BMW M4 2014-2020 Suspension Bolt Torque Specifications & Fastener Values
BMW M4 2014-2020

BMW M4 2014-2020 Suspension Bolt Torque Specifications

Comprehensive guide to suspension bolt torque specifications for the 2014-2020 BMW M4 (F82 Coupe and F83 Convertible) models. Includes torque values for various suspension 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

Strut Shock Assembly

This section details torque specifications for components related to the strut and shock absorber assembly, including mounting bolts and top mounts.

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
These bolts secure the strut/shock absorber assembly to the vehicle's chassis/body at both upper and lower mounting points. Ensure threads are clean. Use a calibrated torque wrench.
2

Front Strut Top Mount Nuts/Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
These fasteners secure the top of the strut assembly to the chassis. Over-tightening can damage bushings. Torque in a cross pattern if multiple fasteners are present. This is an estimated value.
3

Camber Adjustment Bolt

M14 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
This bolt is used to adjust the camber angle, located on the strut assembly. Ensure the adjustment is correct before tightening. This is an estimated value based on similar size bolts.

Control Arms

This section provides torque specifications for bolts related to control arms, ball joints, and connections to the knuckle.

1

Control Arm Bolts

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
These bolts fasten the control arms to the chassis/subframe. Ensure the suspension is at ride height when tightening if bushings are present. Use new bolts if the original ones are torque-to-yield. These bolts are one-time use.
2

Ball Joint Nut

M12 x 1.25
Torque Value
75 ft-lbs (102 N·m)
Important Notes
This nut secures the ball joint to the control arm or steering knuckle. Ensure the joint is properly seated. Use a new nut if the original was a prevailing torque nut. This is an estimated value based on similar size bolts.
3

Lower Control Arm to Knuckle Bolt

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
This bolt connects the lower control arm to the steering knuckle. Use a new bolt if the old one was torque to yield. These bolts are one-time use. Ensure the suspension is at ride height when tightening.

Steering System

This section details torque specifications for steering components such as tie rod ends and the steering gear/rack.

1

Tie Rod End Nut

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
This nut connects the tie rod to the steering knuckle. Check wheel alignment after replacement. Use a new nut if the original one was a prevailing torque nut.
2

Steering Gear/Rack Bolts

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
These bolts secure the entire steering rack unit to the vehicle's subframe or chassis. Ensure the rack is properly aligned before tightening. Use new bolts if the original ones were torque to yield. These bolts are one-time use.

Sway Bar System

This section provides torque specifications for sway bar link connections.

1

Sway Bar Link Nut

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
These nuts connect the sway bar to the suspension. Ensure the links are properly aligned before tightening. Use a new nut if the original one was a prevailing torque nut. This is an estimated value based on similar size bolts.

Rear Suspension Springs

This section details torque specifications for bolts related to rear suspension springs and control arms.

1

Rear Spring Upper/Lower Control Arm/Spring Seat Bolts/Nuts

M12 x 1.5
Important Notes
These fasteners hold the springs, spring seat, and control arm parts to the chassis. Tighten to the specified torque, then additionally tighten 90 degrees. These bolts are one time use. This is an estimated value based on similar size bolts.

Wheel Hub Bearing

This section details torque specifications for the wheel hub/bearing assembly.

1

Wheel Hub/Bearing Bolts

M14 x 1.5
Important Notes
These bolts attach the wheel hub/bearing assembly to the steering knuckle or trailing arm. Tighten to the specified torque, then additionally tighten 90 degrees. These bolts are one-time use.

Subframe

This section details torque specifications for both front and rear subframe mounting bolts.

1

Front Subframe Bolts/Nuts

M14 x 1.5
Important Notes
These fasteners secure the front subframe to the chassis. Tighten to the specified torque, then additionally tighten 90 degrees. Use new bolts as these are one-time use.
2

Rear Subframe Bolts/Nuts

M14 x 1.5
Important Notes
These fasteners secure the rear subframe to the chassis. Tighten to the specified torque, then additionally tighten 180 degrees. Use new bolts as these are one-time use.

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 accurate torque specifications important for suspension bolts?

Accurate torque is critical for suspension safety and performance. Under-torquing can lead to loosening, component movement, and potential failure, while over-torquing can damage bolts, threads, or the components themselves. Improper torque can also negatively impact alignment and handling. For example, an undertorqued lower control arm bolt could cause the arm to shift under load, leading to instability and uneven tire wear.

Q2

Should I use new bolts when reassembling the suspension?

It is highly recommended to use new bolts, especially for critical suspension components. Many suspension bolts are torque-to-yield (TTY), meaning they stretch upon initial tightening and should not be reused. Reusing TTY bolts can result in improper clamping force, leading to component failure. Even non-TTY bolts can stretch or weaken after use and it's best to replace them to ensure accurate clamping force is achieved. Always consult the BMW repair manual to confirm which bolts are TTY.

Q3

What should I do if I think I may have stripped a thread during tightening?

If you suspect you have stripped a thread, immediately stop tightening. Attempting to force it further can worsen the damage. Inspect the bolt and the threads in the component carefully. You may need to use a thread chaser or tap to repair damaged threads. If damage is severe, the component may need replacement. In many cases helicoils or similar thread repair inserts may be required.

Q4

Do I need to apply any kind of thread lubricant when tightening suspension bolts?

The need for thread lubricant depends on the specific bolt and BMW's recommendations. Some bolts have a dry coating which requires them to be torqued without lubrication, while others require a light coating of a specific lubricant. Always refer to the BMW repair manual (e.g., ISTA) for specific recommendations. Using the incorrect lubricant or method can affect the achieved clamping force. Applying a lubricant where none is required might result in over-tightening of the fastener and damage the bolt or component.

Q5

How often should I check my suspension bolt torque?

It's good practice to re-check suspension bolt torque after an initial break-in period (e.g., 50-100 miles after suspension work). Suspension components can settle, which might cause some fasteners to loosen slightly. Afterward, you can make it a habit to check them annually or every 10,000-15,000 miles, especially if you frequently track your vehicle or drive on rough roads. Also check the fasteners before any track or performance driving events.

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 accurate tightening of suspension bolts.

  • Click-type mechanism for precise torque application
  • Range of 20-150 ft-lbs (or equivalent in Nm)
Learn more

Torque Wrench (3/8 inch Drive)

Smaller torque wrench for bolts with lower torque specifications.

  • Click-type mechanism for precise torque application
  • Range of 5-50 ft-lbs (or equivalent in Nm)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is necessary for accessing various suspension bolts.

  • Sizes ranging from 10mm to 24mm (or larger)
  • 6-point sockets recommended for better grip
Learn more

Socket Extensions

Various lengths of socket extensions will allow for easier access to recessed bolts.

  • 3-inch, 6-inch and 10-inch lengths
  • 1/2 inch and 3/8 inch drive options
Learn more

Universal Joint

A universal joint adapter will allow for tightening of bolts at an angle.

  • 1/2 inch and 3/8 inch drive options
  • Durable construction
Learn more

Allen/Hex Bit Set (Metric)

Some suspension components use allen/hex bolts, this tool is required to torque these bolts.

  • Sizes ranging from 4mm to 10mm
  • Durable construction
Learn more
Service Procedures

Front Strut Bolt Torque Procedure

Procedure for tightening the bolts securing the front strut assembly to the chassis.

  • Loosen the wheel nuts and jack up the vehicle and securely place on jack stands.
  • Remove the front wheel.
  • Locate the strut mounting bolts at the top and bottom of the strut.
  • Using the correct socket, initially tighten the bolts by hand.
  • Using the torque wrench, torque the upper strut bolts to 30 ft-lbs (40 Nm) + 90 degrees. Refer to specific torque specs for your M4 model year
  • Using the torque wrench, torque the lower strut bolts to 59 ft-lbs (80 Nm) + 90 degrees. Refer to specific torque specs for your M4 model year
  • Reinstall the wheel and lower the vehicle.
  • Torque the wheel bolts to the manufacturer's specification
View full procedure

Rear Shock Absorber Bolt Torque Procedure

Procedure for tightening the bolts securing the rear shock absorber assembly to the chassis.

  • Loosen the wheel nuts and jack up the vehicle and securely place on jack stands.
  • Remove the rear wheel.
  • Locate the shock absorber mounting bolts at the top and bottom.
  • Using the correct socket, initially tighten the bolts by hand.
  • Using the torque wrench, torque the upper shock bolts to 30 ft-lbs (40 Nm) + 90 degrees. Refer to specific torque specs for your M4 model year
  • Using the torque wrench, torque the lower shock bolts to 59 ft-lbs (80 Nm) + 90 degrees. Refer to specific torque specs for your M4 model year
  • Reinstall the wheel and lower the vehicle.
  • Torque the wheel bolts to the manufacturer's specification
View full procedure

Control Arm Bolt Torque Procedure

Procedure for tightening the various control arm bolts.

  • Loosen the wheel nuts and jack up the vehicle and securely place on jack stands.
  • Remove the wheel.
  • Locate the inner and outer control arm bolts.
  • Using the correct socket, initially tighten the bolts by hand.
  • Using the torque wrench, torque the control arm bolts to 77 ft-lbs (105 Nm) + 90 degrees. Refer to specific torque specs for your M4 model year
  • Reinstall the wheel and lower the vehicle.
  • Torque the wheel bolts to the manufacturer's specification
View full procedure
Technical Service Bulletins

Suspension Bolt Corrosion Issue

2017-05-15

Some 2014-2016 M4 models may experience corrosion on suspension bolts, particularly in regions with high road salt usage.

2014-2016

Resolution: Inspect all suspension bolts for corrosion. Replace any corroded bolts with updated, corrosion-resistant hardware. Use anti-seize compound on bolt threads during reassembly.

Rear Subframe Bolt Retorque

2018-12-01

A bulletin has been released to retorque the rear subframe bolts on certain 2017-2019 models due to slight settling.

2017-2019

Resolution: Loosen, then retorque the rear subframe bolts to 96 ft-lbs (130 Nm) + 90 degrees. Ensure to follow the specified tightening pattern

Front Strut Upper Mount Noise

2019-03-20

Reports of creaking noises from the front strut upper mount on 2018-2020 models have surfaced, potentially related to bolt torque.

2018-2020

Resolution: Inspect the upper strut mount bolts. Loosen and retorque them to specification, replace upper mount if noise persists.

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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