Don't Buy the Wrong Strut: Guide to Sizing & Ordering Gas Struts

Gas struts—also known as gas springs or lift supports—are essential components in modern vehicles, providing controlled movement for bonnets (hoods), tailgates (boots), doors, and even seating mechanisms. Though they may look simple, choosing the correct replacement strut is vital for safety, smooth operation, and long service life. An incorrect choice can lead to poor performance, damage to your vehicle, or even personal injury. This guide from Nitrolift walks you through everything you need to know to identify and order the right gas strut for your vehicle.

Key Gas Strut Specifications

Choosing the correct gas strut requires carefully matching the following five core specifications to your application, ensuring safe, reliable, and smooth operation.

• Length: The extended length is crucial for correct installation and function. A length that is too long or too short will cause poor operation and premature wear on the strut and hinges.
• Stroke: This is the distance the strut travels between its fully compressed and fully extended positions. The stroke must allow the component (bonnet, tailgate, etc.) to open completely without putting strain on the mechanism.
• Force (Newtons): This represents the pushing power of the strut. Too little force will result in heavy, sluggish movement, while excessive force risks damaging hinges or causing sudden, uncontrolled movement.
• Mounting Type: Struts come with various end fittings, including ball studs, clevis pins, or threaded ends. The replacement strut must precisely match the vehicle's existing mounting points for a secure fit.
• Compressed & Extended Lengths: These specific measurements ensure the strut fits correctly within its housing when the application is both fully open and fully closed.

Finding the OEM Part Number

The most reliable and accurate way to identify the correct replacement strut is by locating the **OEM (Original Equipment Manufacturer) part number** on the existing unit.

• Where to Look: The part number is usually clearly **stamped or printed on the main cylinder body** of the strut.
• Cleaning Tip: If dirt or grime makes the number unreadable, **wipe the cylinder clean** with a mild solvent or degreaser before taking a reading.
• Multiple Struts: For applications like tailgates or larger components that use two struts, **check both units**. Do this to confirm they are identical or if they have different part numbers.
• Photos: Take **clear, well-lit photos** of the OEM number and any other markings for easy reference when ordering.

Ordering with the OEM Part Number

Once you have accurately identified the OEM part number, ordering the correct replacement strut becomes a straightforward process:

• Online: Search trusted and reputable parts suppliers and simply enter the full part number into their search bar to find the exact replacement you need quickly.
• Local Suppliers: Provide the OEM part number to the staff at your local auto parts shop or trade counter for a direct and fast match.
• Vehicle Manufacturer: If the part is difficult to find through general suppliers, you can contact the vehicle manufacturer directly to source an original replacement.

If the OEM Number is Missing

It is common for the OEM part number to be worn away, illegible, or completely missing due to environmental wear. If you cannot find the number, use these reliable alternative methods:

• Precise Measurements: Accurately record the key dimensions of the old strut, specifically the **compressed length**, **extended length**, **stroke length**, and the **mounting style** (e.g., 10mm ball socket, clevis).
• VIN Number: Supplying your **Vehicle Identification Number (VIN)** to parts specialists can help them cross-reference the exact part fitted to your vehicle during manufacturing.
• Vehicle Details: Provide the **make, model, year, and the specific component type** (e.g., Nissan Qashqai, 2018, Tailgate) to significantly narrow down the available options.
• Visual Comparison: Compare your strut against clear images or technical diagrams found online to identify the correct mounting ends and general size.
• Contact Nitrolift Experts: Our dedicated team can help identify the right replacement using your measurements and a clear photo of the old strut, ensuring you get the perfect match.

Why Struts Vary?

Even the same vehicle model can use different struts depending on year of manufacture, trim, or design changes. This is why the OEM part number remains the most reliable method.

Why the Correct Strut Matters

Using the wrong gas strut can lead to a variety of operational problems and serious safety risks. It is essential to ensure a precise match to avoid the following consequences:

• Poor Operation: The bonnet or tailgate may not open fully, may close too quickly, or may require difficult manual lifting and assistance to operate smoothly.
• Vehicle Damage: Struts with too much force (Newtons) can place excessive strain on hinges, mounting points, and locking catches, potentially leading to costly vehicle repairs.
• Safety Risks: A failed or incompatible strut poses a serious safety hazard, as a heavy panel could fall suddenly and unexpectedly.
• Warranty Issues: Fitting non-compatible or incorrectly specified components can, in some cases, void the manufacturer’s warranty on your vehicle or component.

Installation

Once you've ordered the correct struts from Nitrolift, installation is usually straightforward. Many people replace them at home, but always check your vehicle manual for specific instructions. If unsure, consult a qualified mechanic for safe fitting.

Ordering the correct gas strut is all about precision. Start with the OEM part number whenever possible. If it's missing, accurate measurements and vehicle details will help specialists like Nitrolift supply the right solution. Replacing your struts with the correct parts ensures safety, smooth operation, and long-term durability.