Details
3M Dual Lock Reclosable Fastener SJ3550 is a fastening solution that can replace screws, bolts and rivets. The black strips carry hundreds of mushroom-shaped stems that audibly snap together, and a strong adhesive backing bonds them to your parts. You can adjust, realign or reattach with ease, and the finished part keeps clean, smooth lines free of holes. Each piece is 10 cm long.
Properties
- Type
- Reclosable mushroom fastener, adhesive backed
- Model
- 3M Dual Lock SJ3550
- Stem density
- 250 stems per square inch
- Adhesive
- Acrylic foam tape (VHB type)
- Length
- 10 cm per piece
- Color
- Black
Snap it together, pull it apart
When two pieces of Dual Lock are pressed together, the stems flex and the mushroom heads slide past each other, then snap back and interlock. 3M says the closure sounds an audible snap, so you know it is secure. To open it, peel the pieces apart by hand. 3M rates the SJ3550 for up to 1,000 closures before it loses 50% of its original peel strength.
Mount without screws or holes
Use it to mount an SSD, a pump, a reservoir, a controller, a fan hub or an LED controller inside a case, or to hold a removable panel or dust filter in place. No drilling, screwing or sewing is needed, and the fastener stays hidden beneath the parts. The heads slide over each other until you press firmly, so you can position the part before it locks.
Strong adhesive backing
3M backs the SJ3550 with a white, conformable acrylic foam tape under a removable printed liner. 3M says it bonds well to metals and plastics such as acrylics, polycarbonate and ABS, and calls the bond heat, chemical and UV resistant. 3M lists a long-term temperature resistance of 93 °C (200 °F) and says the SJ3550 suits indoor and outdoor use.
Stronger than hook and loop
The SJ3550 has a stem density of 250 stems per square inch (39 per square centimeter). 3M says this gives up to 5 times the tensile strength of typical hook-and-loop products. Type 250 mates with itself, so both halves of a fastening can be cut from the same strip.
Technical data
| Make | 3M |
| Model | Dual Lock SJ3550 |
| Stem density | 250 stems/in² (39 stems/cm²) |
| Stem material | Polyolefin |
| Adhesive | Acrylic foam tape, white (VHB type) |
| Thickness, one piece | 3.51 mm |
| Engaged thickness | 5.74 mm |
| Liner | Clear polyolefin with red print, 0.1 mm |
| Closure life | 1,000 closures to 50% of peel strength |
| Temperature resistance | 93 °C (200 °F) long term |
| Mates with | Dual Lock Type 170, 250, 400 |
| Length | 10 cm per piece |
| Color | Black |
Notes
- Each piece is 10 cm long. Several pieces come as one continuous strip: for example, if you buy 10 pieces, you receive one 100 cm long fastener.
- A fastening needs two pieces, one on each part. Cut the strip in two and press the halves together, stems to stems.
- For the best bond, clean both surfaces with isopropyl alcohol, press the fastener on firmly and give the adhesive time to build its strength before you load it.
In the box
- 1x 3M Dual Lock Reclosable Fastener (10 cm piece)
3M's technical data sheet is a PDF.
