Thread spool Brother Madeira Aerolock 8420 Dark Blue 2500 m

Brother Madeira Aerolock 8420 Dark Blue is a 2500-meter spool of overlock/serger thread formulated for consistent feeding and stable seams on overlock and coverstitch machines. This dark blue polyester thread supports garment construction, edge finishing and work with stretch fabrics, providing a long spool length suitable for production sewing and extended projects where color matching and continuity are required.

Advantages

The thread offers high tensile strength and uniform thickness to reduce breakage and skipped stitches during high-speed overlocking. Its smooth surface allows reliable feeding through loopers and needles, while colorfast polyester composition resists fading and washing. The 2500 m spool size minimizes downtime from frequent thread changes and suits continuous runs.

Suitable for

• Overlock and serger seams on garments and home textiles
• Edge finishing and seam reinforcement on knit and woven fabrics
• Coverstitch operations for hems and decorative topstitching
• Production sewing and mending where long spool length is needed

Key specifications

• Thread type: polyester overlock/serger thread
• Spool length: 2500 meters
• Color: dark blue
• Recommended machines: overlock/serger and coverstitch machines
• Performance: designed for consistent feed at high stitching speeds

How to use

Thread the loopers and needles of the overlock or coverstitch machine according to the machine manufacturer’s threading paths, using the spool on a compatible spool holder to ensure free rotation. Adjust tension and stitch length for fabric type—lower tension and longer stitch length for bulky knits, and slightly higher tension for fine woven fabrics. Test stitch on a fabric scrap in the same weight and stretch as the final piece to confirm stitch appearance and strength before sewing the main item.

Usage recommendations

Store the spool in a dry, dust-free place away from direct sunlight to preserve color and fiber integrity. Replace needles regularly and match needle type and size to fabric to reduce abrasion and thread breakage when using this polyester overlock thread.