Description 3M Dual Lock Reclosable Fastener Black (SJ3550) 3M Dual Lock Reclosable Fastener Black (SJ3550) Black, interlocking mushroom-shaped heads (250 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times Mates with Type 170, Type 250 or Type 400 stem densities to provide different strength combinations White, acrylic, conformable foam tape bonds well to a variety of substrates including metals and plastics such as acrylics, polycarbonate and ABS Strong fastener secures with an audible snap, verifying closure An alternative to screws and bolts, this hidden fastener provides a snug fit and smooth aesthetic appearance Features good temperature resistance of 200°F (93°C) Best suited for indoor and outdoor use Design Flexibility 3M™ Dual Lock™ Reclosable Fastener SJ3550 consists of interlocking mushroom-shaped heads that easily slide over each other, allowing for positioning of parts before being snapped together. This fastening process creates a durable attachment and provides fast product assembly with great design flexibility. Our reclosable fasteners can also engage with different stem densities for varying levels of strength and system performance.
