Audi Audi S3 2013-present Suspension Bolt Torque Specifications & Fastener Values
Audi Audi S3 2013-present

Audi Audi S3 2013-present Suspension Bolt Torque Specifications

Comprehensive guide to suspension bolt torque specifications for the 8V, 8Y and current generation Audi S3, ensuring proper installation and safety.

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 2013-Present Audi S3. Includes struts, control arms, anti-roll bar, and related hardware. These components are critical for vehicle handling, stability, and safety.

1

Front Strut Pinch Bolt

M14 x 1.5
Important Notes
Secures the strut to the steering knuckle. Critical for maintaining proper wheel alignment and suspension geometry. Failure can cause loss of control.
2

Front Strut Top Mount Bolts (to Body)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the top of the strut assembly to the vehicle's body. Important for stability and proper load transfer.
3

Front Lower Control Arm Ball Joint Nut (to Knuckle)

M12 x 1.5
Important Notes
Connects the lower control arm to the steering knuckle, allowing for wheel movement. Critical for steering and suspension.
4

Front Lower Control Arm Bolts (to Subframe)

M12 x 1.5
Important Notes
Secures the lower control arm to the subframe, a key part of the suspension system.
5

Front Anti-Roll Bar Drop Link Nuts (to Strut)

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Connects the anti-roll bar to the strut, important for stability.
6

Front Anti-Roll Bar Drop Link Nuts (to Anti-Roll Bar)

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Connects the anti-roll bar to the drop link, critical for sway control.
7

Front Anti-Roll Bar Bracket Bolts (to Subframe)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the anti-roll bar brackets to the subframe, an important part of the suspension geometry. Value estimated based on similar size bolts.
8

Front Wheel Speed Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the ABS sensor, allowing proper monitoring of wheel speed. Value estimated based on similar size bolts.
9

Tie Rod End Nut (to Knuckle)

M14 x 1.5
Important Notes
Connects the steering tie rod to the steering knuckle, a critical steering component.

Rear Suspension

Torque specifications for the rear suspension components of a 2013-Present Audi S3. Includes struts, control arms, anti-roll bar, and related hardware. These components are critical for vehicle handling, stability, and safety.

1

Rear Strut Pinch Bolt

M14 x 1.5
Important Notes
Secures the rear strut to the knuckle/carrier, essential for suspension stability.
2

Rear Strut Top Mount Bolts (to Body)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the top of the rear strut assembly to the chassis.
3

Rear Lower Control Arm Inner Bolt (to Subframe)

M12 x 1.5
Important Notes
Attaches the control arm to the subframe, a fundamental component of the rear suspension.
4

Rear Lower Control Arm Outer Bolt (to Wheel Carrier)

M12 x 1.5
Important Notes
Connects the lower control arm to the wheel carrier, essential for wheel alignment and control.
5

Rear Upper Control Arm Inner Bolt (to Body)

M12 x 1.5
Important Notes
Secures the upper control arm to the vehicle body.
6

Rear Upper Control Arm Outer Bolt (to Wheel Carrier)

M12 x 1.5
Important Notes
Connects the upper control arm to the wheel carrier, essential for stability and handling.
7

Rear Anti-Roll Bar Drop Link Nuts (to Strut or Carrier)

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Connects the anti-roll bar to the rear suspension.
8

Rear Anti-Roll Bar Drop Link Nuts (to Anti-Roll Bar)

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Connects the anti-roll bar to the drop link, critical for controlling body roll.
9

Rear Anti-Roll Bar Bracket Bolts (to Chassis)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the anti-roll bar brackets to the body, crucial for anti-roll bar function. Value estimated based on similar size bolts.
10

Rear Wheel Speed Sensor Bolt

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the ABS sensor to the wheel carrier. Value estimated based on similar size bolts.

Subframe

Torque specifications for subframe mounting bolts on a 2013-Present Audi S3. Subframe bolts are critical for overall vehicle structural integrity and suspension performance. These bolts are torque-to-yield (TTY) and must be replaced when removed.

1

Front Subframe Bolts (to Body)

M14 x 2.0
Important Notes
Critical for securing the entire front suspension to the vehicle. Use new bolts. Torque-to-yield bolt.
2

Rear Subframe Bolts (to Body)

M14 x 2.0
Important Notes
Secures the rear suspension components, crucial for overall stability. Use new bolts. Torque-to-yield bolt.

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 crucial for maintaining suspension integrity, preventing loosening due to vibration, and ensuring proper component function. Under-torquing can lead to parts coming loose, causing instability and potential failure. Over-torquing can damage threads, stretch bolts, and weaken components, potentially resulting in future failure. Following specified torque values ensures that clamping force is within the designed range for optimal performance and safety.

Q2

What happens if I overtighten a suspension bolt?

Overtightening can lead to a variety of issues, including: bolt stretching and weakening, thread damage in the bolt or the receiving component, deformation of the suspension part being fastened, and stress fractures in the components. These can lead to immediate problems, or a failure later down the line potentially causing a loss of control while driving.

Q3

What happens if I undertighten a suspension bolt?

Undertightening a bolt can cause parts to move or shift which will result in premature wear, potential damage, noises, and instability. In severe cases, this can result in a separation of a suspension component and a loss of vehicle control. Examples include; loose control arm bolts causing play in the suspension or loose caliper bolts causing brake problems.

Q4

Should I use thread locker on suspension bolts?

In most cases, no. Unless specified in the service manual, thread locker should not be used. Suspension bolts are usually designed with locking features like prevailing torque or stretch bolts. Incorrect thread locker use can result in inaccurate torque readings or bolt failure. Refer to the official service manual for your specific vehicle.

Q5

Can I reuse suspension bolts?

Some suspension bolts, particularly those that are torque-to-yield (TTY) or stretch bolts, are designed for one-time use only. These bolts permanently deform when tightened to the specified torque, and reusing them may lead to compromised clamping force and potential failure. Always refer to the service manual for your specific model to determine which bolts must be replaced when removed.

Q6

What kind of tools do I need for torquing suspension bolts?

You will need a properly calibrated torque wrench that can accurately measure the specified torque values. Ensure the wrench is within its calibration period. A socket set that fits the various bolt heads will also be required. Some bolts may need special tools, for example, triple square bits. Consult your service manual before you begin.

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 calibrated torque wrench is essential for accurately tightening suspension bolts to the manufacturer's specified torque.

  • Click-type or digital readout
  • Appropriate torque range for suspension components (e.g., 20-150 Nm)
Learn more

Socket Set

A comprehensive socket set, including various metric sizes, is required for accessing and tightening different suspension bolts and nuts.

  • Variety of sizes (e.g., 10mm - 24mm)
  • 6-point sockets recommended
  • Deep sockets for recessed bolts
Learn more

Wrench Set

A set of combination wrenches is useful for holding nuts while tightening bolts.

  • Variety of sizes (e.g., 10mm - 24mm)
  • Open-end and box-end design
Learn more

Allen Key/Hex Bit Set

Some suspension components may use Allen bolts, making a set of Allen keys or hex bits necessary.

  • Metric sizes
  • Ball-end versions for angled access
Learn more

Vehicle Jack and Jack Stands

A reliable jack and jack stands are crucial for safely lifting and supporting the vehicle during suspension work.

  • Sufficient lifting capacity
  • Sturdy construction
  • Adjustable height jack stands
Learn more
Service Procedures

Front Strut Assembly Torque Procedure

Detailed procedure for torquing the bolts related to the front strut assembly on a 2013-Present Audi S3.

  • Loosen wheel bolts and lift the vehicle with a jack and support with jack stands.
  • Remove the wheel.
  • Locate the upper strut mount bolts (usually 3 or 4). Tighten to the specified torque of 25 Nm + 90 degree.
  • Locate the lower strut pinch bolt and tighten to the specified torque of 70 Nm + 90 degree.
  • Locate the sway bar end link bolts at the strut and tighten to 40 Nm + 90 degree.
  • Reinstall the wheel and lower the vehicle.
  • Tighten wheel bolts to the specified torque (typically 120 Nm)
View full procedure

Rear Suspension Control Arm Torque Procedure

Detailed procedure for torquing the bolts on the rear control arms of a 2013-Present Audi S3.

  • Loosen wheel bolts and lift the vehicle with a jack and support with jack stands.
  • Remove the wheel.
  • Locate the inner control arm bolts (typically 2-3 per arm) and tighten all bolts to 70 Nm + 90 degree.
  • Locate the outer control arm bolt which is usually shared with the rear upright and tighten to 70 Nm + 90 degree.
  • Locate the sway bar end link bolts at the control arm and tighten to 40 Nm + 90 degree.
  • Reinstall the wheel and lower the vehicle.
  • Tighten wheel bolts to the specified torque (typically 120 Nm)
View full procedure

Rear Shock Absorber Torque Procedure

Detailed procedure for torquing the bolts related to the rear shock absorber on a 2013-Present Audi S3.

  • Loosen wheel bolts and lift the vehicle with a jack and support with jack stands.
  • Remove the wheel.
  • Locate the lower shock absorber bolt and tighten to 70 Nm + 90 degree.
  • Locate the upper shock absorber mount bolts (typically 2) and tighten to 25 Nm + 90 degree.
  • Reinstall the wheel and lower the vehicle.
  • Tighten wheel bolts to the specified torque (typically 120 Nm)
View full procedure
Technical Service Bulletins

Suspension Noise at Low Speeds

2018-05-15

Some 2013-2017 Audi S3 models may experience a clicking or popping noise from the front suspension at low speeds. This can be due to improper torque on the subframe bolts, allowing for minor shifting.

2013-2017

Resolution: Inspect subframe bolts for correct torque specification, and re-torque to 70 Nm + 90 degree, and/or replace any damaged components. Check control arm bolts for correct torque of 70 Nm + 90 degree

Rear Suspension Alignment Drift

2020-11-20

A small percentage of 2017-2020 Audi S3 vehicles have reported rear suspension alignment drifting out of spec, due to issues in the subframe and associated bolts. This can cause uneven tire wear.

2017-2020

Resolution: Inspect subframe and control arm bolts for proper torque per factory specification. Re-torque all subframe bolts to 70 Nm + 90 degree. If the issue persists, replace subframe bolts and bushings. Check all control arm bolts to 70 Nm + 90 degree.

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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