Buick Regal 2018-present Suspension Bolt Torque Specifications & Fastener Values
Buick Regal 2018-present

Buick Regal 2018-present Suspension Bolt Torque Specifications

This page provides detailed torque specifications for suspension bolts on the 2018-Present Buick Regal, including front and rear suspension components. Ensure accurate torque values for safe and reliable vehicle operation.

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

Specifications for the front suspension components of the Buick Regal, including control arms, struts, sway bar, and brake components. Proper torque is critical for safety and handling.

1

Upper Control Arm to Frame Bolts

M12 x 1.75
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Secures the upper control arm to the vehicle's frame. Critical for maintaining proper suspension geometry and vehicle stability. If loose, it can cause instability and improper wheel alignment.
2

Upper Control Arm to Knuckle Ball Joint Nut

M12 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Connects the upper control arm to the steering knuckle. Crucial for proper wheel movement and steering control. Over-tightening can damage the ball joint.
3

Lower Control Arm to Frame Bolts

M14 x 2.0
Torque Value
120 ft-lbs (163 N·m)
Important Notes
Attaches the lower control arm to the vehicle frame. This is a critical connection that bears a significant amount of load. Loose bolts can lead to suspension instability and failure. Estimated value.
4

Lower Control Arm to Knuckle Ball Joint Nut

M12 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Connects the lower control arm to the steering knuckle via a ball joint. Ensures proper pivot of the wheel. Correct torque ensures the ball joint is secure but not over-stressed.
5

Strut Assembly Upper Mount Bolts

M10 x 1.5
Important Notes
These secure the strut assembly to the vehicle body. Critical for proper suspension support and stability. The angle-tightening ensures the proper clamping force.
6

Strut Assembly Lower Mounting Bolts

M14 x 2.0
Torque Value
100 ft-lbs (136 N·m)
Important Notes
Connects the strut to the steering knuckle. Supports the weight of the vehicle and controls suspension movement. Loose bolts can result in rattling and unstable handling. Estimated value.
7

Sway Bar Link to Strut Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Connects the sway bar link to the strut assembly to transfer force during cornering. Important for proper sway bar function.
8

Sway Bar Link to Sway Bar Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Connects the sway bar link to the sway bar to transfer force during cornering. Important for proper sway bar function.
9

Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secure the sway bar to the frame via bushings. Important for correct sway bar function.
10

Brake Caliper Bracket Bolts

M14 x 2.0
Torque Value
111 ft-lbs (150 N·m)
Important Notes
Attaches the brake caliper mounting bracket to the steering knuckle. Critical for braking safety. Estimated value.
Page 1 of 2

Rear Suspension

Specifications for the rear suspension components of the Buick Regal, including control arms, struts, sway bar, and brake components. Proper torque is critical for safety and handling.

1

Upper Control Arm to Frame Bolts

M12 x 1.75
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Secures the upper control arm to the chassis. These bolts affect the vehicle's alignment. Estimated value.
2

Upper Control Arm to Knuckle Bolt

M12 x 1.75
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Connects the upper control arm to the knuckle, facilitating proper wheel movement and alignment. Estimated value.
3

Lower Control Arm to Frame Bolts

M14 x 2.0
Torque Value
120 ft-lbs (163 N·m)
Important Notes
Secures the lower control arm to the frame. This is a load-bearing part of the suspension. Estimated value.
4

Lower Control Arm to Knuckle Bolt

M14 x 2.0
Torque Value
100 ft-lbs (136 N·m)
Important Notes
Connects the lower control arm to the knuckle, crucial for stability and handling. Estimated value.
5

Rear Strut Assembly Upper Mount Bolts

M10 x 1.5
Important Notes
Secures the top of the strut to the vehicle chassis. Important for proper suspension function. Angle tightening provides proper clamping force.
6

Rear Strut Assembly Lower Mount Bolt

M14 x 2.0
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Attaches the lower strut to the knuckle/control arm. Vital for stability and load transfer. Estimated value.
7

Sway Bar Link to Control Arm Bolt

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Connects the sway bar to the control arm.
8

Sway Bar Bushing Bracket Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the sway bar bushing to the frame. This will maintain proper sway bar function.
9

Brake Caliper Bracket Bolts

M12 x 1.75
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Secures the rear brake caliper bracket. Critical for braking safety. Estimated value.
10

Wheel Speed Sensor Bolt

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Secures the wheel speed sensor which is important for ABS and traction control.

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 for suspension bolts?

Using the correct torque specification is critical for safety and proper vehicle handling. Under-tightening can cause bolts to loosen, leading to component failure and loss of control. Over-tightening can stretch or break bolts, damaging threads and potentially causing catastrophic failure. Correct torque ensures proper clamping force, maintaining joint integrity and component stability during driving.

Q2

Can I reuse suspension bolts?

It is generally NOT recommended to reuse suspension bolts, especially those that are torque-to-yield (TTY) or have locking features. These bolts are designed to stretch upon tightening, and reusing them can lead to insufficient clamping force or bolt failure. Always refer to the vehicle's service manual for specific recommendations. Replacing hardware, especially bolts, is a cheap insurance policy against potential issues.

Q3

What happens if I over-tighten a suspension bolt?

Over-tightening a suspension bolt can cause several problems. The bolt may stretch beyond its yield point, weakening it and potentially leading to fracture. It can also damage the threads in the receiving component, requiring costly repairs. Additionally, over-torqued bolts may create undue stress on surrounding parts, potentially leading to premature wear or failure. This can lead to a dangerous situation, such as suspension component failure at speed. Imagine a control arm separating while cornering - this is what we want to avoid.

Q4

What is torque-to-yield (TTY) and why are they used?

Torque-to-yield (TTY) bolts are designed to stretch a specific amount during tightening. They are used to achieve very precise clamping force. TTY bolts are designed for one-time use and should never be reused, as they are permanently deformed upon tightening. They must always be replaced with new hardware when performing suspension work. Using a used TTY bolt would leave the joint improperly fastened. Many critical suspension bolts use TTY designs.

Q5

How often should I inspect my suspension bolts?

A visual inspection of suspension components and fasteners should be part of your routine vehicle maintenance. Ideally, it should be done every 6 months or during tire rotations or oil changes. However, if you drive frequently on rough roads, or engage in more spirited driving, it's wise to inspect more often. Look for signs of rust, damage, or looseness. Listen for any unusual noises from the suspension.

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 1/2 inch drive torque wrench capable of measuring torque values within the range required for suspension components.

  • Accurate torque measurement
  • Click-type or digital readout
Learn more

Torque Wrench (3/8" Drive)

A 3/8 inch drive torque wrench is useful for smaller fasteners in the suspension system.

  • Accurate torque measurement
  • Click-type or digital readout
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets to fit the various bolt heads and nuts on the Buick Regal suspension.

  • Variety of sizes
  • Durable construction
Learn more

Socket Extensions

Various lengths of socket extensions to reach recessed bolts.

  • Variety of lengths
  • Durable construction
Learn more

Jack Stands

Sturdy jack stands to safely support the vehicle during suspension work.

  • Proper weight rating
  • Adjustable height
Learn more

Vehicle Jack

To lift the vehicle for access to suspension components.

  • Proper weight rating
  • Easy operation
Learn more

Wheel Chocks

To prevent the vehicle from rolling while it's lifted.

  • Durable material
  • Non-slip design
Learn more
Service Procedures

Front Strut Bolt Torque Procedure

Procedure for torquing the bolts securing the front strut assembly to the steering knuckle and the vehicle body.

  • 1. Safely lift and support the vehicle on jack stands.
  • 2. Locate the upper strut mount bolts and lower strut to knuckle bolts.
  • 3. Using the appropriate socket and torque wrench, torque the upper strut mount bolts to the manufacturer's specified torque.
  • 4. Using the appropriate socket and torque wrench, torque the lower strut to knuckle bolts to the manufacturer's specified torque.
  • 5. Double-check all torque settings.
  • 6. Remove jack stands and lower the vehicle.
View full procedure

Rear Control Arm Bolt Torque Procedure

Procedure for torquing the bolts securing the rear control arms to the frame and knuckle.

  • 1. Safely lift and support the vehicle on jack stands.
  • 2. Locate all control arm mounting bolts and nuts.
  • 3. Using the appropriate socket and torque wrench, torque all control arm bolts to the manufacturer's specified torque.
  • 4. Torque all control arm nuts to the manufacturer's specified torque.
  • 5. Double-check all torque settings.
  • 6. Remove jack stands and lower the vehicle.
View full procedure

Sway Bar Link Torque Procedure

Procedure for torquing the sway bar link bolts.

  • 1. Safely lift and support the vehicle on jack stands.
  • 2. Locate the sway bar link mounting bolts/nuts.
  • 3. Using the appropriate socket and torque wrench, torque the sway bar link bolts to the manufacturer's specified torque.
  • 4. Torque all sway bar link nuts to the manufacturer's specified torque.
  • 5. Double-check all torque settings.
  • 6. Remove jack stands and lower the vehicle.
View full procedure
Technical Service Bulletins

Suspension Component Inspection and Torque Verification

2019-07-15

This bulletin outlines the importance of regular suspension component inspections and torque verification, especially after vehicle impact or other significant events.

2018-2019 Buick Regal

Resolution: Inspect all suspension components for damage and verify all bolts are torqued to the manufacturer's specified torque values. Replace any damaged components.

Revised Torque Specifications for Rear Control Arm Bolts

2020-03-22

This bulletin announces an updated torque specification for the rear control arm bolts on certain models due to reports of loosening. Refer to the revised torque specifications.

2018-2020 Buick Regal

Resolution: Torque the rear control arm bolts to the revised specification found within this bulletin. Always refer to the most current service information.

Front Strut Mounting Bolt Torque Inspection

2021-11-01

This bulletin highlights the importance of inspection and proper torque application for the front strut mounting bolts. Loose bolts can lead to suspension issues and noise.

2018-2021 Buick Regal

Resolution: Inspect the torque of the upper and lower strut mounting bolts and torque to manufacturer’s specification. Replace any damaged components and inspect for other suspension wear.

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