After months of searching, we finally have what we consider to be the ultimate conductive thread. It's thin, strong, smooth, and made completely of 316L stainless steel. Once you start working with this thread you'll quickly agree its optimal for any wearables work!
This thread is 3 ply, thicker than every day polyester or cotton thread but still thin enough to be sewn by hand in medium-eye needles. This may be sew-able by a sewing machine that can handle 'heavy' thread. Because it is strong and smooth, its ideal for any wearable/e-textile project. It also has fairly low resistivity, 10 ohms per foot so you can use it to drive LEDs and other electronic components that use under ~100mA.
Because it is made of stainless steel fibers, it will not oxidize like silver does: your projects will not 'stop working' because of oxidation after a few months and its safe to wash. However, this thread is a little 'stiff', it feels a little like 'waxed thread' and is not ideal for making iPhone-compatible gloves.
Comes in a small metal (or plastic) bobbin with 18 meters/60 feet wound on.
- Measures 0.25mm thick, 3 ply thread, 0.83 ohm per inch
Conductive Thread - Stainless Medium - 3 Ply - 18m (60ft) 
- Brand: Adafruit
- Product Code: ADA-641
- Reward Points: 7
- Availability: 3
- Ex Tax: £7.55
- Price in reward points: 100