What Size Are the Lug Nuts on a 2013 BMW 328i?

The 2013 BMW 328i uses wheel fasteners with an M14 x 1.25 thread size, a 17 mm hex head, and typically a 28 mm–30 mm shank length, but it uses lug bolts, not traditional lug nuts. In practical terms, you’ll need a 17 mm socket for removal/installation and replacement wheel bolts that match M14 x 1.25 thread specifications.

Understanding the Wheel Fasteners on a 2013 BMW 328i

The question about “lug nut size” on a 2013 BMW 328i is slightly misleading, because BMW traditionally uses lug bolts instead of exposed lug nuts with wheel studs. For owners, technicians, and DIY enthusiasts, what matters most are three key dimensions: the thread size, the pitch, and the hex size used to remove and install the bolts.

The Exact Sizes You Need to Know

Thread Size and Pitch

The critical specification for safely securing the wheels is the thread size and pitch, which must match the hub.

The main thread specifications for the 2013 BMW 328i (F30 generation) are:

This list breaks down the key dimensional specs of the factory wheel bolts so that you can identify compatible replacements or use the correct tools.

• Thread diameter: M14 (14 mm)
• Thread pitch: 1.25 (fine-thread, M14 x 1.25)
• Bolt type: Lug bolt (not a lug nut on a stud)
• Typical shank/length: Around 28–30 mm for OEM-style bolts (length can vary with aftermarket wheels or spacers)

Together, these measurements define the bolt that threads into the hub, and any replacement must match these specs exactly to ensure correct engagement and clamping force.

Hex (Socket) Size

While the thread size describes the part that screws into the hub, the hex size tells you what tool fits on the bolt head.

The usual tool-related dimensions for the 2013 BMW 328i are:

This list covers the tool sizes and styles you’ll need when changing wheels or performing brake work on a 2013 BMW 328i.

• Hex head size (socket size): 17 mm
• Recommended socket type: 1/2″ drive, 17 mm six-point socket
• Wheel lock key (if equipped): BMW locking bolts require the matching keyed adapter supplied with the vehicle

Using the correct 17 mm socket helps prevent rounding the bolt heads and ensures proper torque can be applied during tightening.

OEM Lug Bolt Style and Seat Type

Correct seat design is as important as thread size; the wrong seat can damage wheels or loosen over time.

For the 2013 BMW 328i, the typical factory bolt characteristics include:

This list outlines the physical shape and mating surface of OEM-style lug bolts, which must match your wheel’s design.

• Seat type: Conical (tapered) on most OEM F30 wheels
• Finish: Usually zinc-coated or black-finished steel
• Head style: Standard hex head bolt, sometimes with integrated washer-style flange

Matching the seat type (conical vs. ball/radius) to the wheel is crucial; using the wrong seat can lead to poor centering, loosening, or damage to the wheel’s mounting holes.

Torque Specifications and Installation Notes

Factory Torque Spec

Knowing the proper torque setting is just as important as using the correct bolt size.

For a 2013 BMW 328i, widely referenced service data indicates the following:

This list summarizes the important tightening and installation considerations when working with the wheel bolts.

• Wheel bolt torque: Approximately 120 Nm (about 88–90 lb-ft)
• Tightening pattern: Star pattern across the wheel to seat it evenly
• Re-check torque: Recommended after about 50–100 miles following wheel changes, especially with new wheels or spacers

Adhering to the correct torque and tightening sequence helps prevent warped brake rotors, vibration, and uneven clamping of the wheel.

When You Might Need Different Lug Bolts

Aftermarket Wheels and Spacers

While the factory 2013 BMW 328i uses M14 x 1.25 bolts with a 17 mm hex and conical seats, aftermarket setups can change what you need.

Common situations requiring non-stock bolts include:

This list explains when the standard bolt dimensions may need to be changed and what factors influence those decisions.

• Wheel spacers: Require longer bolts, but still M14 x 1.25 thread, with extra length equal to the spacer thickness
• Aftermarket wheels with different seats: Some use ball/radius seats instead of conical, requiring matching-seat bolts
• Different bolt head style: Some aftermarket bolts use different head shapes or finishes but must retain M14 x 1.25 threads

Even when changing length or seat type, the thread size (M14 x 1.25) and proper engagement in the hub must never be altered, as this directly affects safety.

How to Confirm the Correct Size for Your Specific 328i

Model Variants and Market Differences

The 2013 BMW 328i comes in several trims and configurations (sedan, xDrive, different wheel packages), but the wheel bolt thread size is generally consistent across F30 3 Series models of this era.

To double-check what fits your particular car, you can use the following approaches:

This list presents reliable ways to verify your wheel fastener specifications before ordering parts or doing DIY work.

• Owner’s manual: Often lists wheel and tire specifications and may reference torque values
• Dealer parts counter: Provide VIN and ask for OEM wheel bolt specifications
• Trusted parts catalogs: Reputable online BMW parts sites allow lookup by year, model, and trim
• Existing bolt inspection: A shop can measure thread and length if you bring in one of your bolts

Confirming with VIN-based data ensures you account for any market-specific variations or previous modifications to your car’s wheels or hubs.

Summary

The 2013 BMW 328i does not use traditional lug nuts but rather lug bolts. The standard bolt specification is M14 x 1.25 thread with a 17 mm hex head, and a typical OEM length in the 28–30 mm range, usually with a conical seat. For practical purposes, you’ll need a 17 mm socket and should tighten the bolts to about 120 Nm (88–90 lb-ft). Any replacement or aftermarket hardware must match the M14 x 1.25 thread and correct seat type to ensure safe, secure wheel mounting.

What is the bolt pattern on a 2013 BMW 328i?

The lug pattern for a 2013 BMW 328i is 5×120, which means it has 5 lug holes and a bolt circle diameter of 120mm. This pattern is consistent with other BMW 3 Series models from the 2008-2013 production years.
 

• Lug Pattern: 5×120
• Center Bore: 72.6mm
• Thread Size: M12 x 1.5
• Common Wheel Offsets: ET30 to ET45

What size are the lug nuts on a BMW 328i?

The BMW 328i lug nut size varies by model year, but most models use either an M12 x 1.50 or M14 x 1.25 thread size. Newer models with original equipment wheels use M12 x 1.50, while aftermarket wheels may require M14 x 1.25, so it’s crucial to verify the correct size for your specific vehicle and wheel type. 
Common lug nut sizes for the BMW 328i

• M12 x 1.50: Used for many E-chassis models (e.g., 2007-2013). 
• M14 x 1.25: Used for many F and G-chassis models, especially with aftermarket wheels or wheel spacers. 

How to confirm the correct size

• Check your owner’s manual: This is the most reliable source for the correct specifications.
• Inspect your existing lug nuts: Look for the thread size stamped on them.
• Check your wheel manufacturer’s guide: If you have aftermarket wheels, the manufacturer’s specifications will be the most accurate.
• Consult a parts store or your dealership: They can look up the exact specifications based on your vehicle’s year, make, and model. 

Important considerations

• Wheel spacers: If you are using wheel spacers, you will need longer bolts or studs to accommodate the additional thickness. 
• Bolt vs. nut: Some BMWs use wheel bolts instead of lug nuts. Make sure you are purchasing the correct part for your vehicle. 
• Torque specifications: Always follow the manufacturer’s recommended torque specifications for proper installation. 

What size socket for BMW lug nuts?

The most common socket size for BMW lug nuts is 17mm. However, some older or specific models may use a different size, so it’s best to confirm with your vehicle’s manual or by checking the lug nut head directly. 

• Standard size: The standard socket size for most modern BMWs is 17mm. 
• Confirm your size: Before starting, check your owner’s manual to confirm the exact lug nut size for your specific vehicle. 
• Socket type: Use a 6-point socket rather than a 12-point to prevent rounding the lug nut. 
• Protection: To avoid scratching the wheels, use a protective socket with a plastic sleeve or wrap the socket with tape and felt. 
• Torque wrench: When re-installing the wheels, use a torque wrench to tighten the lug nuts to the manufacturer’s specified torque, which is typically around 88 lb.ft +/-10% for BMWs. 

What size are BMW 3 Series wheel nuts?

There are two main thread sizes common on BMW: M12x1. 5 and M14x1. 25.