BMW 340i 2005-2011 Suspension Bolt Torque Specifications & Fastener Values
BMW 340i 2005-2011

BMW 340i 2005-2011 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 2005-2011 BMW 3 Series (E90, E91, E92, E93) platform. Includes front and rear suspension component torques.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

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.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

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.

Prevention:

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.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

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

Strut Shock Absorber

Torque specifications for bolts and nuts related to the strut and shock absorber assemblies, including mounting points and top mounts.

1

Strut/Shock Absorber Mounting Bolts (Lower)

M14 x 2.0
Torque Value
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the lower end of the strut/shock to the steering knuckle. Torque value is an estimate and may vary based on bolt size and design. Always refer to the vehicle specific service manual.
2

Strut/Shock Absorber Top Mount Nut(s)

M10 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
These nuts secure the top of the strut/shock assembly to the vehicle frame or strut tower. Torque value is an estimate and may vary depending on the specific design and presence of a rubber mount. Always refer to the vehicle specific service manual.

Control Arms

Torque specifications for bolts related to the control arm assembly, including mounting points to the frame and ball joint attachments.

1

Control Arm Mounting Bolts

M14 x 2.0
Torque Value
52 ft-lbs (70 N·m)
Important Notes
These bolts secure the control arm to the vehicle's frame or subframe. This is a critical torque spec for proper suspension geometry. Always refer to the vehicle specific service manual.
2

Lower Control Arm Ball Joint Mounting Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
These bolts secure the ball joint to the control arm. Torque value is an estimate and may vary depending on specific design. Always refer to the vehicle specific service manual. This should be double-checked to make sure the ball joint is securely fastened to the control arm.
3

Steering Knuckle to Control Arm Mounting Bolt

M14 x 2.0
Torque Value
60 ft-lbs (81 N·m)
Important Notes
This bolt connects the steering knuckle to the control arm. Torque value is an estimate and may vary based on bolt size and design. Always refer to the vehicle specific service manual.

Steering

Torque specifications for bolts and nuts related to steering components, including ball joints and tie rod ends.

1

Ball Joint Nut

M12 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
This nut secures the ball joint stud to the steering knuckle. Proper torque ensures correct joint operation. Always refer to the vehicle specific service manual.
2

Tie Rod End Nut

M12 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Proper torque is essential for maintaining steering alignment and preventing play. Always refer to the vehicle specific service manual.

Sway Bar

Torque specifications for bolts and nuts associated with the sway bar, including link connections and mounting brackets.

1

Sway Bar Link Nut

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
These nuts secure the sway bar links to the sway bar and to the strut or control arm. Proper torque is critical for effective sway bar function. Always refer to the vehicle specific service manual.
2

Sway Bar Mounting Bracket Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
These bolts secure the sway bar mounting brackets to the chassis or subframe. Proper torque ensures the sway bar is secure and effective. Always refer to the vehicle specific service manual. Torque value is an estimate and may vary.

Subframe

Torque specifications for bolts related to mounting the subframe to the vehicle chassis.

1

Subframe Mounting Bolts

M14 x 2.0
Important Notes
These bolts secure the subframe to the vehicle chassis. Proper torque and angle are critical for chassis integrity and handling. Always refer to the vehicle specific service manual. Torque value may vary depending on the subframe design. Improper torque can cause chassis flex, unsafe handling and vibrations.

Wheel Hub

Torque specifications for bolts securing the wheel hub/bearing assembly to the steering knuckle.

1

Wheel Hub/Bearing Mounting Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the wheel hub/bearing to the steering knuckle. Proper torque is essential to prevent play, premature bearing failure, or even wheel separation. Always refer to the vehicle specific service manual. Torque value may vary depending on the hub/bearing design.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

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

1

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
2

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
3

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

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 correct torque specifications important for suspension bolts?

Correct torque ensures proper clamping force, preventing bolts from loosening due to vibration or stress, which could lead to suspension component failure, compromised handling, and potential accidents. Overtightening can damage threads, bolts, or the components they secure.

Q2

What happens if I overtighten a suspension bolt?

Overtightening can stretch or break the bolt, strip the threads in the receiving component (like the control arm or knuckle), or cause deformation of the component itself. This can lead to premature failure, instability, and costly repairs. For example, an overtightened lower control arm bolt might crack the aluminum arm mount.

Q3

What happens if I undertighten a suspension bolt?

Undertightened bolts may loosen over time due to road vibrations and load, leading to movement between parts and causing noises, premature wear, and compromised handling. In severe cases, components can separate. For example, an undertightened sway bar link could cause clunking noises and poor handling around corners.

Q4

Should I use new bolts when reassembling suspension components?

It's highly recommended to use new, torque-to-yield bolts (TTY) or those specified for single-use if the manufacturer recommends it. These bolts are designed to stretch when tightened and provide optimal clamping force, and should not be reused. Reusing them may not provide the correct clamping force and could fail. Examples of TTY bolts often used in suspension include strut to knuckle bolts and subframe bolts.

Q5

Do I need special tools to tighten suspension bolts?

Yes, a calibrated torque wrench is crucial for achieving the correct torque specifications. A generic wrench will not provide the necessary precision. Also, ensure you use the correct socket for the bolt. A crows foot wrench may be required in some situations. A torque angle gauge or wrench may also be required for torque-to-yield bolts.

Q6

Do torque specifications vary between different suspension components?

Yes, torque specifications are specific to each bolt and component. For example, the torque for the sway bar end link will be different from the torque for the lower control arm ball joint. Always consult the vehicle's service manual for the correct values. Using the wrong torque on any of these bolts can lead to serious damage or failure.

Q7

How often should I check the torque on suspension bolts?

It's good practice to check torque on suspension bolts, particularly after any suspension work. Ideally, recheck the torque after a short drive (e.g., 50-100 miles) to ensure they've remained tightened. Regular inspections during routine maintenance may also be beneficial, especially if you frequently drive on rough roads. A common scenario is when after replacing the strut assembly, the lower strut bolt should be checked after a short drive.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

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

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

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 calibrated torque wrench is essential for accurately tightening suspension bolts to the manufacturer's specifications. A 1/2 inch drive is recommended for the torque ranges typically found in suspension work.

  • Click-type or digital torque wrench
  • Torque range suitable for BMW suspension components (20-150 ft-lbs recommended)
  • Calibration certificate recommended
Learn more

Torque Wrench (3/8" Drive)

A 3/8 inch drive torque wrench is useful for smaller fasteners in the suspension system.

  • Click-type or digital torque wrench
  • Torque range suitable for smaller suspension components (5-80 ft-lbs recommended)
  • Calibration certificate recommended
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolt head sizes found on BMW suspensions. Deep sockets are also helpful for some locations.

  • Metric sizes ranging from 8mm to 22mm
  • Standard and deep sockets
  • 6-point sockets for optimal grip
Learn more

Wrench Set (Metric)

A set of metric wrenches are needed for certain bolt head locations or for counter holding when tightening fasteners

  • Metric sizes matching sockets
  • Combination wrenches or offset wrenches may be needed
  • Open and boxed ends required
Learn more

Jack Stands

Sturdy jack stands are critical for safely supporting the vehicle while working on the suspension.

  • Rated for the weight of the BMW 3-series
  • Adjustable height
  • Wide base for stability
Learn more

Vehicle Jack

A suitable jack is needed to lift the vehicle for access to the suspension

  • Rated for the weight of the BMW 3-series
  • Low profile to get under the jacking points
  • Stable lifting design
Learn more

Pry Bar

A pry bar may be helpful to align suspension components while tightening bolts

  • Multiple lengths useful
  • Good leverage for alignment
  • Sturdy construction
Learn more
Service Procedures

Front Strut Bolt Torque Procedure

Proper torque on the front strut bolts is critical for safety and handling. This procedure outlines the tightening steps.

  • 1. Loosen the wheel lug bolts with the vehicle on the ground.
  • 2. Safely lift the vehicle and secure it on jack stands.
  • 3. Remove the wheel.
  • 4. Locate the strut-to-steering knuckle bolts.
  • 5. Use the appropriate socket to tighten the bolts in a cross pattern to the specified torque. See table below
  • 6. Reinstall the wheel.
  • 7. Lower the vehicle and torque the lug nuts to spec.
View full procedure

Rear Control Arm Bolt Torque Procedure

Proper tightening of rear control arm bolts is critical for vehicle alignment and suspension stability.

  • 1. Safely lift the vehicle and secure it on jack stands.
  • 2. Locate the rear control arm bolts.
  • 3. Use the appropriate socket to tighten the bolts to the specified torque. See table below
  • 4. Ensure all other fasteners are torqued to specification
  • 5. Lower the vehicle to the ground.
View full procedure

Sway Bar End Link Bolt Torque Procedure

Proper torque on sway bar end link bolts ensures proper sway bar function

  • 1. Safely lift the vehicle and secure it on jack stands.
  • 2. Locate the sway bar end link bolts.
  • 3. Using a wrench and appropriate socket, tighten bolts to specification. See table below
  • 4. Lower the vehicle to the ground.
View full procedure
Technical Service Bulletins

Suspension Bolt Torque Values - E90 Chassis

2006-07-15

This bulletin provides torque specifications for various suspension components on the E90 chassis, including updated values for specific fasteners.

2006-2011 BMW 3 Series (E90)

Resolution: Refer to the following table for accurate torque values: * **Front Strut to Steering Knuckle Bolts:** 81 Nm + 90 degrees * **Front Upper Control Arm to Frame:** 81 Nm + 90 degrees * **Front Lower Control Arm to Frame:** 81 Nm + 90 degrees * **Rear Upper Control Arm to Frame:** 68 Nm + 90 degrees * **Rear Lower Control Arm to Knuckle:** 100 Nm + 90 degrees * **Rear Sway Bar End Links:** 56 Nm * **Front Sway Bar End Links:** 56 Nm * **All wheel lug bolts:** 120 Nm

Steering Rack Bolt Torque Specification Update

2008-03-20

This bulletin outlines a change in torque specifications for the steering rack mounting bolts on E90 chassis vehicles. Proper installation can prevent clunking and premature wear.

2005-2011 BMW 3 Series (E90)

Resolution: Ensure the steering rack bolts are tightened to 61 Nm + 90 degrees. Previously, torque specs may have been different.

Front Suspension Bolt Stretch Reminder

2010-09-22

This bulletin serves as a reminder to always replace stretch bolts in the front suspension of E90 models. Reusing these bolts can lead to failure and unsafe operation.

2005-2011 BMW 3 Series (E90)

Resolution: Always replace front suspension stretch bolts when removed. Torque the new bolts to the values specified in technical bulletin 2006-07-15. (81 Nm + 90 degrees for upper and lower control arms and strut to steering knuckle bolts).

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

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.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 BMW Specs. All rights reserved.

Privacy Policy Terms of Service