What Is Flat Locking?

Flat locking is a technique used in sewing and serging to create a strong, durable, and professional-looking finish. It involves joining two pieces of fabric together with a flat seam, resulting in a smooth and flat surface that’s both comfortable and aesthetically pleasing. To achieve this seamless look, it’s essential to use high-quality thread that can withstand frequent washes and strain. Whether you’re a professional seamstress or a DIY enthusiast, investing in this top-quality thread is guaranteed to elevate your sewing projects to a whole new level.

Is Flatlock the Same as Coverstitch?

Flatlocking refers to a specific type of seam that’s commonly used in the garment industry. It’s also a popular technique among sewists and quilters.

While coverstitching and flatlocking are similar techniques, they aren’t the same. Coverstitching involves stitching a double line of stitches on the top side of the fabric, while a single line of stitches is seen on the underside. This technique is commonly used for hemming, edge stitching, and attaching trims.

It’s commonly used in activewear, swimwear, and sportswear, as it allows for maximum comfort and movement. The seams created by flatlocking are durable and stretch with the fabric, making it ideal for garments that require flexibility.

Madeira Aerolock Premium Serger thread is a top-quality thread specifically designed for sergers/overlock and coverlock machines, such as the Janome CoverPro family of machines. It’s made of 100% core-spun polyester, which ensures it’s longevity even with frequent washes or strain.

Choosing the right thread is essential when working with sergers and coverlock machines. It’s core-spun construction ensures that the thread remains strong and resistant to breakage, even when subjected to tension and stretching during the sewing process.

So, if you want your garments to have a professional finish and excellent longevity, consider using Madeira Aerolock Premium Serger thread.

Different Types of Sewing Techniques: Exploring the Differences Between Flatlocking, Coverstitching, and Other Commonly Used Techniques in Sewing.

Flat locking is a type of sewing technique that’s commonly used in garment construction. It involves sewing two pieces of fabric together with a series of parallel lines, creating a flat and secure seam. This technique is often used on activewear and sportswear, as it provides a flexible and durable finished seam that can withstand high levels of stress and stretching.

Coverstitching, on the other hand, is a sewing technique that’s used to create neat and professional-looking hems and decorative stitches. It involves using a specialized sewing machine with multiple needles and a looper to create a double line of stitching on the top of the fabric, while forming a neat row of loops on the underside of the fabric. Coverstitching is commonly used in jersey knit fabrics, as it offers stretch and durability while maintaining a clean and finished appearance.

There are also other commonly used sewing techniques, such as straight stitching, zigzag stitching, and serging. Straight stitching is the most basic sewing technique and is used for joining fabric pieces together with a straight line of stitches. Zigzag stitching is used to finish raw edges, prevent fraying, and add decorative touches. Serging, or overlocking, is a technique used to sew and finish fabric edges simultaneously, creating a professional and clean finish.

Understanding the different sewing techniques, including flat locking, coverstitching, and others, allows you to choose the right technique for your sewing project, ensuring a high-quality and professional-looking finished garment.


Madeira Aerolock offers superior strength and durability, making it perfect for sergers and overlock machines. It’s core-spun polyester composition ensures that the thread can withstand frequent washes and strain, guaranteeing a long-lasting finish. Whether you’re a professional sewer or a hobbyist, investing in high-quality thread like Madeira Aerolock is essential for achieving professional and durable results in your flat locking projects. So, next time you embark on a sewing project that requires flat locking, trust Madeira Aerolock for a seamless and reliable outcome.

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