Audi Audi S6 2018-present Suspension Bolt Torque Specifications & Fastener Values
Audi Audi S6 2018-present

Audi Audi S6 2018-present Suspension Bolt Torque Specifications

Comprehensive list of torque specifications for all suspension bolts on the 2018-Present Audi S6 (C8 generation). Includes front and rear suspension components.

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

Front Suspension

Torque specifications for the front suspension components of a 2018-Present Audi S6. This includes control arms, strut assemblies, sway bar links, and related hardware. Correct torque values are critical for safe and proper vehicle handling.

1

Upper Control Arm to Strut Mount Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Secures the upper control arm to the strut mount. Ensure proper seating before tightening. Estimated value based on similar applications.
2

Upper Control Arm to Frame Bolt

M12 x 1.5
Important Notes
Secures the upper control arm to the vehicle frame. Final angle tightening is critical for correct preload. Estimated value based on similar applications.
3

Lower Control Arm to Subframe Bolt (Front)

M14 x 1.5
Important Notes
Connects the front of the lower control arm to the subframe. Use a calibrated torque wrench and angle gauge for accurate tightening. Estimated value based on similar applications.
4

Lower Control Arm to Subframe Bolt (Rear)

M14 x 1.5
Important Notes
Connects the rear of the lower control arm to the subframe. Final angle tightening is crucial for proper preload. Estimated value based on similar applications.
5

Sway Bar End Link to Strut Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Connects the sway bar end link to the strut assembly. Ensure proper alignment before tightening.
6

Sway Bar End Link to Sway Bar Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Connects the sway bar end link to the sway bar. Make sure the end link is properly seated on the sway bar.
7

Strut Assembly Upper Mount to Body Bolt

M10 x 1.5
Important Notes
Secures the strut assembly to the body. Angle torque ensures the correct clamp load. Estimated value based on similar applications.
8

Strut Assembly Lower Mount to Steering Knuckle Bolt

M14 x 1.5
Important Notes
Attaches the lower portion of the strut to the steering knuckle. Angle tightening is critical for preload. Estimated value based on similar applications.
9

Brake Caliper to Steering Knuckle Bolts

M12 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
Holds the brake caliper to the steering knuckle. Use a calibrated torque wrench for accurate tightening.
10

Wheel Speed Sensor Bolt

M6 x 1
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the wheel speed sensor to the knuckle. Avoid over-tightening to prevent sensor damage.
Page 1 of 2

Rear Suspension

Torque specifications for the rear suspension components of a 2018-Present Audi S6, including control arms, shock absorbers, sway bar links, and related hardware. Correct torque values are critical for safe and proper vehicle handling.

1

Upper Control Arm to Body Bolts (Inner)

M12 x 1.5
Important Notes
Secures the inner side of the upper control arm to the vehicle body. Angle torque is important for correct preload. Estimated value based on similar applications.
2

Upper Control Arm to Knuckle Bolt (Outer)

M12 x 1.5
Important Notes
Connects the upper control arm to the rear knuckle. Angle torque ensures proper joint preload. Estimated value based on similar applications.
3

Lower Control Arm to Subframe Bolt (Front)

M14 x 1.5
Important Notes
Secures the front of the lower control arm to the subframe. Angle torque method ensures proper preload. Estimated value based on similar applications.
4

Lower Control Arm to Knuckle Bolt (Rear)

M14 x 1.5
Important Notes
Connects the rear of the lower control arm to the knuckle. Angle tightening is essential. Estimated value based on similar applications.
5

Toe Control Arm to Body Bolt

M12 x 1.5
Important Notes
Connects the toe control arm to the vehicle body. Ensure correct alignment before tightening. Estimated value based on similar applications.
6

Toe Control Arm to Knuckle Bolt

M12 x 1.5
Important Notes
Attaches the toe control arm to the knuckle. Ensure proper alignment. Estimated value based on similar applications.
7

Sway Bar End Link to Body Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Attaches the sway bar end link to the body. Make sure the sway bar end link is properly seated.
8

Sway Bar End Link to Sway Bar Bolt

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Connects the sway bar end link to the sway bar. Ensure the link is correctly oriented before tightening.
9

Rear Shock Absorber Upper Mount to Body Bolt

M10 x 1.5
Important Notes
Secures the upper mount of the rear shock absorber to the body. Angle torque is crucial for proper preload. Estimated value based on similar applications.
10

Rear Shock Absorber Lower Mount to Knuckle Bolt

M14 x 1.5
Important Notes
Connects the lower portion of the shock absorber to the knuckle. Use a calibrated torque wrench and angle gauge for accuracy. Estimated value based on similar applications.
Page 1 of 2

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 is it important to use the correct torque specifications for suspension bolts?

Using the correct torque specifications ensures proper clamping force, preventing bolts from loosening due to vibration or stress. Overtightening can damage bolts and components, while undertightening can lead to suspension failure, loss of control, and increased wear and tear. It's critical for safety and performance.

Q2

What happens if I overtighten a suspension bolt?

Overtightening can stretch or weaken the bolt, potentially leading to thread damage, cracking of the surrounding metal, or bolt failure. It can also damage bushings and other connected components. In a suspension system, this can be very dangerous as it affects structural integrity and handling.

Q3

What happens if I undertighten a suspension bolt?

Undertightened bolts can loosen over time due to vibrations and stress. This can lead to unwanted movement in the suspension components, causing noises, premature wear, alignment issues, and ultimately, potentially catastrophic suspension failure. Consistent checking of torque is crucial after initial tightening.

Q4

Do torque specifications vary for different locations on the Audi S6 suspension?

Yes, absolutely. Torque specifications differ depending on the size, material, and location of the bolt within the suspension system. For example, control arm bolts will have a different torque spec than the strut mount or wheel hub bolts. Always refer to a repair manual for your exact vehicle year and model.

Q5

Do I need to replace suspension bolts every time I remove them?

While not always mandatory, it's often recommended to replace certain suspension bolts, especially those that are torque-to-yield (TTY). These bolts are designed to stretch upon initial tightening, and reuse may compromise their holding capacity. Always consult your vehicle's repair manual.

Q6

Should I use threadlocker on suspension bolts?

Some suspension bolts may require threadlocker to prevent loosening, often those that are difficult to reach for retorquing. However, the application of threadlocker should always be based on the manufacturer's specific recommendations in your vehicle's repair manual. Improper application can cause issues.

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

A precision torque wrench is essential for accurately tightening suspension bolts to the manufacturer's specified torque. Both 1/2" drive and 3/8" drive wrenches may be needed depending on bolt size.

  • Click-type mechanism for precise torque application
  • Calibrated for accuracy
  • Reversible ratcheting head
Learn more

Socket Set

A comprehensive socket set, including standard and metric sizes, is necessary for accessing and torquing various suspension bolts and nuts.

  • Various sizes to fit different bolts and nuts
  • 6-point and 12-point options for different bolt heads
  • Durable construction
Learn more

Torx Socket Set

Torx sockets are often required for specific Audi fasteners, particularly in suspension components.

  • Complete range of Torx sizes
  • Durable construction
  • Proper fit for Torx fasteners
Learn more

Extension Bars

Extension bars of various lengths can help reach recessed or hard-to-access suspension bolts.

  • Various lengths for different applications
  • Durable construction
  • Secure socket attachment
Learn more

Joint/Swivel Adapter

Universal joint or swivel adapters may be required to access bolts at awkward angles.

  • Allows socket to rotate at an angle
  • Durable construction
  • Secure socket attachment
Learn more
Service Procedures

Front Upper Control Arm Bolt Torque Procedure

This procedure outlines the steps to correctly torque the front upper control arm bolts. Improper torque can affect handling and cause premature wear.

  • Raise and properly support the vehicle.
  • Locate the front upper control arm bolts.
  • Using the appropriate socket, hand-tighten all the bolts.
  • Refer to the torque specifications for your specific vehicle.
  • Torque all bolts to the specified torque in the correct sequence.
  • Double-check all torqued bolts.
View full procedure

Front Lower Control Arm Bolt Torque Procedure

This procedure outlines the steps to correctly torque the front lower control arm bolts. Improper torque can affect wheel alignment and cause premature wear.

  • Raise and properly support the vehicle.
  • Locate the front lower control arm bolts.
  • Using the appropriate socket, hand-tighten all the bolts.
  • Refer to the torque specifications for your specific vehicle.
  • Torque all bolts to the specified torque in the correct sequence.
  • Double-check all torqued bolts.
View full procedure

Rear Suspension Control Arm Bolt Torque Procedure

This procedure outlines the steps to correctly torque the rear suspension control arm bolts. Improper torque can affect vehicle stability and tire wear.

  • Raise and properly support the vehicle.
  • Locate the rear suspension control arm bolts.
  • Using the appropriate socket, hand-tighten all the bolts.
  • Refer to the torque specifications for your specific vehicle.
  • Torque all bolts to the specified torque in the correct sequence.
  • Double-check all torqued bolts.
View full procedure

Sway Bar Link Bolt Torque Procedure

This procedure outlines the steps to correctly torque the sway bar link bolts. Improper torque can lead to clunking noises and reduced sway bar effectiveness.

  • Raise and properly support the vehicle.
  • Locate the sway bar link bolts.
  • Using the appropriate socket, hand-tighten all the bolts.
  • Refer to the torque specifications for your specific vehicle.
  • Torque all bolts to the specified torque in the correct sequence.
  • Double-check all torqued bolts.
View full procedure
Technical Service Bulletins

Front Suspension Bolt Retorquing After Service

2020-05-15

This bulletin advises technicians to re-torque all front suspension bolts after any service involving their removal or loosening. This is to ensure correct clamping force and prevent loosening over time.

2018-2020 Audi S6

Resolution: Re-torque all front suspension bolts to factory specifications after any service. A follow-up check is advised after 100 miles.

Rear Suspension Bolt Corrosion Issues

2021-11-20

This bulletin addresses an issue of increased corrosion on rear suspension bolts in areas exposed to road salt. This corrosion can impact proper torque and require bolt replacement.

2018-2021 Audi S6

Resolution: Inspect rear suspension bolts for corrosion. If corrosion is found, replace the affected bolts and torque to factory specifications. Apply anti-seize compound to the bolt threads.

Revised Torque Specifications for Certain Suspension Bolts

2023-01-10

This bulletin updates torque specifications for specific rear suspension control arm bolts to prevent premature bushing wear. Refer to the updated specifications before reassembling suspension.

2020-2023 Audi S6

Resolution: Torque the specified rear control arm bolts to the revised torque specification, which will be provided in the updated service manual. Do not use old torque values.

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.

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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.
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