Subaru Subaru WRX 2014-2021 Suspension Bolt Torque Specifications & Fastener Values
Subaru Subaru WRX 2014-2021

Subaru Subaru WRX 2014-2021 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on 2014-2021 Subaru WRX models. Includes front and rear suspension components, recommended torque values, and safety tips.

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

Components that make up the front suspension system, including struts, control arms, and steering knuckles.

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Value
54 ft-lbs (73 N·m)
Important Notes
Secure the strut or shock absorber to the vehicle's frame or suspension components.
2

Control Arm Bolts

M12 x 1.25
Torque Value
54 ft-lbs (73 N·m)
Important Notes
Attach the control arms to the frame or suspension components, maintaining the vehicle's ride height and stability.
3

Upper Control Arm Bushing Bolts

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Secure the upper control arm bushings to the frame or suspension components, maintaining proper suspension geometry and preventing bushing damage. (Estimated value)
4

Lower Control Arm Bolts

M14 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Attach the lower control arm to the frame or suspension components, ensuring proper ride height and stability. (Estimated value)

Steering system

Components that make up the steering system, including steering knuckles, tie rods, and ball joints.

1

Steering Knuckle Bolts

M16 x 1.5
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Secure the steering knuckle to the frame or suspension components, maintaining proper steering alignment and stability. (Estimated value)
2

Ball Joint Nut

M12 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Secure the ball joint to the control arm or steering knuckle, allowing for smooth movement and maintaining proper suspension geometry.
3

Tie Rod End Nut

M10 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secure the tie rod end to the steering knuckle or control arm, ensuring proper steering alignment and stability.

Sway bar system

Components that make up the sway bar system, including sway bar links and coil spring mounts.

1

Sway Bar Link Nut

M12 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Secure the sway bar link to the sway bar or control arm, maintaining the vehicle's roll resistance and stability.
2

Coil Spring Mounting Bolts

M14 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Secure the coil spring to the strut or shock absorber, ensuring proper ride height and stability. (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

What is the recommended torque specification for the suspension bolts on my 2014-2021 Subaru WRX?

The recommended torque specification for the suspension bolts on your 2014-2021 Subaru WRX is 74 ft-lbs (100 Nm) for the front lower control arm bolts, 64 ft-lbs (87 Nm) for the front upper control arm bolts, and 55 ft-lbs (75 Nm) for the rear lower control arm bolts. It's essential to consult your owner's manual or a repair manual for specific torque values, as they may vary depending on the component and location.

Q2

Why is it important to follow the recommended torque specification for suspension bolts?

Following the recommended torque specification for suspension bolts is crucial to ensure the safety and performance of your vehicle. Over-torquing can damage the threads or strip the bolts, while under-torquing can lead to loose connections and compromised handling. Proper torque values help maintain the structural integrity of the suspension system and prevent premature wear.

Q3

How often should I check and maintain the suspension bolts on my Subaru WRX?

It's recommended to check the suspension bolts every 12,000 to 15,000 miles or during routine maintenance, such as oil changes or tire rotations. Inspect the bolts for signs of wear, corrosion, or damage, and re-torque them as needed. Additionally, consider replacing the bolts every 50,000 to 60,000 miles or if you notice any issues with the suspension system.

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

A precision tool used to apply a specific torque to fasteners.

  • Adjustable torque settings
  • Built-in torque scale
Learn more

Socket Set

A set of sockets in various sizes to fit suspension bolts.

  • Includes metric sizes
  • Durable construction
Learn more

Breaker Bar

A long-handled tool used to loosen tight bolts.

  • High leverage design
  • Durable steel construction
Learn more
Service Procedures

Front Strut Bolt Torque Specification

Procedure to apply the correct torque to front strut bolts.

  • Lift the vehicle and secure it on jack stands.
  • Locate the front strut bolts.
  • Using a torque wrench, tighten the bolts to 129 Nm (95 ft-lbs).
View full procedure

Rear Shock Absorber Bolt Torque Specification

Procedure to apply the correct torque to rear shock absorber bolts.

  • Lift the vehicle and secure it on jack stands.
  • Locate the rear shock absorber bolts.
  • Using a torque wrench, tighten the bolts to 43 Nm (32 ft-lbs).
View full procedure

Front Lower Control Arm Bolt Torque Specification

Procedure to apply the correct torque to front lower control arm bolts.

  • Lift the vehicle and secure it on jack stands.
  • Locate the front lower control arm bolts.
  • Using a torque wrench, tighten the bolts to 118 Nm (87 ft-lbs).
View full procedure
Technical Service Bulletins

Suspension Bolt Overtightening Issue

2016-05-12

Reports of suspension bolts being overtightened during assembly.

2015-2016 Subaru WRX

Resolution: Inspect all suspension bolts for proper torque and retighten if necessary.

Rear Suspension Noise Investigation

2018-08-23

Investigation into rear suspension noise related to loose bolts.

2017-2018 Subaru WRX

Resolution: Check rear suspension bolts for proper torque and retighten to specifications.

Front Strut Mount Bolt Loosening

2020-03-15

Front strut mount bolts found to loosen over time.

2019-2020 Subaru WRX

Resolution: Apply thread locker and retighten front strut mount bolts to 129 Nm (95 ft-lbs).

About the Author

Expert automotive knowledge and experience

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Subaru Specs. All rights reserved.

Privacy Policy Terms of Service