Subaru Subaru Outback 2015-2019 Suspension Bolt Torque Specifications & Fastener Values
Subaru Subaru Outback 2015-2019

Subaru Subaru Outback 2015-2019 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 2015-2019 Subaru Outback, including 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 Absorber

This subsystem includes bolts that secure the strut or shock absorber to the vehicle's chassis and suspension components. Proper torque ensures correct suspension operation and alignment.

1

Strut/Shock Absorber Mounting Bolts

M10 x 1.25
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Ensure bolts are tightened evenly to avoid misalignment.
2

Strut Tower Mounting Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on similar components. Ensure proper alignment before tightening.

Control Arm

This subsystem includes bolts and nuts that connect the control arm to the frame, wheel hub, and steering knuckle. Proper torque ensures stability, alignment, and safe steering.

1

Control Arm Bolts

M12 x 1.75
Torque Value
64 ft-lbs (87 N·m)
Important Notes
Ensure the control arm is properly aligned before tightening.
2

Ball Joint Nut

M10 x 1.25
Torque Value
51 ft-lbs (69 N·m)
Important Notes
Ensure the ball joint is properly seated before tightening.

Steering

This subsystem includes bolts and nuts that connect the steering rack, tie rod ends, and steering gear. Proper torque ensures precise steering and alignment.

1

Tie Rod End Nut

M8 x 1.25
Torque Value
36 ft-lbs (49 N·m)
Important Notes
Ensure the tie rod end is properly aligned with the steering knuckle.
2

Steering Gear/Rack Bolts

M10 x 1.5
Torque Value
51 ft-lbs (69 N·m)
Important Notes
Ensure the steering rack is properly aligned with the subframe.

Sway Bar

This subsystem includes bolts and nuts that secure the sway bar and its links to the suspension. Proper torque ensures effective roll control and handling.

1

Sway Bar Link Nut

M8 x 1.25
Torque Value
27 ft-lbs (37 N·m)
Important Notes
Ensure the sway bar link is properly aligned with the sway bar and suspension.
2

Rear Sway Bar Mounting Bolts

M8 x 1.25
Torque Value
28 ft-lbs (38 N·m)
Important Notes
Estimated value based on similar components. Ensure proper alignment before tightening.

Wheel Hub

This subsystem includes bolts and nuts that secure the wheel hub, drive axle, and CV joint. Proper torque ensures proper power transfer and wheel stability.

1

Wheel Lug Nuts

M12 x 1.5
Torque Value
89 ft-lbs (121 N·m)
Important Notes
Always use a star pattern when tightening wheel lug nuts.
2

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
58 ft-lbs (78 N·m)
Important Notes
Ensure the drive axle is properly seated in the wheel hub.
3

CV Joint/Axle Nut

M24 x 1.5
Torque Value
152 ft-lbs (206 N·m)
Important Notes
Ensure the axle nut is properly seated and tightened to prevent wheel separation.

Subframe

This subsystem includes bolts that secure the subframe to the vehicle's chassis. Proper torque ensures structural integrity and alignment.

1

Subframe Mounting Bolts

M12 x 1.75
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Estimated value based on similar components. Ensure proper alignment before tightening.

Rear Suspension

This subsystem includes bolts that secure the rear trailing arm and hub carrier. Proper torque ensures stability and alignment.

1

Rear Trailing Arm Bolts

M12 x 1.75
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Estimated value based on similar components. Ensure proper alignment before tightening.
2

Rear Hub Carrier Bolts

M12 x 1.75
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Estimated value based on similar components. Ensure proper alignment 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

What are the torque specifications for the front suspension bolts on a 2015-2019 Subaru Outback?

The front suspension bolts, including the strut-to-knuckle bolts and lower control arm bolts, typically require a torque of 129-144 ft-lbs (175-195 Nm). Always refer to the vehicle's service manual for exact specifications, as variations may exist depending on trim level or modifications.

Q2

How often should suspension bolts be checked for proper torque?

Suspension bolts should be checked for proper torque during routine maintenance, such as tire rotations or suspension inspections, or after any suspension-related repairs. It's also recommended to check them after driving on rough terrain or if you notice unusual noises or handling issues.

Q3

Can I reuse suspension bolts after removal?

Subaru recommends replacing suspension bolts after removal, as they are often torque-to-yield (TTY) bolts designed for one-time use. Reusing them can compromise their integrity and lead to failure. Always use new bolts and follow the manufacturer's guidelines.

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 a fastener such as a nut or bolt.

  • Adjustable torque settings
  • Durable construction
Learn more

Socket Set

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

  • Multiple sizes included
  • Durable chrome vanadium steel
Learn more

Breaker Bar

A long-handled tool used to loosen tight bolts.

  • Extended leverage
  • High torque capacity
Learn more
Service Procedures

Front Strut Assembly Torque Specifications

Procedure to properly torque the front strut assembly bolts on a 2015-2019 Subaru Outback.

  • Lift the vehicle and secure it on jack stands.
  • Remove the front wheels to access the strut assembly.
  • Tighten the strut-to-knuckle bolts to 129 Nm (95 ft-lbs).
  • Tighten the strut top nut to 39 Nm (29 ft-lbs).
  • Reinstall the wheels and lower the vehicle.
View full procedure

Rear Shock Absorber Torque Specifications

Procedure to properly torque the rear shock absorber bolts on a 2015-2019 Subaru Outback.

  • Lift the vehicle and secure it on jack stands.
  • Remove the rear wheels to access the shock absorber.
  • Tighten the lower shock bolt to 88 Nm (65 ft-lbs).
  • Tighten the upper shock nut to 39 Nm (29 ft-lbs).
  • Reinstall the wheels and lower the vehicle.
View full procedure
Technical Service Bulletins

Suspension Noise During Cold Weather

2017-11-15

Some 2015-2019 Subaru Outback models may exhibit suspension noise in cold weather conditions.

2015-2019 Subaru Outback

Resolution: Inspect and replace suspension components if necessary. Ensure all bolts are torqued to the correct specifications.

Front Strut Mount Inspection

2018-03-22

Front strut mounts may develop noise or wear prematurely.

2015-2019 Subaru Outback

Resolution: Inspect the front strut mounts for wear and replace if necessary. Torque the strut top nut to 39 Nm (29 ft-lbs) during reassembly.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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