Elastic · 142yds/130m · 100% PTT · Stretches up to 65%
Mettler Seraflex Elastic Thread 7840-4000 Black is the go-to choice for sewing stretch and knit fabrics. Made from innovative PTT fibre, it stretches up to 65% and recovers fully — keeping seams comfortable and flexible through every movement.
Key Features
Stretches up to 65% — ideal for stretch fabrics, knits, and activewear
142yds/130m per spool
100% PTT (Polytrimethyleneterephthalate) — elastic recovery with smooth stitch formation
Use as needle and bobbin thread with loose tension for maximum elasticity
Recommended for straight stitches only
Compatible with domestic sewing machines
Recommended Uses
Stretch and knit fabrics — women’s, men’s, and children’s clothing
Sportswear, activewear, and outdoor apparel
Underwear and lingerie
Any application requiring seam elasticity
Needle Recommendations
70/10 or 80/12 Stretch or Jersey Needle recommended
Use the loosest possible thread tension for best results
Free shipping on Fabric orders over $250 CAD
Free shipping on Domestic Sewing Machines within Canada
Most items are in our brick and mortar store, but note some items will be shipped from a warehouse location
