What is the purpose of knotting or finishing threads at the end of a seam?

• A. To decorate the seam.
• B. To shorten the seam length.
• C. To prevent fraying at the seam ends.
• D. To secure the stitch and prevent unraveling during deployment.

Answer: (D)

Finishing threads at the end of a seam creates a locked end so the stitch can’t pull out under load. In high-stress situations like deployment, the fabric and seam endure movement, vibration, and tension; if the thread ends aren’t secured, the stitches can unravel and the seam fail. Knotting or tying off the end ties the thread off to itself, preserving the seam’s integrity and keeping the fabric together when it matters most. While decorating or shortening the seam aren’t the goals of finishing, and preventing fraying at the very edge is related to edge finishing, the primary purpose here is to stop unraveling the seam under operational conditions.