BMW M8 2019-present Suspension Bolt Torque Specifications & Fastener Values
BMW M8 2019-present

BMW M8 2019-present Suspension Bolt Torque Specifications

Comprehensive guide to suspension bolt torque specifications for the 2019-Present BMW M8 (F91/F92/F93 chassis). Includes torque values for 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

Strut Shock Assembly

Torque specifications for components related to the strut and shock absorber assembly, including mounting and top mount hardware.

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Tighten mounting bolts evenly to ensure proper alignment. Use new bolts if specified by the manufacturer.
2

Strut/Shock Absorber Top Mount Nut

M8 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Torque can vary slightly based on the specific strut top mount design. Do not overtighten.

Control Arms

Torque specifications for control arm mounting bolts and related hardware.

1

Control Arm Bolts

M14 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Tighten control arm bolts with the vehicle at ride height to ensure correct bushing preload. It is also recommended to replace the bolts after removal.
2

Lower Control Arm Inner Bushing Bolt

M14 x 1.5
Important Notes
This is an estimated value. Actual value can vary. Ensure to replace the bolt. The angle is added after the initial torque spec is met.

Steering

Torque specifications for steering components, including ball joints and tie rod ends.

1

Ball Joint Nut

M12 x 1.25
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Ensure the ball joint stud is properly seated in the knuckle before torquing the nut.
2

Tie Rod End Nut

M10 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Hold the tie rod end stud to prevent it from rotating while tightening the nut. Ensure it is flush to the knuckle prior to torquing.
3

Steering Gear/Rack Bolts

M14 x 1.5
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Tighten steering rack bolts evenly to ensure proper alignment and prevent binding.

Sway Bar

Torque specifications for sway bar links and mounting hardware.

1

Sway Bar Link Nut

M10 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Tighten sway bar link nuts evenly. Ensure the sway bar link is properly seated.
2

Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Do not overtighten these bolts to avoid crushing the bushings.

Axle Hub

Torque specifications for axle and wheel hub components.

1

Axle Shaft to Wheel Hub Nut/Bolt

M24 x 1.5
Torque Value
250 ft-lbs (339 N·m)
Important Notes
Estimated value, torque can vary slightly based on vehicle submodel. This is a critical torque that ensures proper wheel bearing preload.

Ride Height Sensor

Torque specifications for ride height sensor linkage.

1

Ride Height Sensor Linkage Bolt/Nut

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value. Do not overtighten. Ensure sensor is not preloaded before tightening.

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 specific torque specifications important for suspension bolts?

Proper torque ensures the bolts are tight enough to maintain joint integrity and prevent loosening under stress, but not so tight as to damage the bolt or surrounding components. Over-tightening can cause bolt stretch or breakage, while under-tightening can lead to joint failure, suspension misalignment, and potentially dangerous handling characteristics. This is especially critical in a high-performance vehicle like the M8.

Q2

What happens if I over-torque a suspension bolt?

Over-torquing can stretch the bolt beyond its yield point, weakening it. This can lead to premature failure, bolt breakage, or damage to the threaded component. You may also cause damage to rubber bushings or mounting points. In severe cases, an over-torqued suspension bolt could fail suddenly, resulting in a loss of control. It may be necessary to replace the damaged components.

Q3

What happens if I under-torque a suspension bolt?

Under-torqued bolts can come loose during driving due to vibration and load. This can cause suspension components to shift, resulting in poor alignment, uneven tire wear, and instability. A loose bolt can also cause damage to other suspension parts due to movement and vibration. In a worst-case scenario, a component could detach completely, leading to loss of control and accidents.

Q4

Do I need to replace suspension bolts when working on the suspension?

It is highly recommended to replace certain bolts, especially torque-to-yield bolts (TTY), which are designed to stretch slightly when tightened to the correct torque. Reusing these bolts can lead to inaccurate torque and potential failures. BMW often specifies which bolts should be replaced after removal in their technical service documents.

Q5

Should I use anti-seize or thread locker on suspension bolts?

Generally, it's not recommended to use anti-seize on suspension bolts, as it affects the friction coefficient and torque readings. Always follow BMW's specific instructions. Thread locker is typically recommended only in specific locations when noted by BMW service information. Always use new bolts and apply the specific amount of torque per BMW specs without any extra lubrication on the bolt.

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 tightening suspension bolts to their specified values.

  • Wide torque range (typically 20-200 Nm)
  • Click-type or digital readout for precise settings
  • Calibrated and certified for accuracy
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench is useful for bolts that require lower torque settings.

  • Smaller torque range (typically 5-80 Nm)
  • Click-type or digital readout for precise settings
  • Calibrated and certified for accuracy
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit various bolt heads used in the BMW M8's suspension system.

  • Various sizes ranging from 10mm to 24mm (or larger)
  • 6-point sockets for a secure fit
  • Made from hardened steel for durability
Learn more

Extension Bars (Various Lengths)

Extension bars help access hard-to-reach bolts in the suspension assembly.

  • Available in various lengths
  • 1/2" and 3/8" drive sizes
  • Made from durable material
Learn more

Universal Joint (U-Joint)

Allows access to bolts at an angle.

  • 1/2" and 3/8" drive sizes
  • Durable construction
  • Smooth movement
Learn more
Service Procedures

Front Suspension Component Torque Procedure

Detailed procedure for torquing all relevant bolts in the front suspension of a 2019-Present BMW M8.

  • Identify the specific bolt to be tightened using diagrams in the repair manual.
  • Select the correct socket and attach it to the torque wrench.
  • Set the torque wrench to the specified value (Refer to specifications below - specific values not to be included in the resource)
  • Carefully position the socket on the bolt head ensuring it is seated correctly.
  • Apply slow and even pressure to the torque wrench until the 'click' is heard or the digital readout indicates the desired torque.
  • Double check all bolts to ensure correct torque is achieved.
View full procedure

Rear Suspension Component Torque Procedure

Detailed procedure for torquing all relevant bolts in the rear suspension of a 2019-Present BMW M8.

  • Identify the specific bolt to be tightened using diagrams in the repair manual.
  • Select the correct socket and attach it to the torque wrench.
  • Set the torque wrench to the specified value (Refer to specifications below - specific values not to be included in the resource).
  • Carefully position the socket on the bolt head ensuring it is seated correctly.
  • Apply slow and even pressure to the torque wrench until the 'click' is heard or the digital readout indicates the desired torque.
  • Double check all bolts to ensure correct torque is achieved.
View full procedure
Technical Service Bulletins

Front Lower Control Arm Bolt Loosening Issue

2021-05-15

Some reports indicate front lower control arm bolts may loosen prematurely, leading to alignment issues and unusual wear.

2019-2020 M8 (All variants)

Resolution: Inspect bolts for loosening. Replace with new bolts and apply thread-locking compound. Torque to the correct specification. Re-inspect after 500 miles.

Rear Suspension Subframe Bolt Inspection

2022-11-01

This bulletin outlines the proper procedure for inspecting rear subframe bolts after any suspension work or major impact.

2019-2022 M8 (All variants)

Resolution: Remove bolts one at a time and inspect for elongation, bending, or damage. Replace if necessary. Torque all bolts to the correct specification in stages. Re-inspect at next service interval.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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