How to Sew a Rolled Hem with a Serger
A rolled hem creates a narrow, enclosed edge by folding the fabric underneath as the serger trims and wraps it with thread. It is useful for scarves, lingerie, napkins, ruffles, lightweight garments, and curved hems where a conventional double-fold finish may look bulky. Once the machine is adjusted, the process is quick and consistent.
The best results come from matching the stitch to the fabric rather than copying one setting for every project. Fine cotton lawn, polyester satin, rayon, silk blends, and lightweight linen all behave differently under the presser foot. A little testing on a fabric offcut is more reliable than changing settings on the finished garment.
Prepare the machine and fabric
Begin by cleaning lint from the loopers, needles, feed dogs, and cutting area. Insert a new fine needle, usually 70/10 or 80/12 for light woven fabric, and thread the machine with quality polyester or decorative thread. For an especially soft edge, woolly nylon in the loopers can provide fuller coverage, although it may need careful tension adjustment.
Most overlockers form a rolled hem using one needle and either two or three threads. Remove the left needle and use the right needle for a three-thread narrow hem, unless your manual specifies a different arrangement. Retract or remove the stitch finger, engage the rolled-hem setting, and check that the knife will trim a clean, even edge.
Trim away loose threads and straighten the fabric edge before sewing. A slightly curved or uneven edge can cause missed coverage, particularly on slippery material. On fabrics that fray heavily, avoid pulling the edge towards the rear of the machine. Let the feed dogs move it naturally while you guide it lightly.
Choose settings for a neat narrow edge
Start with a stitch length around 1.0 to 1.5 mm, a stitch width near the narrow end of the machine’s recommended range, and a differential feed setting of 1.0. These figures are starting points rather than fixed rules. The seam should wrap over the edge without creating a stiff cord or exposing the raw fabric.
Sew a sample at the same grain direction and with the same number of layers as the project. If the edge curls too tightly, reduce the upper looper tension or slightly lengthen the stitch. If the fabric shows between stitches, increase coverage by adjusting the looper tension, stitch width, or thread choice. Make one change at a time so you can identify its effect.
Lightweight Australian summer fabrics often need a softer finish. Linen used for clothing in Brisbane or Sydney can respond well to a slightly longer stitch and gentle differential feed, while fine rayon may require slower sewing to prevent stretching. In humid coastal conditions, allow fabric and thread to acclimatise before testing, as moisture can affect handling and pressing.
| Fabric or project | Useful starting approach | Common adjustment |
|---|---|---|
| Cotton lawn or voile | Three-thread rolled hem, fine needle, short stitch | Reduce tension if the edge feels firm |
| Polyester satin | Slow speed, sharp needle, light handling | Lengthen stitch if the edge puckers |
| Rayon or viscose | Moderate differential feed, stabilise the edge | Lower differential feed if waves appear |
| Lightweight linen | Short-to-medium stitch, test both grain directions | Increase coverage if fraying shows |
| Scarf or ruffle | Decorative thread in the upper looper | Balance tensions before sewing the full edge |
Sew the hem without stretching
Place the fabric under the presser foot with the edge aligned to the trimming blade. Lower the presser foot, hold the thread chain behind the foot, and sew several stitches. Stop briefly to check whether the thread is wrapping the edge evenly. The fabric should pass through smoothly, with the knife removing only a small amount.
Avoid pushing or pulling the fabric. Stretching creates lettuce edges, especially on knits and bias-cut pieces. If a woven edge waves, reduce the differential feed below 1.0 or support the fabric with a removable stabiliser. If a knit edge needs deliberate rippling for a frill, increase differential feed instead and test the amount of fullness first.
At the end, continue sewing a short chain, then secure it according to the fabric and project. For a garment hem, thread the chain back into the stitches with a large-eye needle or use a small amount of seam sealant where appropriate. Do not cut the chain flush if the hem will receive frequent washing.
Solve loose loops and uneven coverage
Loops hanging beyond the edge usually indicate an imbalance in tension, an incorrect stitch finger position, or an edge that is not being trimmed consistently. Check threading first, following the colour-coded path with the presser foot raised. A single thread sitting outside its guide can make the entire rolled hem look defective.
If the hem tunnels, the thread tensions may be too tight or the stitch width may be too narrow for the material. If it curls into a hard rope, loosen the relevant looper tension and try a finer thread. When the hem skips stitches, replace the needle, confirm that it is fully inserted, and reduce sewing speed.
Some machines offer a two-thread rolled hem using an upper-looper converter. This can create a lighter finish, but it is less forgiving on fabrics that fray. A three-thread version usually provides better edge coverage for garments and household textiles. Check the manufacturer’s instructions before changing the converter or stitch finger, since mechanisms vary between models.
Finish, press, and maintain the result
Press the completed edge lightly from the wrong side using a temperature suited to the fabric. Rayon and synthetic satin can shine or distort under excessive heat, while linen generally tolerates more heat and steam. Pressing should settle the edge rather than flatten the thread coverage completely.
For a circular hem, overlap the beginning and ending stitches by a few centimetres, then secure the thread chain neatly. On a scarf or table linen, test laundering before making the final hem, particularly when using decorative or woolly nylon thread. The Australian climate makes regular washing and line drying common, so a finish that looks attractive but unravels after care is not practical.
When comparing sergers sold in Australia, check that the machine is supplied for the local 230–240V, 50Hz electrical system and includes an Australian-compatible plug. Imported models may appear cheaper in overseas marketplaces, yet shipping, replacement parts, and warranty support can change the real cost. Under the Australian Consumer Law, products must be of acceptable quality and match their description; those protections are separate from any manufacturer’s voluntary warranty.
Keep the manual, purchase receipt, and model details together, especially if buying during an end-of-financial-year sale or from a large retailer such as Spotlight. For questions about machine settings, accessories, or a particular rolled-hem result, the ISewingMachine contact page is a useful place to seek site-specific assistance. A cleaned machine, correctly threaded loopers, and a carefully tested fabric sample will usually produce a narrow edge that is smooth, durable, and suitable for both everyday sewing and more polished projects.