Manufacturer · Fashion Accessories
Waxed thread for leather is a strong synthetic or linen thread impregnated with wax and intended mainly for hand sewing. The wax holds the fibres together, helps the stitches tighten and stay tight, and protects the seam from moisture and dirt. It is used for wallets, belts, bags, cases, straps and leather goods repairs.
What the wax does in the thread
The wax coating has several practical functions that explain why leatherworkers almost always use such thread:
- Grip. Waxed thread "sticks" slightly in the hole, so a tightened stitch does not loosen while you make the next one.
- Protection from fraying. When pulled through the leather repeatedly, the fibres do not separate and the thread does not fluff up.
- Sealing. The wax fills the hole around the thread and limits water penetration.
- Finishing. The ends of synthetic waxed thread can be melted with a flame, and the wax helps them stick to the leather.
Types of waxed thread for leather
Waxed polyester thread
This is the most common option. Polyester is strong, does not rot, is unaffected by moisture and keeps its colour. It comes in a braided version with a round cross-section and a twisted version that is flatter. The braided one is stable and easy for beginners, while the flat one sits more snugly in the slanted hole and gives the classic angled look of the saddle stitch.
Waxed linen thread
Linen is the traditional choice for saddlery and shoemaking. It has a matte, natural look that many people associate with handcraft. Linen is also sold unwaxed – the craftsman then draws it through a block of beeswax himself. It requires more care: it is less even in thickness and, if poorly waxed, can be affected by moisture.
Waxed polyamide thread
Less common. It has high strength and elasticity, but it is slippery and can stretch slightly under strong tension. It is used mainly for repair work.
Waxed thread thicknesses in mm
Waxed threads for hand sewing are usually designated by their diameter in millimetres. The indicative correspondence between thickness and product is as follows:
| Thickness | Products | Leather thickness |
|---|---|---|
| 0.35–0.45 mm | Small wallets, card holders, fine leather goods | 0.8–1.2 mm |
| 0.55–0.65 mm | Wallets, phone cases, key rings, small bags | 1.2–2 mm |
| 0.8 mm | Bags, backpacks, holsters, watch straps with visible stitching | 2–3 mm |
| 1.0–1.2 mm | Belts, dog leads, saddlery, heavy bags | 3–5 mm |
The thickness must also match the spacing of the stitching chisel (pricking iron). With a spacing of about 3 mm, threads of 0.45–0.55 mm sit naturally, and with about 4 mm, 0.65–0.8 mm. A thick thread in a tight spacing fills the holes too densely and the leather between them can tear.
How to work with waxed thread
- Measure the thread. For a saddle stitch with two needles you need approximately 4 times the length of the seam plus a reserve for the needles.
- Secure the needles. Pass the end through the eye of the blunt needle and pierce it with the tip of the thread, or twist it around itself so it does not slip out.
- Tighten evenly. Each stitch is tightened with the same force. Uneven tension shows as a "wavy" seam.
- Finishing. Go back 2–3 stitches, cut the thread close to the leather and melt the end of synthetic thread with a lighter. Linen thread is not melted – the end is glued or hidden between the layers.
Waxed thread on a machine?
Waxed thread is not suitable for standard industrial machines. The wax builds up on the tensioners, the guides and in the bobbin case and upsets the tension. For machine sewing, bonded polyamide or polyester thread with a dry coating is used. Some specialised leather machines and shoe machines work with waxed thread, but this is the exception and requires the appropriate set-up.
Common problems and how to avoid them
- The thread frays at the needle eye. You are working with too long a thread, or the thread is rubbing against the edge of the hole. Shorten the working length and check that the holes are large enough.
- The seam looks uneven. The most common cause is different tightening force or changing the order in which the needles pass. Keep the same order for every stitch.
- The wax leaves marks on the leather. Excess wax is removed by rubbing lightly with a piece of cloth or by brief warming after the seam is finished.
- The thread has become stiff. Wax hardens in the cold. Warm the spool in your hands or at room temperature before working.
Store waxed thread in a cool, dry place, away from direct sunlight and heaters. This way the wax does not soften and stick between the windings.
Colours and matching
Waxed thread for leather comes in a wide range: natural tones, black, brown, cognac, beige, white, as well as bright colours for contrast stitching. The wax slightly darkens the colour, so compare a thread sample with the leather in daylight. If the product has metal hardware, such as metal buckles for belts, match the thread colour to it as well – for example a light thread with nickel or a warm beige with brass.
Waxed thread wholesale from Polkom
Polkom supplies threads for shoes and leather wholesale, including waxed threads for hand sewing, to workshops, leather goods manufacturers and brands. We can also offer leather labels with your logo. Minimum quantities depend on the article – send an inquiry via our contact page and we will send you samples in the colours you need.
