What size are rim bolts?

There isn’t a single universal size for rim bolts. The correct size depends on the vehicle and wheel hardware; most modern passenger cars use metric lug-thread sizes around M12 or M14 with lug nuts that typically require a 19 mm or 22 mm wrench.

In practice, the size refers to the thread diameter and pitch (for example M12x1.5 or M14x1.5), as well as the hex size of the nut or bolt used to secure the wheel. This article explains common sizes and how to verify the right one for your vehicle, along with practical steps for safe installation.

Understanding what determines rim bolt size

The size of rim bolts (or lug bolts and lug nuts) is determined by several factors: the thread diameter and pitch, the seat type that the wheel requires, the bolt pattern on the hub, and the center bore alignment. Because these specifications are model-specific, it’s essential to check your vehicle’s manufacturer’s guidance or inspect the existing hardware to ensure a proper fit and safe torque values.

Common metric thread sizes you may encounter

The following sizes cover the most frequent cases on modern cars, SUVs, and light trucks. Use this as a reference, but always confirm with the vehicle’s official specs.

• M12 x 1.5 — very common on passenger cars; lug nuts typically require a 19 mm wrench.


• M12 x 1.75 — used on some light trucks and SUVs; lug nuts typically require a 19 mm wrench.


• M14 x 1.5 — common on many European cars and some SUVs; lug nuts typically require a 22 mm wrench.

Note: There are exceptions and variations by model and market. Always verify the exact thread size and pitch for your vehicle before purchasing or replacing wheel fasteners.

Seat types and what they mean for you

Wheel fasteners come in different seat designs (for example conical/60-degree, ball-seat, or flat seats). The seat type must match the wheel to ensure proper seating and load distribution. While the thread size determines the fit, using the correct seat type is essential for safety and wheel integrity.

Vehicle-specific specs

Consult the owner's manual, the vehicle manufacturer’s online spec sheet, or a dealership to confirm the exact lug-thread size, pitch, and seat type for your car. If you’re working with aftermarket or wheels from a different vehicle, verify compatibility with both the wheel and hub.

How to verify the correct size for your vehicle

Use a straightforward verification checklist to avoid mismatches. Start with the vehicle’s official specifications, then cross-check the hardware you have on hand.

1. Check the owner’s manual or the manufacturer’s website for wheel hardware specs (thread size, pitch, seat type).


2. Inspect existing lug bolts or lug nuts for diameter, pitch indicators, and seat shape.


3. Measure with a caliper or thread gauge if you have access to the hardware; compare to typical sizes (e.g., M12x1.5 or M14x1.5).


4. Ensure the hub pattern and center bore match the wheel you are installing.


5. Torque the fasteners to the manufacturer’s specification and re-check after a short drive.

Following these steps helps ensure you select the correct fasteners and avoid wheel damage or safety risks.

Summary

Rim bolt size is not universal. The most common modern sizes are M12x1.5 and M14x1.5, with lug-nut wrench sizes typically 19 mm and 22 mm, respectively. Always verify your exact vehicle specifications and wheel compatibility before purchase or installation, and torque correctly to the recommended value. If in doubt, consult a professional to ensure a safe fit.

How to find out wheel bolt size?

Most manuals will specify the size and type of lug nuts required for the vehicle. But if you don't have access to your owner's manual, you can check the side of the wheel nut to see if the size is imprinted on it.

What size are lug bolts?

Lug bolt sizes consist of a thread size (diameter and pitch, like 12mm×1.512 m m cross 1.512𝑚𝑚×1.5) and a length, with common metric sizes being 10mm10 m m10𝑚𝑚, 12mm12 m m12𝑚𝑚, and 14mm14 m m14𝑚𝑚 and common SAE sizes including 7/16"7 / 16 "7/16", 1/2"1 / 2 "1/2", and 9/16"9 / 16 "9/16". The specific size you need depends on your vehicle, and it's crucial to get the correct size and pitch to ensure the wheel is securely fastened.
 
This video explains how to identify the correct lug nut size for your vehicle: 53sSubiSpeedYouTube · Jan 28, 2020
Common sizes

• Metric:
  • 10mm×1.2510 m m cross 1.2510𝑚𝑚×1.25 
  • 12mm×1.2512 m m cross 1.2512𝑚𝑚×1.25 
  • 12mm×1.512 m m cross 1.512𝑚𝑚×1.5 
  • 12mm×1.7512 m m cross 1.7512𝑚𝑚×1.75 
  • 14mm×1.2514 m m cross 1.2514𝑚𝑚×1.25 
  • 14mm×1.514 m m cross 1.514𝑚𝑚×1.5 
  • 14mm×2.014 m m cross 2.014𝑚𝑚×2.0 
• SAE (Imperial):
  • 7/16"×207 / 16 " cross 207/16"×20 
  • 1/2"1 / 2 "1/2" 
  • 9/16"9 / 16 "9/16" 
  • 5/8"5 / 8 "5/8" 

This video demonstrates how to measure a bolt pattern: 57sHow to AutomotiveYouTube · Feb 26, 2022
What to consider

• Thread size and pitch: You must match both the diameter and the thread pitch (e.g., 12mm×1.512 m m cross 1.512𝑚𝑚×1.5). Using the wrong pitch can cause the bolt to not engage properly. 
• Bolt length: Ensure the bolt is long enough. A general rule of thumb is that about 17mm17 m m17𝑚𝑚 of the bolt should be sticking out the back of the wheel for proper and secure mounting, though the exact length needed depends on the wheel's thickness, notes this YouTube video. 
• Correct fit: It is critical to use the correct lug bolt size for your vehicle. Using different sizes on the same wheel can lead to uneven pressure and can cause the wheel to come off. 
• How to find your size:
  • Check your vehicle's owner's manual. 
  • Use a dial or digital caliper to measure the diameter of the stud. 
  • Look for markings on an existing lug nut. 
  • Take one of your lug nuts to an auto parts store to have it matched. 
  • Use an online guide or enter your vehicle's year, make, and model on an auto parts website. 

What size are standard wheel bolts?

The three most common hex sizes for lug nuts are 17 mm, 19 mm, and 21 mm, while 22 mm, 23 mm, 11⁄16 inch (17.5 mm), and 13⁄16 inch (20.6 mm) are less commonly used.

How do I know the bolt size on my rims?

Lug. If that number is odd you're going to measure from the center of one lug to the outer edge of one of the opposite. Lugs. Now some bolt patterns are measured in millimeter.