Sewing Machine Thread Tension: Don't Get All Wound Up!

We've all been there.

You're sewing along, everything seems to be going just fine, and then you turn your fabric over. Suddenly, you're looking at loose stitches, loops of thread, or maybe even a little bird's nest underneath.

Or perhaps your fabric is puckering, your thread keeps breaking, or your stitches just don't look quite right.

Sound familiar?

Before you start turning dials, changing settings, or threatening to throw your sewing machine out the window... 😂

Let's talk about thread tension.

It's one of those things that can seem a little intimidating, especially when you're not quite sure what all those numbers mean or which direction to turn the dial.

But understanding a few basics about how thread tension works—and knowing what to check before making adjustments—can save you a whole lot of frustration.

What Is Sewing Machine Thread Tension, Anyway?

In simple terms, thread tension is the balance between the upper thread and the bobbin thread as they come together to form a stitch.

Ideally, those threads meet within the layers of fabric, creating a balanced stitch that looks good on both sides.

When that balance is off, you might notice loops, loose stitches, puckering or one thread being pulled through to the opposite side.

And while those problems can certainly involve tension, here's something important to remember:

Not every stitching problem is a tension problem.

Sometimes the solution is much simpler than you think.

Before You Touch That Tension Dial...

When my stitches aren't behaving, I like to start with the simple things.

Check your threading.

It sounds almost too obvious, but an improperly threaded machine can cause all kinds of problems.

Try removing the upper thread and rethreading the machine completely, following your machine's instructions. Make sure the presser foot is raised while threading so the thread can seat properly between the tension discs.

Check your bobbin.

Is it inserted correctly? Is the thread feeding in the proper direction? Is the bobbin wound evenly?

Sometimes removing and reinserting the bobbin is all it takes.

Take a look at your needle.

A bent, dull or incorrectly installed needle can cause stitching problems that look suspiciously like tension issues.

And don't forget to make sure you're using a needle appropriate for your thread and fabric.

Clean your machine.

We all know we're supposed to clean our sewing machines regularly. But let's face it...when we're in the middle of a project and everything is going smoothly, stopping to clean the

machine isn't exactly at the top of our list. 😂

The trouble is, lint and stray threads have a way of building up around the bobbin area, and sometimes that buildup can contribute to stitching problems.

Before you start adjusting your tension settings, take a few minutes to give your machine a little TLC. You might be surprised how often a simple cleaning, following your machine's instructions, can help get things stitching smoothly again.

Okay, Now Let's Look at Those Stitches

You've rethreaded your machine, checked the bobbin, inspected the needle and maybe even given your machine a much-needed cleaning.

But something still isn't quite right.

Now it's time to take a closer look at what your stitches are telling you.

Are you seeing loose loops underneath your fabric? That can be a sign that your upper thread isn't under enough tension or hasn't been threaded correctly.

Is your bobbin thread showing on the top of your fabric? Your upper thread tension may be too tight, pulling the bobbin thread up through the fabric.

These are good clues about what might be happening, but they aren't always a definite answer.

That's why I like to eliminate the simple possibilities before I start adjusting settings. There's nothing quite like spending twenty minutes fiddling with your tension dial only to discover the thread wasn't properly seated in the first place. 😂

Turning the Dial: More Tension or Less?

On most domestic sewing machines, adjusting the upper thread tension is as simple as turning a numbered dial or changing a setting on the machine's screen.

The important thing to remember is:

• Lower number = less upper thread tension. The upper thread is allowed to feed more freely.

• Higher number = more upper thread tension. The machine applies more resistance to the upper thread as it feeds through.

For example, if your tension is set at 4 and you change it to 3, you're decreasing the upper thread tension. Moving from 4 to 5 increases it.

But how do you know which direction to go?

If the upper thread is being pulled too tightly, causing the bobbin thread to show on top of your fabric, you may need to decrease the upper tension.

If the upper thread is too loose and you're seeing it pulled to the underside of your fabric, you may need to increase the upper tension.

Remember, though, loose loops underneath can also mean the machine isn't threaded correctly. Always check that first!

And one important note: Every sewing machine is a little different. Some have automatic tension controls, and the recommended settings and adjustment methods can vary. Always consult your sewing machine's manual for instructions specific to your model.

Make small adjustments, test your stitches and change only one thing at a time.

And unless your machine's instructions specifically call for it, leave that little bobbin tension screw alone. 😉Make Small Adjustments

Once you've checked the threading, bobbin, needle and machine cleanliness, it may actually be time to adjust the tension.

And that's okay!

Your sewing machine has adjustable tension for a reason.

Different fabrics, thread weights and batting combinations can sometimes require different settings.

But make changes gradually.

Adjust the upper tension a little at a time, then sew another test seam.

Pay attention to whether the stitches improve or get worse.

And remember where you started so you can return to your original setting if necessary.

For most everyday piecing, I would leave the bobbin tension alone unless your machine's manual recommends adjusting it or you know what you're doing.

Test Before You Sew

This is one habit that can save a lot of aggravation.

Before starting a new project—especially if you're changing thread, needle type or fabric—sew a few test seams.

Use scraps of the same fabric you'll be working with, preferably with the same number of layers.

Check the stitches on both sides.

If you're quilting through batting and backing, make a small test sandwich using those materials.

It's much easier to correct a problem on a scrap than discover it halfway through a quilt.

And if you do need to make adjustments, that test piece gives you somewhere to experiment without worrying about your actual project.

Don't Let Frustration Take Over

Sometimes the biggest tension problem isn't in the sewing machine.

It's in the quilter. 😂

You've rethreaded the machine.

You've checked the bobbin.

You've sewn three test seams.

And you're getting more frustrated by the minute.

That's usually when it's time to walk away for a little while.

Take a break. Stretch your shoulders. Get a fresh cup of coffee.

Then come back and work through the problem one step at a time.

Because randomly changing three settings at once usually makes it harder to figure out what actually fixed the problem

.

And sometimes a little patience is the most useful tool in the sewing room.

A Little Understanding Goes a Long Way

Thread tension doesn't have to be mysterious.

You don't need to become a sewing-machine technician to recognize when your stitches aren't balanced.

Start with the basics.

Check your threading, bobbin and needle.

Keep your machine clean.

Test your stitches.

And when adjustments are needed, make them one at a time.

The more familiar you become with your machine, the easier it gets to recognize when something isn't quite right.

And the next time you turn your fabric over and find a mess of thread underneath?

Don't panic.

Take a look, take your time and don't let the tension make you tense. 😉

Keep This Checklist Handy!

Even experienced quilters run into tension troubles now and then. And when your stitches aren't cooperating, sometimes a simple reminder is all you need.

I've created a FREE Thread Tension Troubleshooting Checklist you can print and keep right beside your sewing machine. It's a quick, step-by-step reference to help you work through common stitching problems without getting all wound up!

Enter your name and email address below, and I'll send a copy your way.

You'll also have the option to Join the Circle for more Quilt Confidence tips, quilting inspiration, and updates from A Ribbon Run Thru It.

No subscription necessary. Just a little help when you need it!

Send Me My Free Checklist