BMW 340i 2012-2018 Body Panel & Frame Bolt Torque Specifications
BMW 340i 2012-2018

BMW 340i 2012-2018 Body & Frame Bolt Torque Specifications

Detailed torque specifications for various body bolts on the 2012-2018 BMW 340i (F30) model, including fenders, bumpers, doors, and other body panels.

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

Fuel System

Torque specifications for components related to the fuel system, including the fuel tank and filler neck.

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Value
27 ft-lbs (37 N·m)
Important Notes
Ensure proper alignment of straps before tightening. Check for even gap and secure fit.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Do not over-tighten these bolts to prevent damage to the fuel filler neck.

Wheel System

Torque specifications for securing the wheels to the vehicle's hubs.

1

Wheel Lug Nuts

M14 x 1.25
Torque Value
88 ft-lbs (120 N·m)
Important Notes
Tighten lug nuts in a star pattern to ensure even pressure. Always use a calibrated torque wrench.

Electrical System

Torque specifications for components related to the electrical system, including battery terminals.

1

Battery Terminal Nuts

M6 x 1.0
Torque Value
5 ft-lbs (7 N·m)
Important Notes
Do not over-tighten battery terminal nuts as damage to the terminals may occur. Ensure terminals are clean and free of corrosion before installation.

Body Panels

Torque specifications for various body panels including hood, fenders, doors and bumpers.

1

Hood Hinge Bolts to Hood

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value. Ensure proper hood alignment before tightening.
2

Hood Hinge Bolts to Body

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value. Ensure proper hinge alignment to the body.
3

Fender Bolts to Body

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Ensure proper fender alignment and gap spacing before tightening.
4

Door Hinge Bolts to Body

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value. Ensure proper door alignment before tightening.
5

Door Hinge Bolts to Door

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value. Ensure proper hinge alignment to the door.
6

Bumper Cover Mounting Bolts/Screws

M6 x 1.0
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Do not over-tighten to avoid damage to the bumper cover.
7

Headlight Mounting Bolts/Screws

M5 x 0.8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Do not over-tighten to avoid cracking the headlight housing.
8

Tail Light Mounting Bolts/Screws

M5 x 0.8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Do not over-tighten to avoid cracking the tail light housing.
9

Grill Mounting Bolts/Screws

M5 x 0.8
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Do not over-tighten to avoid damage to the grill.
10

Rear Hatch/Trunk Lid Hinge Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value. Ensure smooth operation and proper alignment of the hatch/trunk.

Interior

Torque specifications for interior components including seats, seatbelts, and trim.

1

Seat Mounting Bolts to Floor Pan

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated value. Ensure seats are properly aligned and secure.
2

Seat Belt Mounting Bolts to Body/Floor Pan

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Critical for safety, must be properly secured.
3

Interior Trim Fasteners

M4 x 0.7 or equivalent
Torque Value
2 ft-lbs (3 N·m)
Important Notes
Estimated value. Do not over-tighten as plastic may crack.

Exterior Accessories

Torque specifications for exterior accessories such as mirrors and roof racks.

1

Roof Rack Mounting Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Estimated value. Ensure the roof rack is properly aligned before tightening.
2

Side Mirror Mounting Bolts/Screws

M5 x 0.8
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Do not over-tighten, ensure proper mirror positioning.

Door Components

Torque specifications for door lock actuators and handles.

1

Door Lock Actuator Mounting Bolts/Screws

M5 x 0.8
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Ensure proper functionality after installation.
2

Door Handle Mounting Bolts/Screws

M5 x 0.8
Torque Value
6 ft-lbs (8 N·m)
Important Notes
Estimated value. Ensure proper fit and operation of the door handle.

General

Torque specifications for general body panel fasteners

1

General Body Panel Fasteners

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Estimated value. Check the specific application to confirm correct fastener size and torque.

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 it important to use the correct torque specifications for body bolts?

Using the correct torque ensures proper clamping force, preventing bolts from loosening due to vibration, which can lead to rattles, misalignment of body panels, and potential safety issues. Over-torquing can strip threads or damage components.

Q2

What happens if I overtighten a body bolt?

Overtightening can cause damage including stripping threads in the body panel or frame, crushing the bolt's washer, or distorting the panel itself. It can also lead to stress fractures around the bolt hole and in severe cases, component failure. You may also need specialized tools to remove a damaged bolt, increasing repair time and cost.

Q3

Can I use a general torque specification chart instead of the specific BMW values?

No, you should always use the specific torque values recommended by BMW for your vehicle model. Generic charts may not account for the specific materials, bolt sizes, and design tolerances of your 340i. Using the wrong value may lead to damage, or a bolt that loosens prematurely

Q4

How often should I check the torque of my body bolts?

Generally, it's good practice to check body bolt torque after any disassembly or body repair work. Routine checks are not typically necessary unless you notice unusual noises, panel misalignments or after extreme weather events. If your vehicle was in a minor fender bender, it's best to check torque to avoid panel shifting.

Q5

Do I need to use new bolts when reassembling body panels?

While not always required, it's good practice to replace bolts that have been subjected to high torque or have shown signs of wear or corrosion. For critical safety-related bolts, like those around mounting brackets, always refer to the BMW service manual, it's always best to replace when possible. This practice minimizes any chance of premature bolt failure.

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 calibrated torque wrench is essential for applying the correct torque to body bolts. A 1/2" drive is recommended for the typical torque range.

  • Wide torque range (typically 20-150 ft-lbs or higher)
  • Audible click or digital display indicating target torque is reached
  • Reversible ratchet head
Learn more

Torque Wrench (3/8" Drive)

A smaller 3/8" drive torque wrench is useful for tighter spaces and lower torque applications.

  • Lower torque range (typically 5-80 ft-lbs)
  • Audible click or digital display indicating target torque is reached
  • Compact size for maneuverability
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is necessary for various bolt head sizes.

  • Various sizes ranging from 8mm to 21mm (or larger)
  • 6-point or 12-point sockets for secure grip
  • Shallow and deep sockets for different bolt depths
Learn more

Socket Extensions

Extensions help reach bolts in difficult or recessed locations.

  • Varying lengths for different application needs
  • Secure locking mechanism to prevent socket from slipping
  • 3/8" and 1/2" drive options
Learn more

Universal Joint Adapter

Allows access to bolts at angles.

  • 3/8" and 1/2" drive options
  • Durable construction
Learn more
Service Procedures

Front Bumper Cover Removal and Installation

Step-by-step process for removing and installing the front bumper cover, including torque specifications.

  • Locate and remove all screws, bolts and fasteners securing the front bumper cover
  • Disconnect any electrical connections (fog lights, parking sensors)
  • Carefully remove the bumper cover
  • When reinstalling, ensure all alignment tabs are correctly seated
  • Reconnect all electrical connections
  • Install all screws, bolts, and fasteners and torque them to the appropriate specification
View full procedure

Rear Bumper Cover Removal and Installation

Step-by-step process for removing and installing the rear bumper cover, including torque specifications.

  • Locate and remove all screws, bolts and fasteners securing the rear bumper cover
  • Disconnect any electrical connections (parking sensors, taillights)
  • Carefully remove the bumper cover
  • When reinstalling, ensure all alignment tabs are correctly seated
  • Reconnect all electrical connections
  • Install all screws, bolts, and fasteners and torque them to the appropriate specification
View full procedure

Side Skirt Removal and Installation

Step-by-step process for removing and installing side skirts, including torque specifications.

  • Locate and remove all screws, bolts and fasteners securing the side skirts
  • Carefully remove the side skirt
  • When reinstalling, ensure all alignment tabs are correctly seated
  • Install all screws, bolts, and fasteners and torque them to the appropriate specification
View full procedure

Headlight Removal and Installation

Step-by-step process for removing and installing headlights, including torque specifications.

  • Locate and remove all screws, bolts and fasteners securing the headlight assembly
  • Disconnect any electrical connections
  • Carefully remove the headlight
  • When reinstalling, ensure all alignment tabs are correctly seated
  • Reconnect all electrical connections
  • Install all screws, bolts, and fasteners and torque them to the appropriate specification
View full procedure
Technical Service Bulletins

Front Bumper Cover Bolt Corrosion

2017-05-15

Some 2012-2018 models may experience corrosion on the front bumper cover mounting bolts, leading to improper torque application and bumper fitment issues.

2012-2018 BMW 340i

Resolution: Inspect all front bumper cover bolts for corrosion. Replace corroded bolts with new, OEM bolts. Ensure correct torque is applied during reinstallation. Consider using anti-seize compound.

Rear Bumper Cover Alignment Issues

2018-11-20

Reports of rear bumper cover alignment issues and loose fittings are often related to improper torque or damaged mounting clips. This bulletin covers inspection and replacement procedure.

2012-2018 BMW 340i

Resolution: Inspect rear bumper cover mounting points and clips. Replace damaged clips and bolts. Apply correct torque during installation. Check for proper alignment after reassembly.

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.

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