Audi Audi A7 2010-2018 Suspension Bolt Torque Specifications & Fastener Values
Audi Audi A7 2010-2018

Audi Audi A7 2010-2018 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 2010-2018 Audi A7 (C7) chassis. 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

Front Suspension

Torque specifications for the front suspension components, including control arms, struts, sway bar, and steering components.

1

Upper Control Arm to Frame Bolt (Inner)

M12 x 1.5
Important Notes
Secures the inner end of the upper control arm to the frame. Critical for wheel alignment and stability. Torque to yield bolt, replace upon removal.
2

Upper Control Arm to Steering Knuckle Bolt (Outer)

M12 x 1.5
Important Notes
Connects the upper control arm to the steering knuckle. Essential for steering integrity. Torque to yield bolt, replace upon removal.
3

Lower Control Arm to Frame Bolt (Front Inner)

M14 x 1.5
Important Notes
Secures the front inner part of the lower control arm to the frame. Crucial for load bearing. Torque to yield bolt, replace upon removal.
4

Lower Control Arm to Frame Bolt (Rear Inner)

M14 x 1.5
Important Notes
Secures the rear inner part of the lower control arm to the frame. Crucial for load bearing. Torque to yield bolt, replace upon removal.
5

Lower Control Arm to Steering Knuckle Ball Joint Nut

M12 x 1.25
Important Notes
Secures the ball joint to the steering knuckle. Essential for steering and suspension movement. Torque to yield nut, replace upon removal.
6

Strut Assembly Upper Mount Bolts (to chassis)

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the strut assembly to the chassis. Consistent torque is crucial.
7

Strut Assembly Lower Bolts (to steering knuckle)

M14 x 1.5
Important Notes
Connects the strut to the steering knuckle. Essential for wheel movement. Torque to yield bolt, replace upon removal.
8

Sway Bar End Link to Strut Bolt

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects the sway bar to the strut. Proper torque prevents loosening.
9

Sway Bar Bushing Bracket Bolts (to chassis)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the sway bar bushings to the chassis. Ensure uniform torque to prevent binding.
10

Tie Rod End Nut

M14 x 1.5
Important Notes
Secures the tie rod to the steering knuckle. Critical for precise steering control. Always replace the nut upon removal. Torque to yield nut, replace upon removal.
Page 1 of 2

Rear Suspension

Torque specifications for the rear suspension components, including control arms, springs, shocks, and sway bar.

1

Upper Control Arm to Frame Bolt (Inner)

M12 x 1.5
Important Notes
Secures the inner end of the upper control arm to the frame. Critical for wheel alignment and stability. Torque to yield bolt, replace upon removal.
2

Upper Control Arm to Wheel Carrier Bolt (Outer)

M12 x 1.5
Important Notes
Connects the upper control arm to the wheel carrier. Essential for suspension integrity. Torque to yield bolt, replace upon removal.
3

Lower Control Arm to Frame Bolt (Front Inner)

M14 x 1.5
Important Notes
Secures the front inner part of the lower control arm to the frame. Crucial for load bearing. Torque to yield bolt, replace upon removal.
4

Lower Control Arm to Frame Bolt (Rear Inner)

M14 x 1.5
Important Notes
Secures the rear inner part of the lower control arm to the frame. Crucial for load bearing. Torque to yield bolt, replace upon removal.
5

Lower Control Arm to Wheel Carrier Bolt (Lower Inner)

M14 x 1.5
Important Notes
Secures the lower control arm to the wheel carrier. Essential for stability. Torque to yield bolt, replace upon removal.
6

Toe Link to Frame Bolt

M12 x 1.5
Important Notes
Connects the toe link to the frame. Crucial for wheel alignment. Torque to yield bolt, replace upon removal.
7

Toe Link to Wheel Carrier Bolt

M12 x 1.5
Important Notes
Connects the toe link to the wheel carrier. Maintains alignment settings. Torque to yield bolt, replace upon removal.
8

Rear Spring Upper Control Arm Mounting Bolt

M12 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Secures the upper spring end to the upper control arm. Prevents spring movement.
9

Rear Shock Lower Mounting Bolt

M14 x 1.5
Important Notes
Secures the lower shock end to the wheel carrier. Ensures proper damper function. Torque to yield bolt, replace upon removal.
10

Rear Sway Bar End Link to Wheel Carrier Bolt

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects the sway bar to the wheel carrier. Controls body roll.
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 are correct torque specifications important for suspension bolts?

Correct torque specifications are crucial for maintaining the integrity and performance of your Audi A7's suspension. Under-tightening bolts can lead to loosening, causing excessive play, noise, and ultimately, component failure or even a loss of control. Over-tightening can stretch or break bolts, damage threads, and negatively affect the suspension's intended operation. Using a torque wrench ensures bolts are tightened to the manufacturer's specified level, allowing for safe and reliable handling.

Q2

What happens if I over-torque a suspension bolt?

Over-torquing a suspension bolt can cause several issues. Firstly, the bolt can stretch beyond its yield point, permanently weakening it and making it susceptible to snapping under normal stress. Secondly, the threads in the bolt or the mounting point can be damaged or stripped, requiring costly repairs. Additionally, over-torquing can put undue stress on connected components, leading to premature wear or failure. For example, an over-torqued control arm bolt could warp the arm or damage the bushings it is attached to.

Q3

Can I reuse suspension bolts?

It is generally recommended to replace torque-to-yield (TTY) bolts each time they are removed. These bolts are designed to stretch when tightened, and their clamping force is dependent on that stretch. Reusing TTY bolts can lead to unpredictable clamping force and potential failure. For standard bolts, check their condition. If they show any signs of stretching, damage, or corrosion, they should also be replaced. However, if they appear undamaged and the vehicle has seen minimal use, you may reuse them as long as you properly torque them to spec. The rule of thumb is, when in doubt, replace them.

Q4

Should I apply lubricant to suspension bolts before torquing?

The manufacturer's torque specifications typically assume dry threads. Applying lubricant, such as grease or anti-seize, can alter the friction and lead to over-tightening, even if the torque wrench reads the correct number. Unless specifically stated by Audi in the service manual, apply suspension bolts dry. If lubricant *is* specified, the torque value given by the manufacturer will account for it. Always follow the specific instructions for the vehicle, which can usually be found in the official service manual.

Q5

How often should I inspect the torque on my Audi A7's suspension bolts?

While there's no strict schedule for re-checking torque on all suspension bolts, it's a good practice to do so after major suspension work or after driving on very rough roads. As a general rule, it’s a good idea to check the torque on these bolts after approximately 500 miles of use following any suspension work. You should also check after any significant impacts with potholes or curbs, as the force may have loosened the bolts or damaged suspension components. A periodic visual check for signs of loose hardware is also advised when performing routine maintenance.

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 is essential for accurately tightening suspension bolts to the specified torque. A 1/2 inch drive is suitable for most suspension components.

  • Wide torque range
  • Audible click or digital readout
  • Accurate calibration
Learn more

Torque Wrench (3/8 inch drive)

A smaller 3/8 inch drive torque wrench is useful for some of the smaller suspension bolts and fasteners.

  • Lower torque range
  • Good for tighter spaces
  • Accurate calibration
Learn more

Socket Set (Metric)

A comprehensive metric socket set, including deep sockets, is required to fit all the various bolt head sizes found in the A7 suspension.

  • Wide range of sizes
  • 6-point and 12-point sockets
  • Chrome vanadium steel construction
Learn more

Wrench Set (Metric)

Metric wrenches are sometimes necessary to access bolts that a socket cannot reach, including combination and open end wrenches.

  • Variety of sizes
  • Combination and open-ended options
  • Durable material
Learn more

Extension Bars

Extension bars of various lengths provide added reach when tightening bolts in hard-to-access areas of the suspension.

  • Multiple lengths available
  • Strong and durable construction
  • Secure fit to sockets
Learn more

Ball Joint Separator

A ball joint separator tool is needed to disconnect ball joints for certain suspension work, reducing damage during disassembly.

  • Various types (pickle fork, scissor, etc.)
  • Reduces damage to components
  • Makes separation easier
Learn more
Service Procedures

Front Suspension Strut Replacement

This procedure outlines the necessary steps to remove and replace the front suspension strut, including torque specifications for all relevant bolts.

  • Loosen wheel lug bolts.
  • Raise and support the vehicle safely.
  • Remove the wheel.
  • Disconnect sway bar link, if applicable.
  • Disconnect any brake lines, sensors or other items attached to strut.
  • Remove the lower strut bolts.
  • Remove the upper strut mount nuts or bolts.
  • Remove the old strut.
  • Install new strut, tightening top fasteners to initial torque.
  • Tighten lower strut bolts to specified torque.
  • Tighten top fasteners to final torque.
  • Reattach any disconnected components.
  • Reattach wheels.
  • Lower vehicle.
  • Tighten lug nuts to spec.
View full procedure

Rear Suspension Control Arm Replacement

This procedure outlines the steps to replace rear control arms, including torque specifications for the control arm bolts and other associated hardware.

  • Loosen wheel lug bolts.
  • Raise and support the vehicle safely.
  • Remove the wheel.
  • Locate and remove the control arm bolt at the subframe.
  • Locate and remove the control arm bolt at the hub carrier.
  • Remove old control arm.
  • Install new control arm and tighten all bolts to initial torque.
  • Lower the vehicle to simulate ride height before tightening final torque.
  • Tighten all bolts to final specified torque.
  • Reattach wheel.
  • Lower vehicle.
  • Tighten lug nuts to spec.
View full procedure

Sway Bar Link Replacement

This procedure outlines how to replace the sway bar links and tighten the new parts to the correct specifications.

  • Loosen wheel lug bolts.
  • Raise and support the vehicle safely.
  • Remove the wheel.
  • Locate and remove the upper and lower link mounting nuts.
  • Remove the old sway bar link.
  • Install new link and tighten the nuts to specified torque.
  • Reattach wheels.
  • Lower vehicle.
  • Tighten lug nuts to spec.
View full procedure
Technical Service Bulletins

Suspension Bolt Loosening Issue

2015-06-15

Some 2010-2015 A7 models have experienced issues with suspension bolts loosening after being torqued to specification. This is due to a manufacturing variation in the bolt material.

2010-2015

Resolution: Replace all affected suspension bolts with updated part numbers and ensure proper torque is applied. Use a thread locking compound such as Loctite on all affected fasteners.

Front Strut Squeaking Noise

2017-03-22

A squeaking noise in the front suspension of 2015-2018 A7 models can be caused by dry upper strut mounts. This is more prevalent in colder climates.

2015-2018

Resolution: Inspect the upper strut mount for wear or damage. Apply silicon based lubricant to the upper strut mount bushings, or replace if necessary. Verify all fasteners are torqued to spec.

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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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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