partner for distributors and OEM buyers. Its core advantages lie in:
- OEM-equivalent performance and dimensions
- Stable gas pressure with long cycle life
- Corrosion-resistant surface treatment
- Strict quality control for batch consistency
- Custom engineering support for special applications
BMW Bonnet Shocks Size Chart OEM
GASTAC supply bonnet shocks compatible with major BMW models, including e30 bonnet struts, e36 bonnet struts, bmw e60 bonnet struts, and bmw e90 bonnet struts. Each strut must correspond to specific OEM requirements, including length, force rating, and mounting type, to guarantee optimal performance and durability. Below are the typical compatibility details and key specifications for BMW bonnet shocks:
| Keyword | Photo | Rod / Tube Ø | Stroke | Extended Length | Force | OEM | Year |
|---|---|---|---|---|---|---|---|
| e30 bonnet struts |  |
8 / 18 mm | 100 mm | 245 mm | 350N | 51231906286 | 1982–1994 |
| e36 bonnet struts |  |
8 / 18 mm | 165 mm | 410 mm | 280N | 51238119558 | 1991-1999 |
| bmw e60 bonnet struts |  |
8 / 18 mm | 113 mm | 313 mm | 580N | 51237008745 | 2001-2010 |
| bmw e90 bonnet struts |  |
8 / 18 mm | 150 mm | 400 mm | 330N | 51237060550 | 2004-2013 |
Note: Specifications may vary depending on hood weight and engine type; OEM numbers are for reference only; Custom sizes and force values are available.
GASTAC vs OEM BMW Bonnet Shocks
GASTAC bonnet shocks are engineered to deliver OEM-equivalent performance while providing stronger advantages in cost efficiency, customization, and stable B2B supply. Below is a clear comparison between GASTAC, OEM BMW manufacturers, and other aftermarket brands.
| Comparison Item | GASTAC | OEM BMW Manufacturer | Other Aftermarket Brands |
|---|---|---|---|
| Performance | OEM-equivalent lifting force, smooth operation | Original factory-calibrated performance | Inconsistent performance |
| Fitment Accuracy | Direct OEM replacement, precise dimensions | Exact OEM fit | May vary, sometimes requires adjustment |
| Material Quality | High-strength steel, anti-corrosion coating | OEM-grade certified materials | Varies by brand |
| Durability | Long service life with stable gas pressure | Designed for full vehicle lifecycle | Medium lifespan |
| Cost Efficiency | Factory-direct competitive pricing | Highest cost (OEM channel) | Higher cost, quality varies |
| Customization | Available (force, size, fittings, OEM/ODM) | Not available | Customizable, Slow response time for small quantities. |
| Supply Stability | Stable mass production, global supply | Controlled OEM supply chain | Stable mass production, global supply |
Interior Technology
- Highest corrosion resistance achieved through powder coated cyclinders and special treated piston rod surfaces.
- Minimal friction for the production of lowest extension forces.
- Great life cycles.
- Protection against vibration and light side forces.
- Integrated grease chamber.
- Low break away forces.
- Installation and storage in any position.
Easy Installation – Replace Your Bonnet Struts in Minutes
GASTAC bonnet struts are designed for quick and hassle-free installation, allowing users to replace worn or failed gas springs without special tools or complex procedures. Each strut is manufactured to OEM-equivalent dimensions, ensuring a direct fit onto the original mounting points. This makes the replacement process efficient for both professional technicians and DIY users. With a plug-and-play design, installation can typically be completed in just a few minutes, restoring smooth hood operation immediately after replacement. Basic Installation Steps:
Step 1: Secure the bonnet in an open position using a support rod or assistant
Step 2: Carefully release the retaining clip or ball joint from the old strut (use a flat tool if necessary)
Step 3: Remove the old bonnet strut from the mounting points
Step 4: Align the new bonnet strut with the OEM mounting ball studs
Step 5: Press firmly until the new bonnet strut clicks securely into place
Step 6: Test bonnet operation to ensure smooth opening and stable support
Technical Features & Engineering Details
- Nitrogen-filled gas spring for stable pressure
- Precision sealing system to prevent leakage
- Hardened piston rod for wear resistance
- Anti-corrosion coating for outdoor durability
- Designed for high cycle life applications
BMW Bonnet Struts FAQ
Q1: What are BMW bonnet struts used for?
BMW bonnet struts are gas springs used to support and lift the engine hood, allowing it to open smoothly and stay in a stable open position without a prop rod.
Q2: Why won’t my BMW bonnet stay open?
This usually happens when the bonnet struts lose gas pressure and can no longer support the weight of the hood.
Q3: How do I know if my BMW bonnet struts are bad?
Common signs include the hood falling down, weak lifting force, or the hood not staying fully open.
Q4: Do I need to replace both BMW bonnet struts at the same time?
Yes. Replacing both ensures balanced support and prevents uneven pressure that can affect hood stability.
Q5: Are BMW bonnet struts the same for all models?
No. BMW E30, E36, E60, and E90 all use different lengths, force ratings, and fittings depending on hood weight and design.
Q6: How do I choose the correct BMW bonnet struts?
You should check your BMW model, year, OEM number, and required force rating. These factors determine correct fitment.
Q7: Can I replace BMW bonnet struts myself?
Yes. Most BMW bonnet struts can be replaced at home using basic tools like a flathead screwdriver in a few minutes.
Q8: What happens if I install wrong bonnet struts?
Wrong struts may cause poor hood support, difficulty closing the hood, or potential damage to mounting points.
Q9: How long do BMW bonnet struts last?
Typically they last 3–5 years depending on usage frequency and environmental conditions.
Q10: Are aftermarket BMW bonnet struts reliable?
High-quality aftermarket struts from professional manufacturers can match OEM performance when properly engineered and tested.
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