Combination Wrenches: Everything You Need to Know

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A picture of multiple combination wrenches

If you've ever worked on a car, fixed a leaky pipe, or put together furniture, you've probably run into a stubborn nut or bolt. When that happens, reaching for the right tool can make your job a whole lot easier. That tool is often the combination wrench. Simple in design but incredibly useful, this tool is one that every homeowner, mechanic, or DIYer should have in their toolbox. In this blog, we’ll break down everything you need to know about combination wrenches. We explain what they are, how they work, what they’re used for, and how to use them correctly.

What Is a Combination Wrench?

A combination wrench is a hand tool used to tighten or loosen nuts and bolts. What makes it different from other wrenches is that it has two different ends. One side has an open-end, shaped like the letter U. The other side has a closed, ring-shaped end called a box-end.

The open-end is great for getting into tight spots. It lets you slide the wrench onto a bolt quickly without needing to cover the entire head. The box-end fits snugly around a bolt or nut and gives you a better grip, especially if the bolt is really tight or stuck. Having both ends in one tool makes the combination wrench very convenient. You can switch between the two ends depending on the job, without having to grab a different tool.

Someone using a combination wrenches to tighten a bolt

What Is a Combination Wrench Used For?

Combination wrenches are used in many different situations. Their main job is to help turn nuts and bolts, either to tighten or loosen them. Here are some common places where you might use a combination wrench:

Automotive Work

If you’re working on a car, truck, or motorcycle, you’ll probably need a combination wrench. It’s used for things like tightening engine parts, removing battery terminals, and adjusting brackets or clamps.

Mechanical Repairs

In shops and factories, mechanics use combination wrenches every day. They’re handy for machines, engines, and other equipment where bolts need regular adjustments.

Home Repairs and DIY Projects

Combination wrenches are great for fixing things around the house. Whether you’re tightening a loose chair leg or putting together a grill, having a set of these wrenches can save time and effort.

Construction and Assembly

Workers on job sites use combination wrenches to put together framing, scaffolding, and metal structures. The tool helps make sure everything is secure and lined up properly.

How to Use a Combination Wrench

Using a combination wrench is simple, but there are a few things to keep in mind to make the job easier and safer.

Step 1: Pick the Right Size

Combination wrenches come in many sizes. It’s important to pick the one that matches your bolt or nut exactly. If the wrench is too big, it could slip and damage the bolt. If it’s too small, it won’t fit at all. Wrenches are usually labeled in inches (SAE) or millimeters (metric). Make sure you’re using the right system for your fasteners.

Step 2: Choose the Right End

Use the open-end when you need quick access or when the bolt is in a tight spot. The open-end is faster to place and remove. Use the box-end when you need more grip or torque. The box-end surrounds the bolt head, giving you more power and less chance of slipping.

Step 3: Turn the Wrench

To tighten a bolt, turn the wrench to the right. To loosen it, turn to the left. When turning, always pull the wrench toward you rather than pushing it away. This gives you better control and lowers the chance of injury if the wrench slips.

Step 4: Reposition as Needed

Sometimes, especially when using the open-end, you’ll need to reposition the wrench after each turn. Just lift the wrench, rotate it back, and place it again. Repeat this until the bolt is tight or loose.

Someone holding a combination wrench above a car engine

Tips for Using a Combination Wrench

Here are some extra tips to help you get the best results:

Keep your wrenches clean. Dirt and oil can make them harder to grip.
Don’t use a wrench that’s too big or too small for the bolt. It can round off the edges.
Pull the wrench instead of pushing it. It’s safer and gives you more control.
Use the box-end when you need more torque or when working with stubborn bolts.
Store your wrenches in a tool roll or drawer so they’re easy to find.

A combination wrench may look simple, but it’s one of the most useful tools you can own. With both an open-end and a box-end, it gives you speed and power in one tool. Whether you’re fixing a car, building something in your garage, or just tightening a bolt on your bike, this wrench gets the job done. Now that you know what a combination wrench is and how to use it, you’ll be ready the next time a bolt needs turning. At Midland Tool & Supply, we carry a variety of combination wrenches to help you tackle any project. If you are in need of a combination wrench or a combination wrench set, give our sales team a call, at 877-446-4352.