Best Sewing Thread for Denim – Sewing

Let’s be real—there’s nothing worse than putting time into sewing or repairing denim, only to have the thread snap the first time you wear it. Whether you’re patching jeans, making a denim jacket, or crafting a sturdy tote bag, using the wrong thread is a recipe for frustration.

After testing dozens of threads (and making plenty of mistakes along the way), I’ve narrowed down the best threads for denim—ones that won’t break, fray, or fade after a few washes. Plus, I’ll share some pro tips to make your denim projects last longer.

What Makes Denim Thread Different?

Denim isn’t your average fabric—it’s thick, tough, and gets a lot of wear. That means you need thread that can handle:
 Heavy stitching (like seams and topstitching)
 Constant friction (denim rubs against itself)
?Repeated washing (without fading or weakening)

Regular all-purpose thread? Not gonna cut it. You need something stronger and more durable.

The Best Threads for Denim (Tested & Approved)

**1. Coats & Clark Dual Duty XP Heavy – Best All-Around Thread

• Why I Love It: This polyester/cotton blend is strong but slightly stretchy, so it won’t snap when denim moves. It’s also lint-free, meaning it won’t gunk up your sewing machine.

• Best For: General denim sewing, repairs, and tote bags.

• Pro Tip: Use a 90/14 needle for best results.

**2. Gütermann Mara 70 – Best for Sewing Machines

• Why I Love It: This 100% polyester thread is smooth, strong, and resists fraying. It’s a favorite among quilters and denim sewists because it glides through machines without breaking.

• Best For: Topstitching, sewing thick denim layers, and heavy-duty projects.

• Pro Tip: If your machine keeps skipping stitches, try adjusting the tension slightly looser.

**3. Rex Heavy Duty Polyester Thread (Tex 70) – Best for Industrial Strength

• Why I Love It: This stuff is thick and nearly unbreakable—perfect for reinforcing seams on workwear or heavy denim jackets.

• Best For: Jeans repairs, belt loops, and areas that get a lot of stress (like crotch seams).

• Pro Tip: Works best with a 100/16 needle.

**4. Hand Stitching Waxed Thread – Best for Repairs by Hand

• Why I Love It: If you’re fixing jeans by hand, waxed thread (like Speedy Stitcher) is a game-changer. The wax coating prevents fraying and makes the thread stronger.

• Best For: Reinforcing buttonholes, patching ripped knees, or adding decorative stitching.

• Pro Tip: Use a curved upholstery needle for easier hand-sewing.

**5. American & Efird Serger Thread – Best for Finishing Seams

• Why I Love It: If you’re using a serger to finish raw denim edges, this polyester thread won’t break or lint up your machine.

• Best For: Overlocking denim seams to prevent fraying.

• Pro Tip: Pair it with a denim serger needle for smoother stitching.

Thread Shopping Cheat Sheet

Bonus: How to Prevent Thread Problems

• Use the right needle (denim/jeans needles are a must).

• Loosen tension slightly—denim is thick and needs flexibility.

• Double-stitch high-stress areas (like pockets and belt loops).

• Wash denim inside out to protect thread color.

If you’re working with denim, don’t cheap out on thread—it’s the backbone of your project! For most people, Coats & Clark Dual Duty XP or Gütermann Mara 70 will cover all your needs. But if you’re doing heavy repairs, Rex Tex 70 or waxed thread will save the day.

What’s your go-to denim thread? Have a favorite brand I missed? Let me know in the comments!