How much torque does a strut nut need?
There isn't a universal torque for strut nuts; it depends on the vehicle model, nut size, and whether you are dealing with the upper mount or the lower mounting bolts. Always use the OEM specification for your exact model. Typical ranges exist, but the exact value must come from the service manual.
What is a strut nut and where does torque apply?
A strut nut is the fastener that secures parts of the suspension assembly, most notably the nut that clamps the strut rod to the top mount in the strut tower, along with the lower mounting bolts that attach the strut assembly to the steering knuckle or axle. Correct torque ensures proper clamping force, load distribution, and safety. Using the wrong torque can lead to loose components, accelerated wear, or component failure.
Upper mount vs lower mounting bolts
The upper nut secures the strut rod to the top mount inside the strut tower; the lower bolts secure the bottom of the strut to the knuckle. Each fastener has its own torque specification that must be followed precisely from the vehicle’s repair data.
Typical torque ranges you might see
This list provides common ballpark figures for many passenger cars. Exact values vary by model and fastener size, so use the official spec for your vehicle.
- Upper strut mount nut (the nut at the top of the strut): about 25–40 ft-lbs (34–54 Nm).
- Lower mounting bolts to the knuckle/spindle: about 60–90 Nm (45–66 ft-lbs); some vehicles require up to 100 Nm (74 ft-lbs).
- Coilover top-mount nut on adjustable strut assemblies (if present): typically 40–60 Nm (30–45 ft-lbs).
These ranges are general guidelines. Referring to the manufacturer’s spec for your exact model is essential.
How to determine the exact torque for your vehicle
To ensure you have the correct value, consult official repair information for your car. Steps include:
- Identify the exact model year and engine; some specs are year-specific.
- Access the service manual or OEM repair databases (Mitchell1, Alldata, Honda/Toyota/TiS, etc.).
- Look up the suspension section for torque values for the strut mount nuts and lower bolts.
- If using aftermarket components, check the manufacturer’s installation guide for their recommendations and any locking fastener requirements.
- Follow the prescribed torque sequence and any staged tightening procedures, and torque with the suspension in its correct load condition if specified.
After installation, recheck the torque after the vehicle has settled as advised by the manual.
Best practices and safety notes
Important considerations to ensure safety and longevity:
- Replace damaged nuts and fasteners per the manual; reuse is not always allowed.
- Follow the recommended thread lubrication or dry torque requirements; deviations can affect torque readings.
- Torque in the recommended sequence for multi-bolt assemblies and in multiple stages if required by the manual.
- Inspect the surrounding suspension components during reassembly and replace worn parts as needed.
Summary: The torque specification for a strut nut is not universal; it is vehicle- and fastener-specific. Always rely on the official service data for your exact model and ensure proper torqueing procedure for a safe, reliable suspension.
Summary
In short, strut-nut torque is model-specific. Typical upper-mount nuts run in the mid-20s to mid-40s ft-lbs range, while lower mounting bolts are higher, often in the 60–90 Nm (45–66 ft-lbs) range or more. Always verify with the vehicle’s service manual and torque accordingly, rechecking after the suspension settles.
How tight should shock bolts be?
The upper and lower shock mount bolts MUST BE TIGHTENED to a torque value of 210 to 235 ft-lbs (285 to 319 N•m). If the shock mount bolts are not properly tightened, failure of the shock absorber may occur that could damage the suspension and/or its components.
What is the torque strut mount?
What Is a Torque Strut Mount? A torque strut mount stabilizes your engine's position in relation to the chassis. It keeps everything steady while the engine is trying to torque over when the vehicle runs or stops. In short, it lessens the effect of engine torque on your ride's stability.
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 tight should a top strut nut be?
This is MCST1 shock for a N&B Miata. And this is our top mount to get this tight uh MCS likes to do this double nut technique. It's fine but the lowest nut we want to put on with an impact.
