Best thread for sewing leather: polyester or nylon (complete guide)

Best thread for sewing leather: polyester or nylon (complete guide)

Choosing the wrong thread can ruin a piece that has taken you hours of work. That is why selecting the right material for the seams is just as important as the leather itself.

In this guide, we explain which thread to use for sewing leather, comparing polyester and nylon thread so you can achieve a professional and durable finish.

Quick answer: For most leatherwork, waxed polyester thread is the best choice due to its durability and stability. Nylon is recommended for pieces that require some elasticity or are subject to tension.

Polyester vs Nylon: Quick Comparison

Why waxed polyester thread is the artisans' favorite

The waxed polyester thread has established itself as the standard in leather workshops. Its main advantage is that it does not stretch or fray with use.

Furthermore, being waxed polyester thread, the wax facilitates sliding through the leather and helps seal the stitch.

Strength and thickness: Ideal uses of 1mm thread

For projects such as bags, backpacks, or footwear, 1mm waxed polyester thread offers great resistance and a more pronounced aesthetic in the seam.

Waxed nylon thread: Advantages and when to use it

The waxed nylon thread stands out for its tensile strength and slight elasticity.

Unlike polyester, waxed nylon thread can better absorb tugs without breaking, making it ideal for straps or pieces subject to stress.

Wax finish: Key to sewing quality

A good waxed thread must maintain tension, facilitate sewing, and allow for a clean finish when sealing the ends.

What thread to use according to the type of project

• Wallets and small leather goods: polyester 0.6mm – 0.8mm
• Bags and backpacks: polyester 0.8mm – 1mm
• Straps or pieces subject to tension: waxed nylon

Durability comparison: which thread resists better?

If you are looking for maximum durability, waxed polyester thread is usually the best option.

Its resistance to UV rays and mildew makes it a more stable long-term alternative, especially for daily-use products.

If you are interested in leather maintenance, you can also read:
How to safely remove mold from leather

Essential tools for hand sewing leather

• Blunt needles: Avoid damaging the thread
• Stitching punches: Allow for marking uniform stitches
• Awl or punch: Facilitates passing the thread through thick leather

You can see all the tools here:
View leather tools

Frequently asked questions about waxed thread

Can waxed thread be used in a sewing machine?
It is not recommended, as the wax can damage the machine's mechanism.

What thickness is best for a wallet?
It is most common to use 0.6mm or 0.8mm thread for a finer finish.

Buy waxed threads for leather

At Curtidos Cabezas you will find a selection of threads designed for artisanal work, with different thicknesses and materials.

Access directly here:

See threads for sewing leather