Audi Audi RS5 2017-present Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi RS5 2017-present

Audi Audi RS5 2017-present Drivetrain Bolt Torque Specifications

Detailed torque specifications for bolts in the drivetrain of the 2017-Present Audi RS5 (B9) including 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

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Transmission

Torque specifications for the DL501 S-Tronic transmission components, including housing, oil pan, mechatronics, mounts, and bell housing.

1

Transmission Housing Bolts

M8
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Secures the transmission case halves. Ensure even tightening to prevent leaks and damage.
2

Transmission Oil Pan Bolts

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Seals the oil pan to the transmission housing. Do not overtighten to avoid damaging the pan or gasket.
3

Mechatronics Unit Bolts

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the mechatronics unit. Ensure bolts are evenly tightened to prevent damage to the unit or case.
4

Transmission Mount Bolts

M10
Important Notes
Attaches the transmission to the chassis. This is a torque-to-yield fastener, must be tightened to torque and then angle. Always use new bolts.
5

Bell Housing Bolts (Engine to Transmission)

M12
Important Notes
Connects the engine and transmission. Use a crisscross tightening sequence and torque-to-angle method. Always use new bolts.
6

Dual Clutch Assembly Bolts

M8
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Holds the dual clutch assembly to the transmission input shaft. Torque evenly to ensure proper clutch operation.

Front Differential

Torque specifications for the front differential components, including housing, mounts, ring gear, and output flanges.

1

Differential Housing Bolts

M10
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Holds the differential case halves together. Tighten in a crisscross pattern to ensure even pressure.
2

Differential Mount Bolts

M12
Important Notes
Fastens the differential to the chassis or subframe. Torque-to-angle method. Always use new bolts.
3

Ring Gear Bolts

M10
Important Notes
Attaches the ring gear to the differential carrier. Use a star pattern and torque-to-angle method. Always use new bolts.
4

Output Flange Bolts

M8
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the output flanges to the differential. Tighten evenly to ensure a secure fit.

Rear Differential

Torque specifications for the rear sport differential components, including housing, mounts, ring gear, output flanges and control unit.

1

Differential Housing Bolts

M10
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Holds the differential case halves together. Tighten in a crisscross pattern to ensure even pressure.
2

Differential Mount Bolts

M12
Important Notes
Fastens the differential to the subframe. Use torque-to-angle method and always use new bolts.
3

Ring Gear Bolts

M10
Important Notes
Secures the ring gear to the differential carrier. Use a star pattern and torque-to-angle method. Always use new bolts.
4

Output Flange Bolts

M8
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the output flanges to the differential. Tighten evenly to ensure a secure fit.
5

Rear Differential Control Unit Mounting Bolts

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Holds the control unit for the sport differential. Do not overtighten to avoid damaging the unit.

Driveshafts

Torque specifications for driveshaft components, including transmission/differential flanges, center support bearing, and CV joint bolts.

1

Driveshaft to Transmission Flange Bolts

M10
Important Notes
Attaches the driveshaft to the transmission output flange. Use torque-to-angle method and always use new bolts.
2

Driveshaft to Differential Flange Bolts

M10
Important Notes
Connects the driveshaft to the differential input flange. Use torque-to-angle method and always use new bolts.
3

Center Driveshaft Support Bearing Bolts

M8
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Holds the center support bearing. Tighten evenly to ensure proper support and alignment.
4

CV Joint Bolts

M10
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Secures the CV joint. Torque evenly to maintain joint integrity.

Wheel Hub And Axle

Torque specifications for wheel hub, bearing assembly, axle nuts, and ABS sensor mounting.

1

Wheel Hub/Bearing Assembly Bolts

M14
Important Notes
Attaches the wheel hub to the steering knuckle. Use torque-to-angle method and always use new bolts. Proper preload of the wheel bearing is essential.
2

Axle Nut (Front)

M24
Important Notes
Secures the front axle to the wheel hub. Use torque-to-angle method and always use a new nut. CRITICAL SAFETY FASTENER.
3

Axle Nut (Rear)

M24
Important Notes
Secures the rear axle to the wheel hub. Use torque-to-angle method and always use a new nut. CRITICAL SAFETY FASTENER.
4

ABS Sensor Mounting Bolt

M6
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Secures the ABS sensor. Ensure the sensor is securely mounted for accurate readings.

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 precise torque specifications important for drivetrain bolts?

Precise torque ensures proper clamping force, which is vital for the integrity of the drivetrain. Over-tightening can stretch or break bolts, leading to failure and potential damage. Under-tightening can cause components to loosen, resulting in vibration, noise, and eventual failure. For example, insufficient torque on a driveshaft bolt could lead to a catastrophic failure at high speeds.

Q2

What type of wrench should I use for tightening drivetrain bolts?

A torque wrench is essential. For smaller bolts, a 3/8" drive torque wrench is usually sufficient, while larger bolts, such as those on the differential, require a 1/2" or larger drive. Ensure the torque wrench is calibrated for accurate readings and that you are using the appropriate torque range for the bolt in question. Do NOT use an impact wrench or standard wrench.

Q3

Can I reuse drivetrain bolts?

In most cases, it is NOT recommended to reuse drivetrain bolts, especially torque-to-yield (TTY) bolts. TTY bolts are designed to stretch when tightened to their specified torque, and reusing them can lead to inconsistent clamping forces and potential failure. Always refer to the repair manual for specific instructions for each bolt and its required replacement.

Q4

What should I do if I'm unsure of a torque specification?

If you are unsure of a torque specification, ALWAYS consult the official Audi repair manual (ElsaWeb) or a reputable technical guide specific to the 2017-Present RS5. Never guess. Using incorrect torque settings can be extremely dangerous. When in doubt, seek professional assistance from a trained Audi technician.

Q5

How often should I check drivetrain bolt torque?

Routine checks are not typically required unless a component has been recently serviced or removed. However, after a service, it's prudent to re-check all drivetrain bolts after an initial break-in period of 50-100 miles. This is especially important with items such as the driveshaft, or after differential work.

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 high-quality torque wrench is essential for accurately applying torque to drivetrain bolts.

  • Click-type or digital readout for precise torque application
  • Range suitable for drivetrain components (typically 20-200 ft-lbs)
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench useful for lower torque applications in the drivetrain system.

  • Click type or digital readout for precise torque application
  • Range suitable for smaller drivetrain components (typically 5-80 ft-lbs)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit the various bolt heads in the drivetrain.

  • Variety of sizes including standard and deep sockets
  • Typically 6-point sockets are preferred for drivetrain bolts
Learn more

Socket Extensions

Extensions help reach recessed bolts and fasteners.

  • Variety of lengths
  • 1/2" and 3/8" drive options
Learn more

Universal Joint

A universal joint allows access to bolts at angles.

  • 1/2" and 3/8" drive options
Learn more
Service Procedures

Front Axle Bolt Torque Procedure

This procedure outlines the steps for properly torquing front axle bolts.

  • Locate the specific front axle bolt requiring torque.
  • Refer to manufacturer specification for torque value
  • Using the correct socket, attach it to the torque wrench.
  • Apply torque to the bolt in a smooth, controlled motion until the torque wrench clicks (or displays the target value).
  • Double check that the torque wrench is properly set.
View full procedure

Rear Differential Bolt Torque Procedure

This procedure outlines the steps for properly torquing rear differential bolts.

  • Locate the specific rear differential bolt requiring torque.
  • Refer to manufacturer specification for torque value
  • Using the correct socket, attach it to the torque wrench.
  • Apply torque to the bolt in a smooth, controlled motion until the torque wrench clicks (or displays the target value).
  • Double check that the torque wrench is properly set.
View full procedure

Driveshaft Bolt Torque Procedure

This procedure outlines the steps for properly torquing driveshaft bolts.

  • Locate the specific driveshaft bolt requiring torque.
  • Refer to manufacturer specification for torque value
  • Using the correct socket, attach it to the torque wrench.
  • Apply torque to the bolt in a smooth, controlled motion until the torque wrench clicks (or displays the target value).
  • Double check that the torque wrench is properly set.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

2018-05-15

Some 2017-2018 RS5 vehicles have reported driveshaft bolt loosening. This issue can lead to vibration and noise.

2017-2018

Resolution: Inspect and replace bolts with updated fasteners and apply correct torque using the manufacturer specified torque value and procedure. Use thread locker where required.

Rear Differential Bolt Shear Risk

2020-11-20

Certain 2019-2020 RS5 models have shown a risk of rear differential bolt shearing under high stress conditions.

2019-2020

Resolution: Replace all rear differential bolts with the updated, higher grade fasteners, and apply correct torque using the manufacturer specified torque value and procedure. Double check your tools and ensure proper application.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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