BMW i4 2022-present Suspension Bolt Torque Specifications & Fastener Values
BMW i4 2022-present

BMW i4 2022-present Suspension Bolt Torque Specifications

This page provides a comprehensive list of torque specifications for all suspension bolts on the 2022-Present BMW i4 (G26) model. Includes 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 Suspension

Torque specifications for various components of the front suspension system, including struts, control arms, and steering linkages.

1

Strut Lower Mounting Bolts

M14 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
These bolts secure the strut to the steering knuckle. Ensure proper torque for suspension stability. Estimated value, confirm with service manual.
2

Strut Upper Mount Bolts (to Body)

M8 x 1.25
Torque Value
30 ft-lbs (41 N·m)
Important Notes
These bolts secure the upper strut mount to the body of the vehicle. Do not overtighten. Estimated value, confirm with service manual.
3

Control Arm Mounting Bolts (Frame)

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the control arm to the subframe/chassis. Ensure proper torque for suspension alignment and handling characteristics. Estimated value, confirm with service manual.
4

Control Arm Mounting Bolts (Knuckle)

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the control arm to the steering knuckle. Ensure proper torque for suspension alignment and handling characteristics. Estimated value, confirm with service manual.
5

Lower Control Arm Ball Joint Pinch Bolt

M10 x 1.25
Torque Value
65 ft-lbs (88 N·m)
Important Notes
This bolt secures the lower control arm ball joint to the steering knuckle. Ensure proper torque for joint stability. Estimated value, confirm with service manual.
6

Ball Joint Nut

M16 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
This nut fastens the ball joint to the steering knuckle/control arm. Proper torque is crucial for joint stability. Estimated value, confirm with service manual.
7

Tie Rod End Nut

M14 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
This nut secures the tie rod end to the steering knuckle. Proper torque maintains alignment and minimizes play. Estimated value, confirm with service manual.
8

Sway Bar Link Nut

M10 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
These nuts secure the sway bar link to the sway bar and strut/control arm/chassis. Ensure proper function of sway bar. Estimated value, confirm with service manual.

Rear Suspension

Torque specifications for various components of the rear suspension system, including control arms and toe arms.

1

Rear Control Arm Mounting Bolts (Frame)

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear control arm to the vehicle frame/subframe. Ensure proper torque for stability. Estimated value, confirm with service manual.
2

Rear Control Arm Mounting Bolts (Knuckle)

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear control arm to the rear knuckle. Ensure proper torque for stability and alignment. Estimated value, confirm with service manual.
3

Rear Toe Arm Mounting Bolts (Frame)

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear toe arm to the frame/subframe. Proper torque ensures proper rear wheel alignment. Estimated value, confirm with service manual.
4

Rear Toe Arm Mounting Bolts (Knuckle)

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
These bolts secure the rear toe arm to the rear knuckle. Proper torque ensures proper rear wheel alignment. Estimated value, confirm with service manual.

Steering System

Torque specifications for the steering rack and related mounting components.

1

Steering Rack Mounting Bolts

M12 x 1.75
Torque Value
90 ft-lbs (122 N·m)
Important Notes
These bolts secure the steering rack to the subframe. Essential for proper steering function. Estimated value, confirm with service manual.

Subframe

Torque specifications for subframe mounting bolts, which are critical for overall suspension and vehicle structure.

1

Front Subframe Mounting Bolts

M14 x 2.0
Important Notes
These bolts secure the front subframe to the vehicle chassis. Use a multi-step torque process to properly preload the bolts. Estimated value, confirm with service manual.
2

Rear Subframe Mounting Bolts

M14 x 2.0
Important Notes
These bolts secure the rear subframe to the vehicle chassis. Use a multi-step torque process to properly preload the bolts. Estimated value, confirm with service manual.

Wheel Hub

Torque specifications for wheel hub/bearing mounting bolts, critical for wheel stability and suspension function.

1

Wheel Hub/Bearing Mounting Bolts

M12 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
These bolts secure the wheel hub to the steering knuckle/axle carrier. Ensure proper torque for wheel and bearing integrity. Estimated value, confirm with service manual.

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 specification important?

Using the correct torque specification is crucial for the safe and reliable operation of your BMW i4's suspension. Under-tightening can lead to bolts loosening, causing component failure and potentially dangerous situations. Over-tightening can stretch or break bolts, damage threads, and weaken the connection, also leading to failure. Precise torque ensures proper clamping force and joint integrity.

Q2

What is the consequence of using the wrong torque specification?

Using the wrong torque specification can result in various problems. Under-torqued suspension bolts can cause excessive play in joints, leading to poor handling, increased tire wear, and suspension component damage. Over-torqued bolts can lead to thread damage, bolt failure, and potentially catastrophic suspension collapse. It's a critical aspect of maintenance for safety.

Q3

Do I need to replace suspension bolts after removal?

While not always required, it's highly recommended to replace one-time use, stretch bolts, which are common in modern suspension systems, anytime they are loosened. BMW often uses torque-to-yield bolts that are designed to stretch. Reusing these can result in improper clamping force and failure. Consult your repair manual to verify the specific bolt type used in each connection.

Q4

What type of tools do I need to properly torque suspension bolts?

You'll need a properly calibrated torque wrench to accurately achieve the specified torque values. Ensure your wrench covers the required range for your bolts. You will also likely need a variety of socket sizes and potentially extensions or adapters for specific bolts. For torque-angle specifications, a digital angle gauge is often necessary. Do not rely on 'feel' or estimation.

Q5

Should I apply threadlocker to suspension bolts?

Only apply threadlocker where specified by BMW in the repair manual. Some bolts may come pre-coated, and adding more could cause improper torque values, potentially over-tightening. The manual dictates if, and what specific type, of threadlocker should be used. Some bolts do have a locking feature built in that must be respected.

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 applying precise torque to suspension bolts.

  • Wide torque range (typically 20-200 Nm)
  • Audible click when target torque is reached
  • 1/2" drive for common socket sizes
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench is useful for lower torque settings.

  • Torque range suitable for smaller fasteners (typically 5-80 Nm)
  • Audible click when target torque is reached
  • 3/8" drive for smaller sockets
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolt and nut sizes on the suspension.

  • Variety of sizes (typically 8mm to 24mm)
  • 6-point and 12-point options for better grip
  • Durable construction (chrome vanadium steel)
Learn more

Extension Bars

Extension bars help to reach recessed bolts.

  • Various lengths (typically 3", 6", 10")
  • 1/2" and 3/8" drive options
  • Durable construction
Learn more

Universal Joint (Swivel)

A universal joint allows for angled access to bolts.

  • 1/2" and 3/8" drive options
  • Robust construction for torque application
  • Allows for offset access
Learn more
Service Procedures

Front Strut to Knuckle Bolt Torque Procedure

Procedure for torquing the bolts securing the front strut to the steering knuckle on the BMW i4.

  • Locate the two bolts securing the front strut to the knuckle.
  • Clean the threads of the bolts and the receiving holes.
  • Using the appropriate metric socket, tighten the bolts to 110 Nm plus an additional 90 degree turn. Refer to the service manual for the final torque spec if there is a change.
  • Recheck the torque after initial road test.
View full procedure

Rear Upper Control Arm Bolt Torque Procedure

Procedure for torquing the bolts securing the rear upper control arm to the frame and knuckle on the BMW i4.

  • Locate the two bolts securing the rear upper control arm to the frame and knuckle.
  • Clean the threads of the bolts and the receiving holes.
  • Tighten the frame side bolts to 80 Nm plus an additional 90 degree turn.
  • Tighten the knuckle side bolts to 100 Nm plus an additional 90 degree turn. Refer to the service manual for the final torque spec if there is a change.
  • Recheck the torque after initial road test.
View full procedure

Rear Lower Control Arm Bolt Torque Procedure

Procedure for torquing the bolts securing the rear lower control arm to the frame and knuckle on the BMW i4.

  • Locate the two bolts securing the rear lower control arm to the frame and knuckle.
  • Clean the threads of the bolts and the receiving holes.
  • Tighten the frame side bolt to 120 Nm plus an additional 90 degree turn.
  • Tighten the knuckle side bolt to 100 Nm plus an additional 90 degree turn. Refer to the service manual for the final torque spec if there is a change.
  • Recheck the torque after initial road test.
View full procedure

Sway Bar Link Torque Procedure

Procedure for torquing the bolts securing the sway bar link.

  • Locate the bolts securing the sway bar links to the strut and sway bar.
  • Clean the threads of the bolts and the receiving holes.
  • Tighten the bolts to 70 Nm.
  • Recheck the torque after initial road test.
View full procedure
Technical Service Bulletins

Suspension Bolt Corrosion Advisory

2023-05-15

This bulletin addresses potential corrosion issues with certain suspension bolts on 2022-2023 BMW i4 models.

2022-2023

Resolution: Inspect all suspension bolts for corrosion. If found, replace with the updated bolt specified in the service parts catalog. Ensure proper torque is applied according to the service manual.

Front Strut Bolt Re-Torque Recommendation

2023-01-20

This bulletin recommends re-torquing the front strut to knuckle bolts on 2022-Present BMW i4 models after the initial 1000 mile break-in period.

2022-Present

Resolution: Re-torque the front strut to knuckle bolts to specified torque settings, after the first 1000 miles of driving. Refer to the service manual for correct 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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