BMW M5 2018-present Suspension Bolt Torque Specifications
Detailed torque specifications for all suspension bolts on the 2018-Present BMW M5 (F90 generation). Includes front and rear suspension components.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
Always use a calibrated torque wrench and follow specifications exactly.
Incorrect Torque Sequence
Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
Clean and inspect all threads before assembly. Use new thread locker if specified.
Reusing TTY Bolts
Torque-to-yield bolts are designed to stretch and must not be reused.
Always replace TTY bolts with new ones. They are single-use only.
Dry vs. Lubricated
Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
Search Specifications
Search by component name, bolt size, or description
Torque Calculator
Convert between different torque units
Front Suspension
Torque specifications for various components of the front suspension system, including struts, control arms, and steering linkages.
1 Front Strut/Shock Absorber Upper Mounting Bolts
M10 x 1.5
Front Strut/Shock Absorber Upper Mounting Bolts
M10 x 1.5Torque Value
Important Notes
2 Front Strut Pinch Bolt (Lower)
M14 x 1.5
Front Strut Pinch Bolt (Lower)
M14 x 1.5Important Notes
3 Lower Control Arm to Subframe Bolt
M14 x 2.0
Lower Control Arm to Subframe Bolt
M14 x 2.0Torque Value
Important Notes
4 Upper Control Arm to Knuckle Bolt
M12 x 1.75
Upper Control Arm to Knuckle Bolt
M12 x 1.75Torque Value
Important Notes
5 Ball Joint Nut
M12 x 1.5
Ball Joint Nut
M12 x 1.5Torque Value
Important Notes
6 Tie Rod End Nut
M12 x 1.5
Tie Rod End Nut
M12 x 1.5Torque Value
Important Notes
7 Sway Bar Link Nut
M10 x 1.5
Sway Bar Link Nut
M10 x 1.5Torque Value
Important Notes
Rear Suspension
Torque specifications for various components of the rear suspension system, including shocks, control arms, and subframe mounts.
1 Rear Shock Absorber Lower Mounting Bolt
M12 x 1.75
Rear Shock Absorber Lower Mounting Bolt
M12 x 1.75Torque Value
Important Notes
2 Lower Control Arm to Knuckle Bolt
M14 x 2.0
Lower Control Arm to Knuckle Bolt
M14 x 2.0Torque Value
Important Notes
3 Upper Control Arm to Knuckle Bolt
M12 x 1.75
Upper Control Arm to Knuckle Bolt
M12 x 1.75Torque Value
Important Notes
4 Sway Bar Link Nut
M10 x 1.5
Sway Bar Link Nut
M10 x 1.5Torque Value
Important Notes
Subframe
Torque specifications for subframe mounting bolts and related components.
1 Subframe Mounting Bolts
M14 x 2.0
Subframe Mounting Bolts
M14 x 2.0Torque Value
Important Notes
2 Sway Bar Bushing Bracket Bolts
M8 x 1.25
Sway Bar Bushing Bracket Bolts
M8 x 1.25Torque Value
Important Notes
Sensors
Torque specifications for wheel speed sensor mounting bolts.
1 Wheel Speed Sensor Mounting Bolts
M6 x 1.0
Wheel Speed Sensor Mounting Bolts
M6 x 1.0Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Loose Components
Symptoms:
- Rattling or vibration noises
- Visible movement in components
- Uneven panel gaps
Solutions:
- Clean threads and mounting surfaces
- Replace damaged fasteners
- Apply proper torque in sequence
- Use thread locker if specified
Stripped Fasteners
Symptoms:
- Unable to achieve proper torque
- Fastener spins freely
- Visible thread damage
Solutions:
- Use thread repair kit if appropriate
- Install thread insert (HeliCoil)
- Replace component if threaded hole is damaged
- Upgrade to higher grade fastener if recommended
Overtightened Components
Symptoms:
- Cracked or deformed parts
- Broken fasteners
- Compressed gaskets or seals
Solutions:
- Replace damaged components
- Use new fasteners
- Follow proper torque sequence
- Verify correct torque specifications
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Visual Inspection
Inspect the affected area for any visible signs of damage or wear
- Check for cracks or deformation
- Look for signs of excessive wear
- Verify proper fastener installation
Torque Verification
Verify the torque applied to the fasteners
- Check the torque wrench calibration
- Verify the torque specification
- Compare the applied torque to the specification
Thread Assessment
Assess the condition of the threads
- Check for signs of thread damage
- Verify the thread type and size
- Check for proper thread engagement
Prevention Guidelines
Best practices, maintenance tips, tool care
Prevention Guidelines
Best practices, maintenance tips, tool care
Best Practices
- Always follow the recommended torque specification
- Use the correct type and size of fasteners
- Verify the torque wrench calibration regularly
Maintenance Tips
- Regularly inspect the affected area for signs of wear or damage
- Replace damaged or worn-out components promptly
- Keep the work area clean and organized
Tool Care
- Regularly clean and maintain the torque wrench
- Store the torque wrench in a dry and secure location
- Verify the torque wrench calibration before each use
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Why are torque specifications important for suspension bolts?
Why are torque specifications important for suspension bolts?
Correct torque ensures that suspension components are securely fastened and function as designed. Under-torquing can lead to loosening and movement, causing noise, instability, and potentially component failure. Over-torquing can stretch or damage bolts, leading to failure and impacting the structural integrity of the suspension system, potentially causing a loss of control. In the case of the M5, these forces are significantly higher than a normal vehicle.
Q2 What happens if I over-torque a suspension bolt?
What happens if I over-torque a suspension bolt?
Over-torquing a suspension bolt can result in several issues. Firstly, it can damage the bolt itself by exceeding its yield strength, which is the point beyond which the bolt will permanently deform or break. It can also deform the threads in the receiving component leading to a weakened connection. Secondly, it can negatively affect the mating surface, distorting it and thus altering the intended geometry. Lastly, this can lead to a catastrophic failure of the suspension which may include a loss of control of the vehicle. Therefore it is essential to adhere to the specified torque.
Q3 What happens if I under-torque a suspension bolt?
What happens if I under-torque a suspension bolt?
Under-torquing a suspension bolt will not provide enough clamping force to keep the components secure under load. Over time, this can lead to the bolt loosening and creating play in the suspension. This will cause knocking noises, degraded handling, accelerated wear of the suspension components, and potentially complete loss of control. In the M5, this is especially critical as the high performance will place a higher demand on the suspension components.
Q4 Should I use new bolts when working on the suspension?
Should I use new bolts when working on the suspension?
BMW recommends replacing certain critical suspension bolts (specifically those that are torque-to-yield or stretch bolts) whenever they are loosened. These bolts stretch upon tightening to a specific torque, ensuring a secure connection. Reusing them can result in improper clamping force, as they can become permanently deformed. When the correct torque is applied to used bolts, the clamping force may not be correct and will increase the risk of failure, or the bolt failing completely. Check the BMW repair manual or TIS for specific bolt replacement recommendations for the 2018+ M5.
Q5 How often should I check the torque on my suspension bolts?
How often should I check the torque on my suspension bolts?
It's a good practice to check suspension bolt torque after any significant work on the suspension system, such as component replacement or adjustments. Additionally, performing a periodic check, such as annually or every 12,000 miles, is recommended, particularly for a high-performance vehicle like the M5. If you notice any unusual noises or handling issues, inspect the bolts immediately.
Q6 Is it acceptable to use impact guns on suspension components?
Is it acceptable to use impact guns on suspension components?
Impact guns should generally NOT be used for tightening suspension bolts, especially not for the final tightening. While impact guns can help get the bolt most of the way in, it is very difficult to control the torque. Always use a calibrated torque wrench to achieve the correct final torque specification. Improper tightening can damage components and/or result in a potentially catastrophic failure.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature can significantly impact torque values and fastener behavior
Cold Weather
Effects:
- Increased material brittleness
- Higher torque required due to thread contraction
- Reduced thread lubricant effectiveness
Recommendations:
- Allow components to warm to room temperature when possible
- Consider using winter-grade thread lubricants
- Check torque values more frequently during winter months
Hot Weather
Effects:
- Thermal expansion of components
- Decreased friction in threads
- Accelerated lubricant breakdown
Recommendations:
- Check torque when components are at normal operating temperature
- Use temperature-resistant thread lockers
- Consider re-torquing after heat cycles
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Moisture and corrosion can affect fastener integrity and torque values
High Humidity
Effects:
- Accelerated corrosion formation
- Reduced friction coefficient
- Potential thread seizing
Prevention:
- Use corrosion-resistant fasteners
- Apply appropriate anti-seize compounds
- Maintain proper protective coatings
Salt Exposure
Effects:
- Rapid corrosion development
- Thread damage
- Seized fasteners
Prevention:
- Regular underbody washing
- Use of sacrificial anodes where appropriate
- Application of protective coatings
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Spring
- Inspect for winter damage
- Clean and protect exposed fasteners
- Check torque on critical components
Summer
- Monitor heat-affected components
- Check expansion-related loosening
- Inspect cooling system mounts
Fall
- Prepare for winter conditions
- Apply corrosion protection
- Verify all fasteners are properly torqued
Winter
- More frequent inspection of critical fasteners
- Check for salt damage
- Monitor suspension component torque
Related Resources
Tools, service procedures, and technical bulletins
Recommended Tools
Torque Wrench (1/2" Drive)
A high-quality torque wrench is essential for accurately tightening suspension bolts to their specified torque values. A 1/2" drive is recommended for the necessary range.
- Accurate torque settings
- Wide torque range (typically 20-200 Nm)
Torque Wrench (3/8" Drive)
A smaller 3/8" drive torque wrench can be useful for lower torque fasteners. Usually more accurate in this range.
- Accurate torque settings
- Suitable for lower torque fasteners (typically 5-50 Nm)
Socket Set (Metric)
A comprehensive set of metric sockets is required to fit the various bolt heads on the BMW M5 suspension.
- Wide range of sizes
- 6-point sockets for optimal grip
Socket Extensions
Extensions are needed to reach recessed fasteners.
- Various lengths for accessibility
- Durable construction
Universal Joint Adapter
A universal joint is helpful for tightening bolts at awkward angles.
- Allows for angled access
- Robust build quality
Hex Bit Socket Set
For control arms and other suspension components that utilize hex head fasteners.
- Full metric sizing
- 6-point sockets
Service Procedures
Front Strut Assembly Removal and Installation
Detailed steps for removing and installing the front strut assembly, including torque specifications for all associated fasteners.
- Loosen wheel bolts
- Raise and support the vehicle securely
- Remove wheel
- Disconnect any wiring or sensors attached to the strut
- Remove bolts securing the strut to the knuckle
- Remove upper strut mount bolts
- Carefully remove the strut assembly
- Install new or recondition strut and tighten bolts to proper spec.
Rear Control Arm Removal and Installation
Detailed steps for removing and installing the rear control arm, including torque specifications for all associated fasteners.
- Loosen wheel bolts
- Raise and support the vehicle securely
- Remove wheel
- Remove any associated brackets or covers to access the control arm
- Loosen but do not remove fasteners securing control arm to the subframe and knuckle
- Remove fasteners securing the control arm completely
- Remove control arm
- Install new or recondition control arm and tighten bolts to proper spec
Front Sway Bar Link Removal and Installation
Detailed steps for removing and installing the sway bar links, including torque specifications for all associated fasteners.
- Loosen wheel bolts
- Raise and support the vehicle securely
- Remove wheel
- Loosen but do not remove nuts/bolts securing the sway bar link
- Remove fasteners securing the sway bar link completely
- Remove sway bar link
- Install new or recondition sway bar link and tighten bolts to proper spec.
Rear Sway Bar Removal and Installation
Detailed steps for removing and installing the rear sway bar, including torque specifications for all associated fasteners.
- Loosen wheel bolts
- Raise and support the vehicle securely
- Remove wheel
- Loosen but do not remove nuts/bolts securing the sway bar link and mounts
- Remove fasteners securing the sway bar link and mounts completely
- Remove sway bar
- Install new or recondition sway bar and tighten bolts to proper spec.
Technical Service Bulletins
Suspension Component Fastener Corrosion
2020-07-15Some 2018-2020 BMW M5 models may experience corrosion on certain suspension fasteners, potentially leading to inaccurate torque readings or failure. Inspection and replacement are recommended where corrosion is found.
Resolution: Inspect and replace corroded fasteners with new, properly lubricated hardware, and torque to specified values.
Front Strut Mount Noise and Wear
2021-11-22Reports of clicking or creaking noises from the front strut mounts have been reported. Inspection of the strut mount and associated hardware is required. May lead to premature wear of the components.
Resolution: Inspect and replace worn strut mounts, checking all fasteners for the correct torque specifications. Proper torquing techniques and sequence are critical
Rear Suspension Alignment Issues
2023-03-01Some reports of rear alignment issues post service on suspension components have been made. Improper torque sequences of suspension fasteners are being evaluated as a possible cause. Proper tightening sequences should be followed.
Resolution: Review the proper torque sequences and specifications for rear suspension components. Follow proper tightening techniques. Alignment is recommended after major component replacement.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.