Audi Audi S4 2016-present Body Panel & Frame Bolt Torque Specifications
Audi Audi S4 2016-present

Audi Audi S4 2016-present Body & Frame Bolt Torque Specifications

Detailed torque specifications for various body bolts on the 2016-Present Audi S4 (B9 generation). Includes torque values in Newton-meters (Nm) and foot-pounds (ft-lbs).

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 End And Bumper

Torque specifications for components of the front end and bumper assembly, including the bumper cover, reinforcement bar, headlights, and grille.

1

Front Bumper Cover Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Secures the plastic bumper cover to the underlying structure. Located along the upper edge and bottom of the bumper cover. Estimated value based on similar components.
2

Front Bumper Reinforcement Bar Bolts

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Fastens the steel bumper reinforcement to the vehicle's frame. Located at the attachment points of the bar to the frame. Estimated value based on similar components.
3

Headlight Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Secures the headlight assembly to the body. Located around the headlight housing perimeter. Estimated value based on similar components.
4

Grille Mounting Bolts/Screws

M5 x 0.8
Torque Value
4.5 ft-lbs (6 N·m)
Important Notes
Secures the grille assembly to the bumper or hood. Usually small fasteners around the grille. Estimated value based on similar components.

Fenders

Torque specifications for mounting the fenders and fender liners to the vehicle body.

1

Fender Mounting Bolts (Upper)

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Secures the fender to the body structure at the upper mounting points. Located along the top edge of the fender, often accessible under the hood. Estimated value based on similar components.
2

Fender Mounting Bolts (Lower)

M6 x 1.0
Torque Value
11 ft-lbs (15 N·m)
Important Notes
Secures the fender to the body at the lower mounting points, often in the wheel well. Located along the bottom edge of the fender. Estimated value based on similar components.
3

Fender Liner Screws/Fasteners

M5 x 0.8
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Secures the plastic fender liner to the fender. Usually numerous small screws or plastic push pins throughout the fender liner. Estimated value based on similar components.

Hood

Torque specifications for mounting the hood and its associated components, including the hinges and latch.

1

Hood Hinge Bolts to Body

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Attaches the hood hinges to the body of the car. Located on the inner fender or cowl where the hinges attach. Estimated value based on similar components.
2

Hood Hinge Bolts to Hood

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Connects the hood to the hinges. Located on the underside of the hood where it attaches to the hinges. Estimated value based on similar components.
3

Hood Latch Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Secures the latch mechanism that holds the hood closed. Located on the radiator support or hood latch bracket. Estimated value based on similar components.

Doors

Torque specifications for door components, including hinges, latch/striker, handles, and interior panels.

1

Door Hinge Bolts to Body

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Attaches the door hinges to the vehicle’s A-pillar and body structure. Located on the A-pillar and door frame. Estimated value based on similar components.
2

Door Hinge Bolts to Door

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Attaches the door to the hinges. Located on the door frame where it attaches to the hinges. Estimated value based on similar components.
3

Door Latch/Striker Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Secures the door latch mechanism to the door and the striker plate on the body. Located on the door jamb and body. Estimated value based on similar components.
4

Door Handle Mounting Bolts/Screws

M5 x 0.8
Torque Value
4.5 ft-lbs (6 N·m)
Important Notes
Secures the door handle to the door panel. Usually small screws behind the handle or interior panel. Estimated value based on similar components.
5

Door Interior Panel Mounting Screws

M4 x 0.7
Torque Value
3.5 ft-lbs (5 N·m)
Important Notes
Holds the interior door panel to the door frame. Located around the interior door panel perimeter. Estimated value based on similar components.

Rear End And Bumper

Torque specifications for components of the rear end and bumper assembly, including the bumper cover, reinforcement bar, taillights and trunk/tailgate components.

1

Rear Bumper Cover Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Secures the plastic bumper cover to the underlying structure. Located along the upper edge and bottom of the bumper cover. Estimated value based on similar components.
2

Rear Bumper Reinforcement Bar Bolts

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Fastens the steel bumper reinforcement to the vehicle's frame. Located at the attachment points of the bar to the frame. Estimated value based on similar components.
3

Tail Light Mounting Bolts/Screws

M5 x 0.8
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Secures the taillight assembly to the body. Located around the taillight housing. Estimated value based on similar components.
4

Trunk/Tailgate Hinge Bolts to Body

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Attaches the trunk/tailgate hinges to the body of the car. Located on the body structure near the trunk/tailgate opening. Estimated value based on similar components.
5

Trunk/Tailgate Hinge Bolts to Trunk/Tailgate

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Connects the trunk/tailgate to the hinges. Located on the underside of the trunk/tailgate where it attaches to the hinges. Estimated value based on similar components.
6

Trunk/Tailgate Latch Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Secures the latch mechanism that holds the trunk/tailgate closed. Located on the trunk/tailgate or body. Estimated value based on similar components.

Body Structure And Panels

Torque specifications for various body panels and structural components.

1

Side Skirt Mounting Bolts/Screws

M5 x 0.8
Torque Value
4.5 ft-lbs (6 N·m)
Important Notes
Secures the side skirts to the body. Located along the undercarriage of the side skirt. Estimated value based on similar components.
2

Roof Panel Mounting Bolts/Screws

M5 x 0.8
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Secures roof paneling to the structure. Often located along the perimeter of the roof and on interior roof sections. Estimated value based on similar components.
3

Body Panel Retaining Fasteners

M4 x 0.7
Torque Value
4.5 ft-lbs (6 N·m)
Important Notes
Smaller fasteners holding various body panels and trim pieces in place. Locations vary depending on the panel. Estimated value based on similar components.

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 body bolts?

Using the correct torque ensures proper clamping force, preventing bolts from loosening due to vibration or stress, and avoiding damage to the body panels and associated components. Over-torquing can deform panels or strip threads, while under-torquing can lead to rattles, misalignment, or component failure.

Q2

What happens if I over-torque a body bolt?

Over-torquing can stretch or weaken the bolt, potentially leading to future failure. It can also damage the threaded insert or the panel itself, resulting in stripped threads or deformation. In some cases, this can necessitate more significant repairs like panel replacement.

Q3

What happens if I under-torque a body bolt?

Under-torqued bolts won't provide sufficient clamping force, which can lead to rattles, squeaks, and panel misalignment. In severe cases, it can lead to loosening and potentially loss of a panel or component, especially in areas subject to vibration. For example, under-torqued fender bolts can cause the fender to vibrate at high speeds.

Q4

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

While not always mandatory, it's generally recommended to replace self-locking or torque-to-yield body bolts, as they may not maintain their clamping force after being loosened. It's also wise to replace any bolts that show signs of corrosion or damage. For standard bolts, visually inspect them for damage before reuse.

Q5

Can I use a standard socket instead of a torque wrench when tightening body bolts?

No, it is not recommended. A standard socket wrench does not accurately measure torque. Using a torque wrench is critical for ensuring the bolt is tightened to the specific manufacturer's torque specification and is vital to the longevity of the vehicle and the safety of yourself and others. If a torque wrench is unavailable, a visit to a certified mechanic should be made to ensure proper bolt torque.

Q6

Are there any specific tools I should use to maintain body bolts on my S4?

Yes, a quality torque wrench is essential. It's also advisable to use the correct size sockets, ideally impact sockets if using an impact driver, and optionally an extension or u-joint for hard to reach bolts. It's advisable to have a thread cleaning tool and anti-seize for body bolts and components that may see the elements.

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 is essential for accurate bolt tightening.

  • Click-type mechanism for precise torque application
  • Wide torque range suitable for body bolts
  • 1/2" drive for common socket sizes
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench is useful for lower torque fasteners.

  • Click-type mechanism for precise torque application
  • Suitable for smaller body hardware
  • 3/8" drive for smaller socket sizes
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various body bolts.

  • Variety of sizes to accommodate different bolt heads
  • Durable construction for reliable torque application
  • 6-point sockets for a secure grip on fasteners
Learn more

Extension Bars

Extension bars to access recessed or hard-to-reach body bolts.

  • Allows for access to deep bolt locations
  • Available in various lengths
  • Durable construction
Learn more

Universal Joint

A universal joint is helpful when the socket must operate at an angle.

  • Allows for angled socket attachment
  • Improves access to tight spaces
  • Robust for torque application
Learn more
Service Procedures

Front Bumper Cover Removal and Installation

Procedure for safely removing and reinstalling the front bumper cover, including torque specs for relevant bolts.

  • Disconnect any electrical connectors to the bumper
  • Remove all fasteners securing the bumper
  • Carefully detach the bumper cover from the vehicle
  • Reinstall bumper cover and secure with all fasteners
  • Tighten all fasteners to the specified torque
View full procedure

Rear Bumper Cover Removal and Installation

Procedure for safely removing and reinstalling the rear bumper cover, including torque specs for relevant bolts.

  • Disconnect any electrical connectors to the bumper
  • Remove all fasteners securing the bumper
  • Carefully detach the bumper cover from the vehicle
  • Reinstall bumper cover and secure with all fasteners
  • Tighten all fasteners to the specified torque
View full procedure

Fender Removal and Installation

Procedure for safely removing and reinstalling a front fender, including torque specs for relevant bolts.

  • Remove wheel and wheel liner
  • Remove fasteners securing the fender to the body
  • Carefully detach the fender from the vehicle
  • Reinstall fender and secure with all fasteners
  • Tighten all fasteners to the specified torque
View full procedure

Hood Removal and Installation

Procedure for safely removing and reinstalling the hood, including torque specs for relevant bolts.

  • Mark the hood's current position prior to removal
  • Disconnect any relevant electrical connectors
  • Remove fasteners securing the hood to the hinges
  • Carefully detach the hood from the vehicle
  • Reinstall hood and secure with all fasteners
  • Realign hood to original position
  • Tighten all fasteners to the specified torque
View full procedure
Technical Service Bulletins

Corrosion Issues on Body Fasteners

2019-07-15

Technical bulletin regarding corrosion affecting body bolts, particularly in areas exposed to road salt. This can affect torque application and require replacement of fasteners.

2016-2019 Audi S4

Resolution: Inspect body fasteners for corrosion. Replace any corroded fasteners with new, appropriately coated bolts. Apply anti-seize compound to the threads of fasteners during installation. Adhere to specified torque values to prevent fastener failure.

Loose Bumper Cover Fasteners

2020-03-01

Technical bulletin addressing reports of loose bumper cover fasteners, primarily due to vibration. This can lead to damage and improper alignment.

2016-2020 Audi S4

Resolution: Inspect all bumper cover fasteners for proper torque. If fasteners are found to be loose, replace them with new bolts and apply threadlocker. Re-torque fasteners to the specified values.

Fender Alignment Issues After Body Work

2022-11-10

Technical bulletin regarding proper fender alignment after repairs. Incorrect torque values on body bolts can lead to misalignment and inconsistent panel gaps.

2016-2022 Audi S4

Resolution: Ensure all fasteners connecting the fender to the vehicle are tightened to the correct torque specifications. Check fender alignment and adjust as necessary, paying close attention to panel gap consistency. Always use calibrated torque wrenches.

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
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