3M™ Dual Lock™ SJ3870 Reclosable Fastener 3M™ The 3M™ Dual Lock™ SJ3870 reclosable fastener is a high-strength fastening solution designed for durable, removable industrial assemblies. Featuring high-density polyolefin stems combined with a powerful acrylic adhesive, it delivers reliable bonding to challenging surfaces such as low surface energy plastics, metals, and painted substrates. Common applications include mounting panels, access covers, electronic components, industrial signage, and interior fittings, making it an effective alternative to screws and rivets while simplifying installation and maintenance. Learn more