The ST4031HD belongs to Brother's Strong & Tough line: a 3/4 thread serger with a metal frame and a stouter motor than the basic models. It reaches 1,300 stitches per minute, uses color coded lay-in threading and a free arm, and arrives with a six pack of thread cones, so nothing else is needed on the first day. Stitch width and length set with dials, and differential feed keeps knit edges from stretching out.
Made for people who sew heavier things: work clothes, tote bags, upholstery weight cotton, outdoor fabric. Anyone who mostly hems silk will not need this much machine. The blade cuts clean, yet the noise is noticeable and lint gathers fast, so brushing the knife area after each project matters. No coverstitch here, and the printed manual is thin on troubleshooting.
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