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

Audi Audi S5 2017-present Drivetrain Bolt Torque Specifications

Detailed list of torque specifications for various drivetrain bolts on the 2017-present Audi S5. Includes specifications for transmission, differential, and driveshaft 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

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Torque Calculator

Convert between different torque units

Transmission

This section covers torque specifications for the transmission, including mounting, pan, and drain/fill plugs. These components are critical for the proper functioning and fluid integrity of the transmission system.

1

Transmission Bellhousing Bolts

M12 x 1.5
Torque Value
40 ft-lbs (55 N·m)
Important Notes
Secures the transmission to the engine block. Estimated based on similar applications.
2

Transmission Mount Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Secures the transmission to the chassis. Estimated value.
3

Transmission Pan Bolts (Automatic)

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Secures the transmission pan. Estimated value. Use a cross tightening sequence. Overtightening can cause leaks.
4

Transmission Fill Plug

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Seals the fill hole. Estimated value.
5

Transmission Drain Plug

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Seals the drain hole. Estimated value.
6

Mechatronic Unit Bolts (Automatic)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the mechatronic unit to the transmission body. Estimated value. Use a cross tightening sequence. Overtightening can damage the unit.
7

Driveshaft bolts to transmission flange

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Secures the driveshaft to the transmission output flange. Estimated value. Requires a specific bolt tightening pattern.

Driveshaft

This section covers torque specifications for the driveshaft and its related components, including the center support bearing. Ensuring correct torque is vital for proper driveline balance and preventing vibrations.

1

Driveshaft Center Support Bearing Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Secures the center support bearing to the chassis. Estimated value.
2

Driveshaft Bolts (Transmission to Driveshaft)

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Connects the driveshaft to the transmission output flange. Estimated value. Requires a specific bolt tightening pattern.
3

Driveshaft Bolts (Rear Differential to Driveshaft)

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Connects the driveshaft to the rear differential input flange. Estimated value. Requires a specific bolt tightening pattern.

Front Differential

This section details torque specifications for the front differential in Quattro models, including housing, mounting, and fill/drain plugs. Proper torquing is essential for differential function and leak prevention.

1

Front Differential Housing Bolts

M12 x 1.75
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Secures the differential housing to the chassis. Estimated value.
2

Front Differential Mounting Bolts

M10 x 1.5
Torque Value
40 ft-lbs (55 N·m)
Important Notes
Secures the differential to the vehicle subframe. Estimated value.
3

Front Differential Output Flange Bolts

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Attaches the driveshaft to the differential flange. Estimated value. Requires a specific bolt tightening pattern.
4

Front Differential Fill Plug

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Seals the fill port. Estimated value.
5

Front Differential Drain Plug

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Seals the drain port. Estimated value.

Rear Differential

This section provides torque specifications for the rear differential, including housing, mounting, and cover bolts. These torques are critical for structural integrity and preventing fluid leaks.

1

Rear Differential Housing Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Secures the differential housing to the subframe. Estimated value.
2

Rear Differential Mounting Bolts

M12 x 1.75
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Secures the differential to the chassis. Estimated value.
3

Rear Differential Cover Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secures the cover to the differential housing. Estimated value. Use a cross tightening sequence. Overtightening can lead to leaks.
4

Rear Differential Output Flange Bolts

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Attaches the driveshafts to the differential output flange. Estimated value. Requires a specific bolt tightening pattern.
5

Rear Differential Fill Plug

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Seals the fill port. Estimated value.
6

Rear Differential Drain Plug

M18 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Seals the drain port. Estimated value.

Axle Shafts Wheel Hubs

This section includes torque specifications for the axle shafts and wheel hubs. Accurate torque is crucial for wheel bearing preload and overall wheel stability.

1

Axle Shaft Bolt to Differential Flange

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Connects the axle shaft to the differential. Estimated value. Requires a specific bolt tightening pattern.
2

Axle Shaft Nut (at Hub)

M27 x 2.0
Important Notes
Secures the axle shaft to the wheel hub. Always use a new nut and torque to specified value then add 180 degree angular rotation. This is CRITICAL for wheel bearing life and vehicle safety.
3

Wheel Hub Bolts

M12 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Secures the wheel hub to the steering knuckle or rear upright. Estimated value.
4

Wheel Lug Bolts

M14 x 1.5
Torque Value
89 ft-lbs (120 N·m)
Important Notes
Secures the wheel to the wheel hub. Follow the star pattern sequence. Critical for safe operation. Audi Recommended Specification

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 so important?

Proper torque ensures components are securely fastened without being over-tightened. Over-tightening can stretch or break bolts, damage threads, and distort components. Under-tightening can lead to loosening, vibrations, and eventual part failure. For example, a differential bolt that isn't tightened to spec can vibrate loose, causing serious drivetrain damage.

Q2

What tools are required to correctly torque drivetrain bolts?

A calibrated torque wrench is essential. Digital torque wrenches are more precise, but beam or click-type wrenches are acceptable if regularly calibrated. Socket sets, extensions, and possibly universal joints are needed to access all bolts. Ensure you have the correct size socket for each bolt to avoid rounding off corners. You may need to purchase new bolts if the old ones are torque-to-yield.

Q3

What does 'torque-to-yield' mean and how is it different from standard torque specifications?

Torque-to-yield (TTY) bolts are designed to stretch slightly when tightened, providing a more secure clamp. They are typically single-use and MUST be replaced after being removed. Standard torque specs do not stretch the bolt permanently. TTY bolts often have a torque value followed by a specific degree of rotation. For example, a spec might be '30 Nm + 90 degrees'.

Q4

Do torque specifications change for different drivetrain components on the 2017+ Audi S5?

Yes, torque specifications vary significantly between components. Wheel bolts have different specs than driveshaft bolts, which differ from differential bolts. Consult the vehicle’s repair manual or trusted source for the specific component you are working on. Never assume bolt torque specifications are universal.

Q5

Can I reuse all drivetrain bolts after removal?

No. Torque-to-yield bolts, which are common in the drivetrain system, must always be replaced. For other bolts, inspect them for any signs of stretching, thread damage, or rust. If any issues are found, replace the bolt. It's often good practice to replace all fasteners if you're unsure. Check your repair manual for bolt replacement specifications.

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 for applying specific torque values to bolts and fasteners.

  • Click-type mechanism for accurate torque setting
  • Wide torque range suitable for drivetrain components
  • Easy to read scale
Learn more

Torque Wrench (3/8-inch drive)

A smaller torque wrench for accessing more confined areas.

  • Ideal for smaller bolts and fasteners
  • Good for areas with limited access
  • Precise torque application
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit various bolt and nut sizes found in the drivetrain.

  • Variety of sizes to accommodate all fasteners
  • Durable construction for repeated use
  • 6 and 12 point sockets
Learn more

Extension Bars

Extensions to access recessed bolts.

  • Various lengths for reaching difficult areas
  • Strong and durable construction
  • Secure attachment to sockets and torque wrenches
Learn more

Universal Joint

A universal joint to angle the socket for difficult to reach locations.

  • Allows angled application of torque
  • Durable construction to withstand torque
  • Good for use in tight spaces
Learn more
Service Procedures

Front Axle Bolt Torque Procedure

Procedure for correctly torquing bolts on the front axle.

  • Identify the specific bolts to be torqued.
  • Consult the vehicle's service manual for the correct torque specification.
  • Clean the bolt threads and mating surfaces of any debris.
  • Apply the specified torque using a calibrated torque wrench.
  • Double-check the torque to ensure it is within specification.
  • If torque is not correct, loosen the bolt and repeat the procedure.
View full procedure

Rear Differential Bolt Torque Procedure

Procedure for correctly torquing bolts on the rear differential.

  • Identify the specific bolts to be torqued on the rear differential.
  • Consult the service manual for torque specifications.
  • Clean the bolt threads and mating surfaces.
  • Torque the bolts using the specified torque pattern
  • Double-check the torque on all bolts.
View full procedure

Driveshaft Bolt Torque Procedure

Procedure for correctly torquing bolts on the driveshaft.

  • Identify all driveshaft attachment bolts.
  • Consult the service manual for specific torque values for each bolt type.
  • Clean bolt threads and mating surfaces thoroughly.
  • Torque the driveshaft bolts in the specified pattern
  • Recheck torque after a short drive to ensure proper seating of components.
View full procedure

Transmission Mount Bolt Torque Procedure

Procedure for correctly torquing bolts on the transmission mounts.

  • Identify the transmission mount bolts.
  • Consult service manual for correct torque specifications and pattern.
  • Clean threads and mating surfaces.
  • Torque the transmission mount bolts to specification.
  • Check all bolts are secured to the correct torque value.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2019-05-15

Some 2017-2018 S5 models have experienced driveshaft bolt loosening due to improper factory torque application.

2017-2018

Resolution: Inspect driveshaft bolts. Remove and replace any suspect bolts. Retorque all bolts to the specified value using a torque wrench.

Rear Differential Mounting Bolt Noise

2021-01-20

Reports of clunking or knocking noises emanating from the rear differential in 2019-2020 models. These noises can be caused by improper bolt torquing on the differential mounts.

2019-2020

Resolution: Inspect the rear differential mounting bolts and fasteners. Remove and retorque all bolts to specification using the proper sequence.

Front Axle Bolt Corrosion

2022-11-01

Some 2020-2021 models have experienced front axle bolt corrosion. Corrosion can lead to premature failure or difficulty in proper torquing.

2020-2021

Resolution: Inspect front axle bolts for corrosion and replace if corrosion is present. Retorque to factory specifications

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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