What torque should a CV axle nut be?

The recommended torque for a CV (constant velocity) axle nut is typically between 150-250 ft-lbs (203-339 Nm). This specific torque range is crucial to ensure the proper functioning and safety of the CV joint and axle assembly.

Understanding CV Axle Nuts and Torque Requirements

The CV axle nut is responsible for securing the CV joint to the vehicle's hub or differential. Proper torque is essential to prevent the nut from loosening, which could lead to the axle separating from the vehicle, potentially causing a dangerous situation.

The specific torque range for a CV axle nut can vary depending on the vehicle make, model, and year, as well as the size and design of the axle and components. It is important to always refer to the manufacturer's recommended torque specifications for the particular vehicle being serviced.

Factors to Consider When Tightening a CV Axle Nut

• Axle Size: Larger axles typically require higher torque values to ensure a secure connection.


• Thread Size: The thread size of the axle and nut will also affect the recommended torque.


• Lubrication: Applying a small amount of lubricant to the threads can help achieve the proper torque more easily.


• Accessibility: The accessibility of the nut can impact the ability to apply the correct torque, as some locations may be more difficult to reach.


• Tool Type: Using the appropriate tool, such as a torque wrench, is crucial for accurately tightening the nut to the recommended specification.

It is important to follow the manufacturer's guidelines and use the proper tools to ensure the CV axle nut is tightened to the correct torque. Failure to do so can lead to premature wear, component failure, and potentially dangerous situations on the road.

Do CV axles need to be torqued?

Fasteners or other mating surfaces of the CV axle transmission. Or even the wheel. Hub.

Can you over tighten a CV axle nut?

If the drive axle nut is over-tightened, this will create excessive preload on the bearing and insufficient internal bearing clearances, which can also result in bearing noise complaints and excessive heat buildup in the bearing, premature wear, and failure of the hub bearing.

How tight should an axle nut be?

The correct tightness for an axle nut depends on the vehicle, but a general rule is to tighten it enough to eliminate all play and wobble, then back it off slightly until the wheel spins freely without resistance, and secure it with a lock washer or cotter pin. For specific applications like trailer axles, the process involves initial high torque, followed by a significant backing off, and then re-tightening to a specific slot for the cotter pin. Always refer to your vehicle's manufacturer specifications for the precise torque value and procedure.
 
General guidelines
You can watch this video to learn about the general guidelines for tightening axle nuts: 38sMobile RV Tech Services (Radar Road Warriors)YouTube · Oct 9, 2023

• Eliminate wobble: First, tighten the nut to firmly seat the bearings and eliminate any side-to-side play. 
• Ensure free spinning: After tightening, loosen the nut until the wheel can spin freely without any additional resistance from the bearing assembly. 
• Use a locking mechanism: Secure the nut with a cotter pin, locking washer, or a designated locking nut to prevent it from loosening further. 

Specific applications

• Trailer axles:
  • Tighten the spindle nut to the specified torque (e.g., 50 ft-lbs for some Dexter axles) while rotating the hub. 
  • Loosen the nut completely, then finger-tighten it until it's snug. 
  • Back the nut off to the first available slot that aligns with the hole for the cotter pin. 
  • Insert the cotter pin and bend its legs to secure the nut. 
• Bicycles (through-axles):
  • Follow the manufacturer's recommended torque value, which is often in the range of 9–13 Nm for stealth-type through-axles. 
  • Do not overtighten, as this can damage the fork or frame dropouts. 

Important considerations

• Check the manufacturer's specifications: Always consult your vehicle's service manual for the correct torque specification and procedure, as these can vary significantly. 
• Avoid overtightening: Overtightening can cause premature bearing wear and failure. 
• Avoid undertightening: Looseness can lead to damage to the axle and hub. 
• Re-check the tightness: It's a good practice to re-check the axle nut tightness after the first 50–100 miles of driving. 

How much torque for a CV axle nut?

There is no single torque value for a CV axle nut; it varies significantly depending on the vehicle, so you must consult the vehicle's specific service manual for the correct torque specification. Typical values can range from approximately 130 to 300 foot-pounds (ft-lbs), with some applications having lower specifications between 85–170 ft-lbs. 
This video explains why there is no single torque value and shows examples of different procedures: 1mBCA Bearings by NTNYouTube · Jun 15, 2022
Why torque specifications vary

• Vehicle-specific: Different makes, models, and even drive types (like 2WD vs. 4WD) have unique requirements. 
• Bearing design: The type of wheel bearing (tapered vs. ball bearing) and its design affects the required torque. 
• Preload settings: The torque setting is critical for achieving the correct wheel bearing preload, which prevents premature wear and failure. 
• Factory settings: Some pre-assembled hub units have their preload set at the factory, but the final nut torquing is still necessary for proper component seating. 

How to find the correct torque

• Service manual: The most reliable method is to check the service manual specific to your vehicle. 
• Online resources: Search online for your vehicle's make and model to find the specific torque spec. 
• Part supplier booklet: Some new hub assemblies come with a booklet that lists the required torque for many applications. 

Important tips

• Use the correct torque wrench: Use a calibrated torque wrench with a suitable range for the required specification. 
• Follow the procedure: Some procedures require the vehicle's weight to be on the wheels during torquing. 
• Avoid over-torquing: Overtightening can cause excessive heat, pressure, and premature bearing failure. 
• Avoid under-torquing: A nut that is too loose can lead to premature failure.