Audi Audi S5 2017-present Suspension Bolt Torque Specifications & Fastener Values
Audi Audi S5 2017-present

Audi Audi S5 2017-present Suspension Bolt Torque Specifications

Comprehensive guide to torque specifications for various suspension bolts on the 2017-Present Audi S5 (B9/B9.5 platform). Includes detailed torque values for 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

Components and fasteners related to the front suspension system of the vehicle. Includes control arms, struts, sway bar links, and brake components.

1

Upper Control Arm to Chassis Bolts

M12 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
These bolts secure the upper control arm to the vehicle's frame. Critical for maintaining wheel alignment. Derived from similar Audi A4/A5, B9 platform specs. Always use a calibrated torque wrench.
2

Upper Control Arm to Steering Knuckle Bolt

M12 x 1.5
Important Notes
Attaches the upper control arm to the steering knuckle. Derived from similar Audi A4/A5, B9 platform specs. Angle torque is critical for proper clamping force. Always use a calibrated torque wrench.
3

Lower Control Arm to Chassis Bolts

M14 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Secures the lower control arm to the chassis. Derived from similar Audi A4/A5, B9 platform specs. Proper torque is vital for suspension stability. Always use a calibrated torque wrench.
4

Lower Control Arm to Steering Knuckle Bolt

M14 x 1.5
Important Notes
Connects the lower control arm to the steering knuckle. Derived from similar Audi A4/A5, B9 platform specs. Angle torque is critical for proper clamping force. Always use a calibrated torque wrench.
5

Sway Bar Link to Strut Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the sway bar link to the strut assembly. Estimated value based on typical M10 bolt applications. Always use a calibrated torque wrench.
6

Sway Bar Link to Sway Bar Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the sway bar link to the sway bar. Estimated value based on typical M10 bolt applications. Always use a calibrated torque wrench.
7

Strut to Steering Knuckle Bolts

M14 x 1.5
Important Notes
Secures the strut to the steering knuckle. Derived from similar Audi A4/A5, B9 platform specs. Always replace these bolts upon removal. Angle torque is critical for proper clamping force. Always use a calibrated torque wrench.
8

Strut Tower Top Mounting Nuts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
These nuts secure the top of the shock assembly to the chassis. Derived from similar Audi A4/A5, B9 platform specs. Always use a calibrated torque wrench.
9

Brake Caliper Bolts

M14 x 1.5
Torque Value
155 ft-lbs (210 N·m)
Important Notes
Safety-critical fasteners that ensure proper clamping force of the brake caliper. Derived from similar Audi A4/A5, B9 platform specs. Always use a calibrated torque wrench.

Rear Suspension

Components and fasteners related to the rear suspension system of the vehicle. Includes control arms, shocks, sway bar links, and brake components.

1

Upper Control Arm to Chassis Bolts

M12 x 1.5
Torque Value
59 ft-lbs (80 N·m)
Important Notes
Secures the upper control arm to the rear frame. Derived from similar Audi A4/A5, B9 platform specs. Always use a calibrated torque wrench.
2

Upper Control Arm to Rear Upright Bolt

M12 x 1.5
Important Notes
Attaches the upper control arm to the rear upright. Derived from similar Audi A4/A5, B9 platform specs. Angle torque is critical for proper clamping force. Always use a calibrated torque wrench.
3

Lower Control Arm to Chassis Bolts

M14 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
Secures the lower control arm to the chassis. Derived from similar Audi A4/A5, B9 platform specs. Always use a calibrated torque wrench.
4

Lower Control Arm to Rear Upright Bolt

M14 x 1.5
Important Notes
Connects the lower control arm to the rear upright. Derived from similar Audi A4/A5, B9 platform specs. Angle torque is critical for proper clamping force. Always use a calibrated torque wrench.
5

Sway Bar Link to Rear Upright Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Attaches the sway bar link to the rear upright. Estimated value based on typical M10 bolt applications. Always use a calibrated torque wrench.
6

Sway Bar Link to Sway Bar Bolt

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Connects the sway bar link to the sway bar. Estimated value based on typical M10 bolt applications. Always use a calibrated torque wrench.
7

Shock Absorber Lower Mounting Bolt

M12 x 1.5
Important Notes
Connects the shock absorber to the suspension upright. Derived from similar Audi A4/A5, B9 platform specs. Angle torque is critical for proper clamping force. Always use a calibrated torque wrench.
8

Shock Absorber Upper Mounting Nuts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secures the top of the shock assembly to the chassis. Derived from similar Audi A4/A5, B9 platform specs. Always use a calibrated torque wrench.
9

Rear Brake Caliper Bolts

M12 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Safety-critical fasteners that ensure proper clamping force of the rear brake caliper. Derived from similar Audi A4/A5, B9 platform specs. Always use a calibrated torque wrench.

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 torque specifications important for suspension bolts?

Correct torque is critical for suspension safety and performance. Under-tightening can lead to bolts loosening, causing component failure and loss of control. Over-tightening can stretch or break bolts, damage threads, or deform components, resulting in similar dangerous outcomes. Proper torque ensures the joint is clamped correctly and the suspension operates as intended.

Q2

Where can I find the correct torque specifications for my specific 2017-Present Audi S5?

The most reliable source is the official Audi repair manual for your specific model year and chassis code (e.g., B9, B9.5). These manuals provide detailed diagrams and torque specs. While general guides and online forums can be helpful, always cross-reference with the official manual. Torque specifications can vary slightly between model years and variants.

Q3

What type of torque wrench should I use for suspension work?

A high-quality, calibrated torque wrench is essential. Use a click-type torque wrench for accuracy. Avoid using beam-style wrenches as they can be less precise. For lower torque specs, a smaller inch-pound wrench may be required. Ensure your wrench's calibration is current; regular calibration is recommended for accuracy.

Q4

Should I use new bolts when working on my suspension?

For many critical suspension components, using new bolts is strongly recommended, and in some cases, required by Audi. Torque-to-yield bolts are designed for one-time use and must be replaced. These bolts stretch during tightening and cannot be reliably reused. Always consult your repair manual to see what Audi specifies for your car's components.

Q5

What is the difference between Nm (Newton-meters) and lb-ft (pound-feet)?

Nm (Newton-meters) and lb-ft (pound-feet) are both units of torque. Nm is the standard metric unit, while lb-ft is commonly used in the US. To convert between the two, multiply lb-ft by 1.356 to get Nm, or divide Nm by 1.356 to get lb-ft. Double-check that your torque wrench is set to the correct units before tightening any bolts.

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 inch drive)

A calibrated torque wrench capable of measuring in Newton-meters (Nm) and foot-pounds (ft-lbs).

  • Accurate torque application
  • Click-type or digital readout
  • Wide torque range
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench, typically used for lower torque applications.

  • Ideal for smaller bolts
  • Fine adjustment
  • Precise torque settings
Learn more

Socket Set (Metric)

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

  • Impact rated sockets are recommended
  • Deep and shallow sockets
  • 12-point sockets for optimal grip
Learn more

Extension Bars

Used to reach fasteners in recessed areas and provide additional leverage.

  • Various lengths for access
  • Sturdy construction
  • Secure socket attachment
Learn more

Universal Joint

Allows the socket to be used at an angle when a straight approach is not possible.

  • Flexible movement
  • Durable construction
  • Secure socket connection
Learn more

Jack and Jack Stands

Used to safely raise and support the vehicle.

  • Rated capacity for the vehicle
  • Stable base
  • Secure locking mechanisms
Learn more

Wheel Chocks

Used to prevent the vehicle from rolling while it is raised.

  • Durable material
  • Proper size for tires
  • Secure placement
Learn more
Service Procedures

Front Suspension Control Arm Bolt Torque Procedure

This procedure outlines the steps to properly torque the front control arm bolts on a 2017-Present Audi S5.

  • Raise the vehicle using a jack and secure it on jack stands. Remove the front wheels.
  • Locate the control arm bolts connecting the control arm to the subframe and spindle.
  • Using the appropriate socket, extension, and torque wrench, tighten the bolts to the manufacturer specified torque. Refer to the technical documentation for exact values.
  • Confirm torque values. Lower the vehicle and confirm proper wheel alignment.
View full procedure

Rear Suspension Control Arm Bolt Torque Procedure

This procedure outlines the steps to properly torque the rear control arm bolts on a 2017-Present Audi S5.

  • Raise the vehicle using a jack and secure it on jack stands. Remove the rear wheels.
  • Locate the control arm bolts connecting the control arm to the subframe and spindle.
  • Using the appropriate socket, extension, and torque wrench, tighten the bolts to the manufacturer specified torque. Refer to the technical documentation for exact values.
  • Confirm torque values. Lower the vehicle and confirm proper wheel alignment.
View full procedure

Strut/Shock Mounting Bolt Torque Procedure

This procedure outlines the steps to properly torque the strut/shock mounting bolts on a 2017-Present Audi S5.

  • Raise the vehicle using a jack and secure it on jack stands. Remove the corresponding wheels.
  • Locate the bolts securing the strut/shock to the chassis and spindle/hub.
  • Using the appropriate socket, extension, and torque wrench, tighten the bolts to the manufacturer specified torque. Refer to the technical documentation for exact values.
  • Confirm torque values. Lower the vehicle and confirm proper wheel alignment.
View full procedure
Technical Service Bulletins

Suspension Bolt Re-torque Recommendation

2018-05-10

A technical bulletin regarding the importance of re-torquing suspension bolts after initial installation or service.

2017-2018 Audi S5

Resolution: Re-torque all suspension bolts to the specified torque values after 500 miles of driving following any suspension work or parts replacement.

Front Lower Control Arm Bolt Issue

2020-02-15

A bulletin addressing a reported issue with loosening front lower control arm bolts.

2017-2020 Audi S5

Resolution: Inspect and replace the affected bolts. Apply thread locker prior to re-torquing to the specified values.

Rear Subframe Bolt Torque Specification Update

2022-09-28

An update to the recommended torque values for the rear subframe bolts.

2017-2022 Audi S5

Resolution: Use the updated torque specification found in the official Audi service documentation when working on the rear subframe. Verify proper alignment upon reassembly.

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 Audi Specs. All rights reserved.

Privacy Policy Terms of Service