The BMW Part Self-locking Collar Nut 31316769731 is a crucial component in BMW vehicles. This self-locking collar nut, also known as an elliptical lock nut, is designed to provide a secure fastening solution for various parts of the vehicle, such as the upper strut and shock mounts. Its unique elliptical shape ensures that it stays in place without the need for additional washers, offering enhanced clamping force and strength.
The self-locking feature also makes it reusable, unlike traditional Nyloc or nylon locking nuts. This part is essential for maintaining the stability and safety of the vehicle’s suspension system, ensuring a smooth and reliable driving experience.
The BMW Part Self-locking Collar Nut 31316769731 is an M8 size hex collar nut with a 13mm hex head. It features an extra-large integrated collar that eliminates the need for a separate washer. The elliptical shape of the collar nut makes it self-locking and reusable, providing a more secure fit compared to traditional Nyloc or nylon locking nuts.
The collar nut is zinc-coated for corrosion protection. It is commonly used on upper strut and shock mounts, spreading its clamping force over a larger area for increased strength. The part is designed to be a direct replacement for part numbers 31-33-0-141-435 and 31-33-1-095-755.
The weight of the part is approximately 0.20 pounds.
BMW 3 Series (E36)
BMW 5 Series (E34)
BMW 7 Series (E32, E38)
BMW 8 Series (E31)
BMW 1 Series (128i, 135i)
BMW 3 Series (318i, 318is, 323Ci, 323i)
BMW M4CSi
BMW 325Ci
BMW 323i
Systems:
Upper strut mounts
Shock mounts
Front axle components
Compatibility:
M8 size with 13mm hex
Elliptical shape for self-locking
Zinc coated for corrosion protection
Gather necessary tools: You will need a socket wrench set, a torque wrench, and safety gloves.
Ensure safety: Wear safety gloves to protect your hands and ensure the vehicle is parked on a flat surface with the engine off.
Locate the self-locking collar nut: Refer to your vehicle’s manual to find the exact location of the self-locking collar nut (part number 31316769731).
Remove the old collar nut: Use the socket wrench to loosen and remove the old self-locking collar nut.
Clean the area: Wipe the area clean to remove any dirt or debris.
Install the new collar nut: Place the new self-locking collar nut in the same position and hand-tighten it.
Use the torque wrench: Use the torque wrench to tighten the self-locking collar nut to the manufacturer’s specified torque.
Double-check: Ensure the collar nut is securely tightened and there is no movement.
Test: Start the vehicle and check for any unusual noises or movement to ensure proper installation.
Regular Inspection: Check the self-locking collar nut for any visible signs of wear or damage during routine maintenance.
Tightness Check: Ensure the nut is securely tightened to the specified torque. Loose nuts can lead to component failure.
Corrosion Prevention: Apply a corrosion inhibitor or protective coating to prevent rust and corrosion.
Cleanliness: Keep the area around the nut clean and free from debris to avoid contamination and ensure proper function.
Replacement: Replace the nut if it shows signs of wear such as stripped threads, deformation, or loss of the self-locking feature.
Signs of Wear:
Stripped threads
Deformation of the collar
Loss of the self-locking feature
Visible corrosion or rust
When to Replace:
If any signs of wear are detected
During routine maintenance if the nut is over a certain age or mileage
If the nut becomes loose or fails to hold components securely
The BMW Part Self-locking Collar Nut 31316769731 is a critical component for maintaining the stability and safety of BMW vehicles’ suspension systems. Its unique elliptical shape provides enhanced clamping force and strength, making it reusable and eliminating the need for additional washers.
The nut is zinc-coated for corrosion protection and commonly used on upper strut and shock mounts.
It is essential to regularly inspect the nut for signs of wear or damage, ensure proper tightening, and apply a corrosion inhibitor to prevent rust and corrosion. If any signs of wear are detected, it should be replaced to maintain the vehicle’s performance and safety.
