Flatlock Explained

Flatlock is a sewing machine stitch that butts two edges of fabric with no overlap.[1] The flatlock stitch is used on swimwear, active wear, and infant clothing.[2]

Description

It is commonly used in sports wear as there are less fabric to chafe.[1] A similar stitch can be achieved on overlock machines, but the result is thicker as the cloth slightly overlaps.[1] However, some industrial overlock machines can do flatlock stitches.[3] Yamato Sewing Machine Mfg. advertises their interlock sewing machines as "Flatlock/Coverstitch" machines.[4]

While home overlock machines can produce a mock flatlock stitch that is similar to the flatlock of a commercial flatlock machine, it lacks strength because it only contains 3 threads instead of the 6 threads in a true flatlock stitch.[5]

References

  1. Web site: Fasanella . Kathleen . Flatlocking compared to cover stitching and overlocking . Fashion-Incubator . en . 18 February 2009 . 25 May 2025.
  2. Web site: Kiron . Mazharul Islam . Flat Lock Sewing Machine: Parts, Specifications and Working Mechanism . Textile Learner . 25 May 2025 . 12 February 2012.
  3. Web site: Adscultin. Overlock vs. Interlock sewing machine - Balaji Sewing Machine Pvt. Ltd . balajisewing.com . Balaji Sewing Machine pvt ltd . 29 February 2024.
  4. Web site: Interlock Sewing Machines (Flatlock Machines) Products . Yamato Sewing Machine Mfg. Co., Ltd. . Yamato Sewing Machine Mfg. Co., Ltd. . 25 May 2025 . en. .
  5. Web site: Lombardi . Alex . Q&A: Real vs. Mock Flatlock . Threads . Active Interest Media . 25 May 2025 . 26 June 2019.

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