BMW M2 2016-2021 Suspension Bolt Torque Specifications & Fastener Values
BMW M2 2016-2021

BMW M2 2016-2021 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 2016-2021 BMW M2 (F87) chassis, including front and rear 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

Front Strut Assembly

Torque specifications for components related to the front strut assembly, including the strut, top mount, and steering knuckle connections.

1

Strut Top Mount to Chassis Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
These bolts secure the strut assembly to the vehicle chassis. Ensure proper alignment before tightening. This is an estimated value.
2

Strut/Shock Absorber Mounting Bolts (Lower)

M14 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
These bolts secure the lower part of the strut to the steering knuckle or control arm. Ensure correct alignment.
3

Steering Knuckle / Hub Carrier to Strut Mounting Bolts

M12 x 1.5
Torque Value
81 ft-lbs (110 N·m)
Important Notes
These bolts connect the steering knuckle to the strut. This is a critical connection for suspension movement and wheel load. This is an estimated value.

Rear Shock Assembly

Torque specifications for components related to the rear shock absorber assembly.

1

Rear Shock Absorber Upper Mounting Bolts

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These bolts secure the upper part of the rear shock to the chassis. This is an estimated value.
2

Rear Shock Absorber Lower Mounting Bolts

M12 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the lower part of the rear shock to the suspension arm. This is an estimated value.

Control Arms

Torque specifications for the control arms, including both upper and lower arm connections.

1

Control Arm Bolts (Chassis Side)

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
These bolts attach the control arms to the vehicle chassis. Ensure proper alignment of the control arm before tightening.
2

Control Arm Bolts (Steering Knuckle Side)

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
These bolts attach the control arms to the steering knuckle. Ensure proper alignment of the control arm before tightening. This value is the same as the chassis side as it's the same bolt.

Ball Joints

Torque specifications for ball joint connections to the control arm and steering knuckle.

1

Ball Joint Nut

M14 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
This nut secures the ball joint to the control arm or steering knuckle. This is an estimated value.

Steering

Torque specifications for tie rod end connections.

1

Tie Rod End Nut

M12 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Ensure the tie rod end is properly aligned before tightening.

Sway Bar

Torque specifications for sway bar links and mounting brackets.

1

Sway Bar Link Nut

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These nuts secure the sway bar links to the sway bar and strut or control arm. Ensure correct alignment.
2

Front Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the sway bar bushing brackets to the chassis. Ensure proper sway bar alignment before tightening. This is an estimated value.
3

Rear Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
These bolts secure the rear sway bar bushing brackets to the chassis. Ensure proper sway bar alignment before tightening. This is an estimated value.

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 using the correct torque specifications important for my BMW M2 suspension?

Using the correct torque specifications ensures that suspension components are properly secured and function as designed. Under-torquing can lead to parts loosening, causing noise, instability, or even component failure. Over-torquing can damage threads, stretch bolts, and weaken the connection, potentially leading to premature failure and unsafe driving conditions. Proper torque ensures the intended clamping force and maintains suspension geometry, critical for performance and safety.

Q2

Do torque specifications change if I install aftermarket suspension components?

Yes, torque specifications can absolutely change with aftermarket suspension components. Always refer to the manufacturer's instructions for the specific aftermarket parts you are installing. Do not assume factory torque specs are applicable. Using incorrect torque on aftermarket components can lead to damage or failure. For example, aftermarket coilovers may use different bolt sizes and materials than OEM, requiring different torque values.

Q3

Should I use new bolts when working on my BMW M2 suspension?

It is highly recommended to replace certain bolts, particularly those that are torque-to-yield (TTY), when working on your BMW M2 suspension. TTY bolts are designed to stretch when torqued, and they should not be reused as they may have lost their clamping force. Consult the BMW repair manual or a reputable source to identify TTY bolts in the suspension. For example, strut mounting bolts are often TTY and should be replaced. Using old bolts can lead to improper clamping and component failure.

Q4

What tools do I need to properly torque suspension bolts?

You will need a calibrated torque wrench, sockets of appropriate sizes, and potentially extensions. A torque wrench with a range that covers the specified torque values is essential. It's also advisable to use high-quality sockets to prevent damaging the bolt heads. For example, a good 1/2 inch drive torque wrench with a range of 30-150 ft-lbs would be sufficient for most of the suspension bolts. Make sure the torque wrench is calibrated regularly.

Q5

How often should I check the torque of my BMW M2 suspension bolts?

It's a good practice to check the torque on your suspension bolts after any major work on the suspension, and periodically – especially after track days or aggressive driving. For normal street driving, checking every 12 months or 10,000 miles is a good rule of thumb. However, it's best to refer to the BMW maintenance schedule for recommended intervals. Loose components can lead to noises, poor handling, and unsafe conditions.

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 manufacturer specifications.

  • 1/2 inch drive for common bolt sizes
  • Wide torque range (e.g., 20-200 Nm)
  • Click-type mechanism for accurate torque application
Learn more

Torque Wrench (3/8 inch drive)

A smaller torque wrench for smaller fasteners and accessing tighter spaces.

  • 3/8 inch drive for smaller bolts
  • Suitable torque range for smaller suspension components (e.g., 10-80 Nm)
  • Digital or click-type variants available
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is necessary to fit the various bolt heads on the BMW M2 suspension.

  • Variety of sizes (e.g., 10mm, 13mm, 16mm, 18mm, 21mm)
  • 6-point design for optimal grip
  • Deep and shallow sockets included
Learn more

Extension Bars (Various Lengths)

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

  • Multiple lengths to provide versatility
  • Sturdy construction to withstand torque loads
  • Compatible with socket set
Learn more

Universal Joint/Swivel Adapter

A universal joint allows socket rotation to reach bolts at odd angles.

  • Allows for angled torque application
  • Durable design for handling torque
  • Compatible with socket set and extensions
Learn more
Service Procedures

Front Strut to Knuckle Bolt Torque Procedure

Detailed steps for torquing the bolts connecting the front strut to the wheel knuckle on the BMW M2.

  • Loosen all strut to knuckle bolts.
  • Install new bolts if recommended by BMW.
  • Hand tighten the bolts ensuring even alignment.
  • Torque the top strut to knuckle bolt to 81 Nm + 90 deg.
  • Torque the lower strut to knuckle bolt to 56 Nm + 70 deg.
  • Double check all torque specifications.
View full procedure

Front Control Arm to Subframe Bolt Torque Procedure

Procedure for correctly torquing the control arm bolts to the front subframe.

  • Loosen and inspect control arm bolts.
  • Install new bolts if recommended by BMW.
  • Hand tighten control arm bolts to subframe.
  • Torque the front control arm to subframe bolt to 100 Nm + 90 deg.
  • Torque the rear control arm to subframe bolt to 100 Nm + 90 deg.
  • Double check torque.
View full procedure

Rear Trailing Arm to Body Bolt Torque Procedure

Steps to correctly torque trailing arm bolts to the body.

  • Loosen and inspect the trailing arm bolts
  • Install new bolts if recommended by BMW.
  • Hand tighten the trailing arm to body bolts.
  • Torque the rear trailing arm to body bolt to 100 Nm + 90 deg.
  • Double check all torques.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

Correct procedure for rear upper control arm bolts.

  • Loosen and inspect the control arm bolts
  • Install new bolts if recommended by BMW.
  • Hand tighten the upper control arm bolts to the body.
  • Torque the rear upper control arm to body bolts to 100 Nm + 90 deg.
  • Double check all torques.
View full procedure
Technical Service Bulletins

Technical Bulletin - Front Suspension Bolt Replacement

2017-03-15

This bulletin outlines the updated procedure and torque specifications for front suspension bolts, specifying they should always be replaced.

2016-2017 BMW M2

Resolution: Always replace the front strut to knuckle bolts and control arm bolts. Torque to specified values using new bolts only.

Technical Bulletin - Rear Suspension Noise Diagnosis

2018-09-22

This bulletin addresses a specific clicking noise emanating from the rear suspension which was found to be caused by improperly torqued rear trailing arm bolts.

2016-2018 BMW M2

Resolution: Retorque rear trailing arm bolts to specification. Inspect for wear and replace if necessary, replacing and retorquing are required per the latest specification.

Technical Bulletin - Updated Torque Specifications for Rear Upper Control Arms

2020-06-10

Updated torque specifications for rear upper control arms.

2018-2021 BMW M2

Resolution: Always torque rear upper control arm to body bolts to 100 Nm + 90 deg

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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