Audi Audi S6 2012-2018 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi S6 2012-2018

Audi Audi S6 2012-2018 Suspension Bolt Torque Specifications

Comprehensive list of torque specifications for suspension bolts on the 2012-2018 Audi S6 (C7) platform. 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

This section covers the torque specifications for the various components of the front suspension system, including control arms, steering knuckle, sway bar, and strut assembly. These components are critical for vehicle handling, stability, and ride quality.

1

Upper Control Arm to Chassis Bolts

M12 x 1.5
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Estimated value based on similar Audi models and standard torque values for this bolt size.
2

Upper Control Arm to Steering Knuckle Bolt (Ball Joint Pinch Bolt)

M10 x 1.25
Important Notes
This is an angle-tightening procedure, requiring an initial torque value, followed by a specified degree of rotation.
3

Lower Control Arm to Chassis Bolts

M14 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Estimated value based on similar Audi models and standard torque values for this bolt size.
4

Lower Control Arm to Steering Knuckle Bolt

M12 x 1.5
Important Notes
This is an angle-tightening procedure, requiring an initial torque value, followed by a specified degree of rotation.
5

Sway Bar Link to Stabilizer Bar Bolt

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure the sway bar link is properly aligned before tightening.
6

Sway Bar Link to Strut Assembly Bolt

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure the sway bar link is properly aligned before tightening.
7

Strut Assembly to Steering Knuckle Bolts

M14 x 1.5
Important Notes
This is an angle-tightening procedure, requiring an initial torque value, followed by a specified degree of rotation.
8

Strut Mount to Body Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten the bolts evenly to avoid stressing the strut mount.
9

Brake Caliper to Steering Knuckle Bolts

M14 x 1.5
Torque Value
148 ft-lbs (200 N·m)
Important Notes
Ensure proper alignment of the brake caliper before tightening. These are critical safety fasteners.

Rear Suspension

This section contains the torque specifications for the rear suspension system, including control arms, wheel carrier, sway bar, and shock absorbers. These components are essential for handling, stability, and ride comfort of the vehicle.

1

Upper Control Arm to Chassis Bolts

M12 x 1.5
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Estimated value based on similar Audi models and standard torque values for this bolt size.
2

Upper Control Arm to Wheel Carrier Bolt (Ball Joint Pinch Bolt)

M10 x 1.25
Important Notes
This is an angle-tightening procedure, requiring an initial torque value, followed by a specified degree of rotation.
3

Lower Control Arm to Chassis Bolts

M14 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Estimated value based on similar Audi models and standard torque values for this bolt size.
4

Lower Control Arm to Wheel Carrier Bolt

M12 x 1.5
Important Notes
This is an angle-tightening procedure, requiring an initial torque value, followed by a specified degree of rotation.
5

Toe Control Arm to Chassis Bolt

M12 x 1.5
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Estimated value based on similar Audi models and standard torque values for this bolt size.
6

Toe Control Arm to Wheel Carrier Bolt

M12 x 1.5
Torque Value
66 ft-lbs (90 N·m)
Important Notes
Ensure proper alignment of the toe control arm before tightening.
7

Sway Bar Link to Stabilizer Bar Bolt

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure the sway bar link is properly aligned before tightening.
8

Sway Bar Link to Lower Control Arm Bolt

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Ensure the sway bar link is properly aligned before tightening.
9

Shock Absorber Lower Bolt

M12 x 1.5
Important Notes
This is an angle-tightening procedure, requiring an initial torque value, followed by a specified degree of rotation.
10

Shock Absorber Upper Mount to Body Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten the bolts evenly to avoid stressing the shock mount.
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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 is crucial for the safe and proper function of your Audi S6's suspension. Under-torquing can lead to bolts loosening, causing instability and potentially dangerous situations. Over-torquing can stretch or break bolts, damage components, and make future disassembly difficult. It ensures the clamping force is within the designed range for secure and reliable performance, and proper component alignment for correct geometry.

Q2

What happens if I don't use a torque wrench?

Attempting to tighten suspension bolts without a torque wrench is risky. You’ll likely either under or over-tighten them. While it might seem 'tight enough' by hand, this is not accurate and can compromise safety and vehicle handling. Consistent, even torque across all bolts is impossible without a calibrated torque wrench.

Q3

Should I use new bolts when working on the suspension?

It is highly recommended to replace torque-to-yield (TTY) bolts, often found in critical suspension locations, whenever they are loosened. These bolts are designed to stretch upon tightening and should not be reused as their clamping force will be reduced. Check your vehicle's service manual to determine which bolts are TTY. Also consider replacing self-locking nuts for optimal performance.

Q4

What is the proper procedure for tightening suspension bolts?

Generally, you should first tighten bolts in a specific pattern (usually a criss-cross pattern) to a preliminary torque. Then, you follow this with the final, specified torque value, tightening progressively to ensure even pressure and correct load distribution. Some bolts may require an additional angle-tightening step after the initial torque. Always refer to the vehicle service manual for the specific procedure.

Q5

How often should I check the torque on my suspension bolts?

It's a good practice to re-check the torque on your suspension bolts after about 50-100 miles of driving after any work has been performed on the suspension. After that, a visual inspection every 6 months or 6000 miles or whenever you hear a clunking noise while turning can help identify potential problems before they escalate.

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 for accurately tightening suspension bolts to the specified values.

  • Measures torque in ft-lbs or Nm
  • Click-type or digital display
  • Range suitable for suspension components (e.g., 20-150 ft-lbs)
Learn more

Socket Set (1/2" Drive, Metric)

A comprehensive set of metric sockets to fit the various suspension fasteners.

  • Includes common sizes: 13mm, 16mm, 18mm, 21mm, etc.
  • 6-point sockets recommended for a secure fit
  • Deep sockets may be required
Learn more

Socket Extension (1/2" Drive)

Extensions to reach recessed bolts on the suspension.

  • Various lengths available (e.g., 3", 6", 10")
  • Provides clearance for obstacles
  • Solid construction
Learn more

Universal Joint (1/2" Drive)

A universal joint can help access fasteners at an angle.

  • Swivels to provide flexibility
  • Sturdy construction
  • Reduces strain on tools and fasteners
Learn more
Service Procedures

Front Lower Control Arm Bolt Torque Procedure

Procedure for torquing the lower control arm bolts on the front suspension of the 2012-2018 Audi S6.

  • Locate the lower control arm bolts.
  • Loosely install the new bolt, do not tighten fully.
  • Lower the vehicle onto its wheels to ride height.
  • Torque the bolts to the specified torque value.
  • Mark the bolts after the procedure
View full procedure

Front Upper Control Arm Bolt Torque Procedure

Procedure for torquing the upper control arm bolts on the front suspension of the 2012-2018 Audi S6.

  • Locate the upper control arm bolts.
  • Loosely install the new bolts, do not tighten fully.
  • Lower the vehicle onto its wheels to ride height.
  • Torque the bolts to the specified torque value.
  • Mark the bolts after the procedure
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

Procedure for torquing the lower control arm bolts on the rear suspension of the 2012-2018 Audi S6.

  • Locate the lower control arm bolts.
  • Loosely install the new bolts, do not tighten fully.
  • Lower the vehicle onto its wheels to ride height.
  • Torque the bolts to the specified torque value.
  • Mark the bolts after the procedure
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

Procedure for torquing the upper control arm bolts on the rear suspension of the 2012-2018 Audi S6.

  • Locate the upper control arm bolts.
  • Loosely install the new bolts, do not tighten fully.
  • Lower the vehicle onto its wheels to ride height.
  • Torque the bolts to the specified torque value.
  • Mark the bolts after the procedure
View full procedure

Rear Toe Link Bolt Torque Procedure

Procedure for torquing the toe link bolts on the rear suspension of the 2012-2018 Audi S6.

  • Locate the toe link bolts.
  • Loosely install the new bolts, do not tighten fully.
  • Lower the vehicle onto its wheels to ride height.
  • Torque the bolts to the specified torque value.
  • Mark the bolts after the procedure
View full procedure
Technical Service Bulletins

Suspension Noise After Control Arm Replacement

2016-07-15

Some 2012-2018 S6 models may experience suspension noise after control arm replacement due to improper torque procedures. This bulletin outlines the correct procedures and torque specifications for all control arm bolts.

2012-2018

Resolution: Ensure all suspension bolts are tightened under load (vehicle on the ground at ride height) and to the specified torque value. Refer to the workshop manual for torque specifications. Mark bolts after completion.

Revised Torque Specification for Rear Toe Link

2018-03-22

This bulletin announces a revised torque specification for the rear toe link bolts on the 2012-2018 S6. Using the previously published torque value may result in premature wear or failure.

2012-2018

Resolution: Use the revised torque specifications for the rear toe link bolts as specified in the latest service manual.

About the Author

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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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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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