Socket Size Chart

Whether you’re a DIY enthusiast or a professional mechanic, the right tools are crucial. Socket sets, with their myriad sizes, are indispensable. Yet, navigating these sizes can be daunting. Fear not! This ultimate socket size chart guide simplifies the process, helping you choose confidently. We’ll explore tradeoffs, and challenges, and emphasize the importance of considering impacts when selecting socket sizes. Let’s master socket sizing together!

Metric Socket Sizes Chart

3/8″ Drive1/4″ Drive3/4″ Drive1/2″ Drive
19mm 33mm22mm
20mm 34mm23mm
21mm 35mm24mm
22mm 36mm25mm

SAE Socket Sizes Chart

3/8″ Drive1/4″ Drive3/4″ Drive1/2″ Drive
15/16″ 1-5/8″7/8″
1″ 1-11/16″15/16″

SAE to Metric Conversion Chart

SAE SizeMetric SizeInches Decimal 
5/32″ 0.1565/32″ and 4mm are
 4mm0.157close enough
3/16″ 0.188 
7/32″ 0.219 
1/4″ 0.25 
9/32″ 0.281 
5/16″ 0.3135/16″ and 8mm are
 8mm0.315close enough
11/32″ 0.344 
3/8″ 0.375 
13/32″ 0.406 
 11mm0.4337/16″ and 11mm are
7/16″ 0.438close enough
15/32″ 0.46915/32″ and 12mm are
 12mm0.472close enough
1/2″ 0.5 
17/32″ 0.531 
9/16″ 0.563 
 15mm0.59119/32″ and 15mm are
19/32″ 0.594close enough
5/8″ 0.625 
21/32″ 0.656 
11/16″ 0.688 
23/32″ 0.719 
 19mm0.7483/4″ and 19mm are
3/4″ 0.75close enough
25/32″ 0.781 
13/16″ 0.813 
27/32″ 0.844 
7/8″ 0.875 
 23mm0.90629/32″ and 23mm are
29/32″ 0.906close enough
15/16″ 0.938 
1″ 1 

Understanding Socket Sizes

Transitioning from selecting a socket size to using it effectively requires understanding the intricacies of socket sizing. Active voice guides us through this crucial step, illuminating how socket sizes are measured and why they differ. Delving into the basics, we’ll uncover the various measurements used, setting the stage for informed decisions.

We’ll also navigate the tradeoffs and challenges inherent in balancing factors like precision and versatility, emphasizing the significance of considering impacts when consulting the Socket Size Chart.

Metric vs. Imperial Socket Sizes

“Transitioning from understanding socket sizing to selecting the right system requires clarity on the metric versus imperial debate. Here, active voice guides us through exploring the differences between these two systems and when each finds common use. By navigating these distinctions, we equip ourselves to make informed decisions amidst the diverse array of sockets available.

Along the way, we’ll discuss the tradeoffs and challenges inherent in choosing between metric and imperial measurements, emphasizing the importance of considering the impact on our Socket Size Chart selections.”

Common Socket Size Chart

Transitioning from understanding the differences between metric and imperial measurements to practical application, we now unveil a comprehensive socket size chart. Active voice propels us through this section, where we detail the most common socket sizes alongside their corresponding metric and imperial measurements. Whether you’re tackling automotive repairs, bike maintenance, or household projects, this chart becomes your indispensable reference.

Alongside this, we’ll explore the tradeoffs in selecting socket sizes for various tasks and discuss the challenges associated with different approaches, underscoring the significance of considering the impact on our Socket Size Chart decisions.

Specialty Socket Sizes

Transitioning from the realm of common socket sizes, we now delve into the world of specialty sockets tailored for specific tasks. Active voice guides us as we shine a light on these specialized tools and their unique applications. From spark plug sockets to impact sockets, this section unveils the array of options available.

Along the way, we’ll explore the tradeoffs inherent in choosing specialty sockets, balancing factors like precision and versatility. Additionally, we’ll navigate the challenges associated with different approaches, highlighting the importance of considering the impact on our Socket Size Chart selections.

Choosing the Right Socket Size

Transitioning from exploring specialty socket sizes, we now confront the challenge of choosing the right one for the task at hand. Active voice propels us as we provide practical tips and considerations to streamline the selection process. From balancing factors like size and compatibility to considering the specific requirements of your project, we’ll navigate the tradeoffs involved in selecting the perfect socket size.

Additionally, we’ll address the challenges that may arise with different approaches, emphasizing the importance of efficiency and precision in our Socket Size Chart decisions, and the impact they have on the overall outcome of our projects.

Tips for Maintaining Socket Sets

Transitioning from the selection and use of socket sizes, we now turn our attention to the crucial aspect of maintenance. Active voice guides us as we emphasize the importance of proper care in prolonging the lifespan and ensuring optimal performance of your socket set. In this final section, we’ll delve into valuable tips and techniques for cleaning, storing, and organizing your sockets.

By balancing factors like frequency of use and storage conditions, we’ll explore the tradeoffs involved in maintaining your socket set. Additionally, we’ll address the challenges that may arise, underscoring the impact of maintenance on the longevity and functionality of your tools, and how this consideration ties back to your decisions made on the Socket Size Chart.


Transitioning from exploring socket sizes and maintenance, this guide equips you with confidence. Active voice underscores the importance of understanding socket sizes for success in your endeavors. Reflecting on tradeoffs and challenges, we emphasize considering the impact when consulting the Socket Size Chart. Armed with this knowledge, grab your socket set, and embark on your next project with unwavering ease and confidence!


Q: How do I know which socket size to use for a specific bolt or nut?

Refer to the Socket Size Chart provided in this guide, which lists common socket sizes along with their corresponding metric and imperial measurements. Additionally, you can use trial and error by testing different socket sizes until you find the one that fits snugly without any play.

Q: Can I use a metric socket on an imperial bolt, or vice versa?

A: While it’s possible in some cases to use a metric socket on an imperial bolt, it’s not recommended. Using the wrong socket size can lead to rounding off the bolt or damaging the socket. It’s best to use the correct socket size to ensure a secure and safe fit.

Q: How should I clean and maintain my socket set?

A: To maintain your socket set, regularly clean them with a degreaser and a wire brush to remove any dirt, grease, or rust. After cleaning, dry them thoroughly and store them in a clean and dry toolbox or organizer to prevent corrosion. Additionally, lubricate the sockets periodically to keep them operating smoothly.

Q: What are some common specialty sockets, and when should I use them?

A: Specialty sockets include spark plug sockets, impact sockets, and universal joints, among others. Spark plug sockets are designed specifically for removing and installing spark plugs, while impact sockets are built to withstand the high torque generated by impact wrenches. Universal joints allow sockets to be used at different angles, providing versatility in tight spaces.

Q: How can I ensure I’m choosing the right socket size for my project?

A: Consider the size and type of fastener you’re working with, as well as the torque requirements of your project. Consult the Socket Size Chart provided in this guide to find the appropriate socket size based on metric or imperial measurements. Additionally, trial and error can be used to confirm the correct fit before applying torque.