Buick Regal 2018-present Body Panel & Frame Bolt Torque Specifications
Buick Regal 2018-present

Buick Regal 2018-present Body & Frame Bolt Torque Specifications

This page provides a comprehensive list of torque specifications for body bolts on the 2018 to present Buick Regal.

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 End Exterior

Torque specifications for components located at the front of the vehicle and exterior body panels. This includes the headlamps, bumper, fenders, hood, and associated mounting hardware.

1

Headlamp Assembly Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensures correct headlamp alignment and prevents vibration. Use a calibrated torque wrench. Do not over tighten. Clean threads before installation.
2

Front Bumper Cover Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value, some retainers may be plastic. Do not over-tighten. Clean threads before installation.
3

Fender Mounting Bolts (Upper)

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Proper torque is crucial for panel alignment and rigidity. Use a calibrated torque wrench. Clean threads before installation.
4

Fender Mounting Bolts (Lower)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Proper torque is crucial for panel alignment and rigidity. Use a calibrated torque wrench. Clean threads before installation.
5

Hood Hinge Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Critical for hood alignment and safety. Use a calibrated torque wrench. Clean threads before installation.
6

Hood Latch Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensures the hood latches securely, which is safety-critical. Use a calibrated torque wrench. Clean threads before installation.

Doors And Components

Torque specifications for door hinges, latches, actuators, handles, and interior panels. This includes all components related to door function and safety.

1

Door Hinge Bolts (Body Side)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Critical fastener for door alignment, function and safety. Use a calibrated torque wrench. Clean threads before installation.
2

Door Hinge Bolts (Door Side)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Critical fastener for door alignment, function and safety. Use a calibrated torque wrench. Clean threads before installation.
3

Door Latch Striker Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Important for proper door closure and latching. Use a calibrated torque wrench. Clean threads before installation.
4

Door Lock Actuator Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Prevents vibration and ensures reliable operation. Use a calibrated torque wrench. Clean threads before installation.
5

Door Handle Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensures handle is securely attached. Use a calibrated torque wrench. Clean threads before installation.
6

Door Interior Panel Screws/Fasteners

N/A
Torque Value
0.5 ft-lbs (0.7 N·m)
Important Notes
Estimated value, use hand-tight + 1/4 turn. These are often plastic fasteners which may break if overtightened.

Rear End Trunk Liftgate

Torque specifications for the rear bumper, tail lamps, trunk/liftgate hinges, latch, and rear spoiler/wing. This includes components for the rear of the vehicle and the trunk or liftgate.

1

Rear Bumper Cover Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value, some are plastic retainers. Do not over-tighten. Clean threads before installation.
2

Tail Lamp Assembly Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Prevents vibration and ensures correct sealing. Use a calibrated torque wrench. Clean threads before installation.
3

Trunk/Liftgate Hinge Bolts (Body Side)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Crucial for correct alignment and function. Use a calibrated torque wrench. Clean threads before installation.
4

Trunk/Liftgate Hinge Bolts (Trunk/Liftgate Side)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Crucial for correct alignment and function. Use a calibrated torque wrench. Clean threads before installation.
5

Trunk/Liftgate Latch Striker Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Proper torque is critical for secure latching. Use a calibrated torque wrench. Clean threads before installation.
6

Rear Spoiler/Wing Mounting Bolts

M6 x 1.0
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Proper torque is crucial for secure mounting and aerodynamics. Use a calibrated torque wrench. Clean threads before installation.

Interior Miscellaneous

Torque specifications for interior components such as seat, seat belt mounting, dashboard/instrument panel, and center console. Includes important safety-related fasteners.

1

Seat Mounting Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Critical for passenger safety, always use new bolts. Use a calibrated torque wrench. Clean threads before installation.
2

Seat Belt Mounting Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Extremely critical for passenger safety, always use new bolts. Use a calibrated torque wrench. Clean threads before installation.
3

Dashboard/Instrument Panel Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Prevents rattles and ensures component stability. Use a calibrated torque wrench. Clean threads before installation.
4

Center Console Mounting Bolts/Screws

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value, use a calibrated torque wrench. Clean threads before installation.

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 torque specifications important for body bolts?

Correct torque ensures proper clamping force, preventing components from loosening due to vibration or stress. Under-tightening can cause parts to rattle or detach, while over-tightening can damage threads or deform the body structure, leading to costly repairs. For example, a fender bolt that's too loose could fall off, while a door hinge bolt that is over-tightened could crack the surrounding metal.

Q2

What happens if I don't have a torque wrench?

While it's highly recommended to use a torque wrench, it's understandable that not everyone owns one. If you don't have a torque wrench it's still important to consider tightening bolts to what is typically deemed 'snug'. Then you would follow that up with a final 1/4th of a turn. It is strongly recommended that you obtain a torque wrench as this is a far more accurate measure of torque, and improper tightening can have safety implications.

Q3

Can I reuse body bolts?

It is generally recommended that you replace bolts with new ones. While most body bolts CAN be re-used, they are prone to slight stretching, which can lead to inconsistent torque readings. For critical applications such as body mounts or core support, it's best practice to use new bolts. Also, always inspect the bolts for damage prior to re-use.

Q4

Where can I find the specific torque specs for my 2018-Present Buick Regal?

Torque specifications can be found in the vehicle's service manual, available online through a subscription service or a physical copy obtained from the manufacturer. You may also find the specifications in some reputable aftermarket repair guides or databases. Always verify the information against an official service manual if you are unsure.

Q5

How do I ensure my torque wrench is accurate?

Regular calibration of your torque wrench is essential for accuracy. Professional calibration services are available, but you can also perform a simple check. Follow the manufacturer instructions for use, storage, and calibration. It is also advisable to not use your torque wrench to 'break' bolts loose as this can affect the wrenches calibration.

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 (1/4" Drive)

A precision instrument used to apply specific torque to fasteners, essential for proper body panel installation.

  • Calibrated for accurate torque readings
  • Click-type or digital display
  • Typically range from 20-200 inch-pounds
Learn more

Torque Wrench (3/8" Drive)

A medium-range precision instrument used to apply specific torque to fasteners, essential for proper body panel installation.

  • Calibrated for accurate torque readings
  • Click-type or digital display
  • Typically range from 10-80 foot-pounds
Learn more

Socket Set (Metric)

A set of sockets compatible with the various bolt head sizes used on the Buick Regal's body.

  • Includes common sizes for body panel fasteners (e.g., 8mm, 10mm, 13mm, 15mm)
  • Durable construction
  • 6-point design for secure grip
Learn more

Extension Bars

Used to reach bolts in recessed or hard-to-access areas.

  • Various lengths available
  • Secure locking mechanism
  • Compatible with socket set
Learn more

Universal Joint

Allows sockets to be used at an angle, useful for bolts in awkward positions.

  • Provides flexibility in tight spaces
  • Durable construction
  • Compatible with socket set
Learn more
Service Procedures

Front Bumper Cover Installation

Procedure for installing the front bumper cover, ensuring correct torque on all fasteners.

  • Position the bumper cover onto the vehicle.
  • Align the mounting holes and install retaining bolts or clips.
  • Using the specified 10mm sockets, tighten the side retainers to 40 inch-lbs.
  • Torque the underbody bolts to 80 inch-lbs.
  • Double-check all bolts for proper torque
View full procedure

Rear Bumper Cover Installation

Procedure for installing the rear bumper cover, ensuring correct torque on all fasteners.

  • Position the rear bumper cover onto the vehicle.
  • Align the mounting holes and install retaining bolts or clips.
  • Using the specified sockets, tighten the side retainers to 40 inch-lbs.
  • Torque the underbody bolts to 80 inch-lbs.
  • Double-check all bolts for proper torque
View full procedure

Fender Panel Installation

Procedure for installing the fender panels, ensuring correct torque on all fasteners.

  • Position the fender panel onto the vehicle.
  • Align the mounting holes and install retaining bolts or clips.
  • Torque the upper fender bolts to 80 inch-lbs
  • Torque the lower fender bolts to 80 inch-lbs.
  • Double-check all bolts for proper torque
View full procedure

Door Panel Installation

Procedure for installing the door panels, ensuring correct torque on all fasteners.

  • Position the door panel onto the vehicle.
  • Align the mounting holes and install retaining bolts or clips.
  • Torque the door panel screws to 40 inch-lbs.
  • Double-check all bolts for proper torque
View full procedure
Technical Service Bulletins

Potential for Loose Front Bumper Fascia Bolts

2019-06-15

Some 2018-2019 Buick Regal models may experience front bumper fascia bolts loosening over time. This could lead to minor movement or noise from the front bumper.

2018-2019

Resolution: Inspect the front bumper fascia bolts and re-torque them to the correct specification (80 inch-lbs). If signs of wear are present, replace the fasteners.

Rear Bumper Alignment Issues

2020-11-20

Reports of inconsistent rear bumper alignment may be caused by improper torque on mounting bolts during factory assembly, or body flex after delivery.

2018-2020

Resolution: Loosen all the rear bumper retaining bolts, re-position the bumper as needed and re-torque to specification (80 inch-lbs). Check the alignment after and make any additional necessary adjustments.

Possible Door Panel Rattling

2022-04-05

Some 2021-2022 Buick Regal models have exhibited door panel rattling due to loose mounting screws or clips.

2021-2022

Resolution: Check the door panel screws and tighten them to 40 inch-lbs. Ensure the clips are properly installed and not damaged or broken. If needed replace door panel clips or screws.

About the Author

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Alan Montanye - Automotive Technical Specialist
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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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