What is the torque for strut bolts?

There is no single torque value that applies to all strut bolts. Torque depends on the vehicle, bolt size and grade, whether the bolt is at the upper mount or the lower mount, and any manufacturer-specific requirements. Always refer to the OEM service manual for the exact specification.

Why torque specs vary

Strut assemblies are secured at two main points: the upper mount to the strut tower and the lower mount to the knuckle or control arm. Each location uses different fasteners that bear different loads during driving, cornering, and braking. Because of the variety in designs across makes and models, there is no universal torque that can cover every vehicle.

Common mounting points and typical ranges

The ranges below reflect common patterns in many cars. The exact figure for your model should come from the factory service data. Values are shown in both newton-meters (Nm) and foot-pounds (ft-lbs).

• Lower strut bolts to the knuckle (often M8–M14 size, high-strength grade): about 80–150 Nm (60–110 ft-lbs).


• Top strut mount bolts/stud nuts to the strut tower (often M8–M12, depending on design): about 25–60 Nm (18–44 ft-lbs).

Use the exact spec from your vehicle to avoid under- or over-torque, which can compromise ride stability and safety.

How to find the exact spec for your vehicle

To get the precise torque for your car, locate the factory service information for your exact model and suspension type. The following steps will guide you to the correct numbers.

1. Identify the exact model, year, engine and suspension configuration.


2. Consult the official repair manual or a trusted database (e.g., Alldata, Mitchell1, Haynes/Chilton, or the OEM dealer portal).


3. Open the suspension or strut replacement section to find torque specs for the lower bolts and the upper mount bolts.


4. Use a calibrated torque wrench and apply the specified torque with the fasteners properly seated and lubricants or threadlocker applied per the manual.

Note: Some manufacturers call for retorquing after the initial road cycle or after a certain number of miles. Always follow the manual's instructions regarding recheck intervals and any lubricant recommendations.

Tools and safety considerations

Having the right tools and following safety practices is essential when torquing strut bolts.

• Calibration of the torque wrench within the manufacturer's specified tolerance.


• Appropriate sockets and extensions for the bolt size and clearance.


• Torque angle gauge if required by the service data.


• Personal protective equipment and secure lifting equipment (jack stands, etc.).

Using the correct tools and following the manual helps ensure the fasteners are seated properly and torqued to spec on every service.

Impact of improper torque

Too little torque can permit movement, causing misalignment and accelerated wear. Too much torque can stretch bolts, damage threads, or crack components. Always respect the official torque value and recheck after initial operation if the manual requires it.

Summary

The torque for strut bolts is vehicle-specific, with no universal figure. By consulting the vehicle’s service manual and following the steps outlined above, you can locate the correct lower and upper mounting torque values, prepare with the right tools, and torque to spec to maintain suspension integrity and safety.

Do struts need to be torqued?

If the strut mounts have bearings, they can “clock” the strut to help with alignment. Once they have everything in place, they should lower the vehicle and use a torque wrench to tighten all nuts and bolts to the correct specifications.

How much torque does a strut nut need?

Strut nut torque specifications vary widely by vehicle and component, so always consult your vehicle's service manual. General specifications for a top strut mount nut often fall within a range, but it's best to confirm with your vehicle's service manual for the exact spec. For example, a common spec is around 474747 ft-lbs, while other applications may require different values.
 
This video demonstrates how to tighten strut and shock top nuts: 57sVorshlagYouTube · Oct 31, 2016
Factors that influence torque specs

• Vehicle and component: Different manufacturers have different specifications for their struts and mounting hardware. 
• Nut size: The size of the nut is a major factor. For example, a top nut may have a torque of 343434 ft-lbs for an M12 nut and 545454 ft-lbs for an M14 nut. 
• Hardware type: The type of hardware, such as OEM vs. aftermarket, can also affect the torque specification. 
• Strut type: Some specialized suspension components may have their own specific torque requirements, such as a cartridge nut that requires 130130130 Nm of torque. 

Important considerations

• Consult the service manual: Always refer to your vehicle's service manual for the correct torque specification. 
• Measure the nut: If you need to find the specification but are unsure, measure the diameter of your top nut or the threaded rod to determine the nut size (e.g., M12, M14). 
• Do not overtighten: Be careful not to overtighten the nut, as this could damage the strut or other components. 
• Use a torque wrench: Use a torque wrench to ensure you tighten the nut to the correct specification. 
• For top mount nuts: After applying the correct torque, you may need to tighten the nut an additional half to one full turn, depending on the vehicle's design and manufacturer recommendations. 

What is the torque strut mount?

A torque strut mount is a part of your vehicle's engine mounting system that secures the engine to the chassis, controls its twisting motion during acceleration and braking, and dampens vibrations. By stabilizing the engine, it contributes to a smoother ride and protects other engine components from excess stress and damage. A failing torque strut mount can lead to symptoms like excessive engine vibration, clunking noises, and poor acceleration.
 
You can watch this video to learn about the symptoms of a bad strut mount: 57sFixITYouTube · Jan 12, 2025
Function

• Stabilizes the engine: It prevents the engine from rocking or twisting excessively when the vehicle starts, stops, or accelerates. 
• Dampens vibrations: It absorbs vibrations from the engine and transmission to provide a smoother ride for the driver and passengers. 
• Protects other components: By limiting engine movement, it prevents premature wear on other parts like sensors, gaskets, and hoses. 

Symptoms of a bad torque strut mount

• Increased vibration: You may feel excessive shaking through the steering wheel or chassis, especially while idling or accelerating. 
• Noise: You might hear clunking or banging sounds, particularly when starting, stopping, or turning. 
• Poor performance: Acceleration can feel sluggish, and the vehicle's handling may be negatively affected. 
• Alignment issues: Excessive movement can lead to misalignment between the engine and other drivetrain components. 

This video explains the purpose of an engine torque mount: 15sWrenching MafiaYouTube · Oct 23, 2023

How much torque for suspension bolts?

Set your torque wrench to the recommended specification, between 35 and 90 foot-pounds depending on the weight rating of your suspension system. Using a 3/4" socket, tighten the U-bolts in a clockwise direction.