Dual Lock hook-and-loop fastener

• Thanks to the snap-in fastening, screws, nails, snap fasteners, or rivets are no longer required
• Five times the tensile strength compared to conventional hook-and-loop tapes
• Durability – Up to 1,000 open-close cycles before losing 50% of original tensile strength
• Excellent thermal resistance at temperatures up to 82 °C
• Black interlocking mushroom-shaped heads (40 heads per cm²)
• Moisture and UV resistant
• Dampens vibrations
• Suitable for indoor and outdoor use

The 3M™ Dual Lock™ Flexible Hook-and-Loop Fastener SJ3870 is made of black polypropylene with a modified acrylic adhesive on the back. Our product is suitable for a wide variety of indoor and outdoor applications. It is 6.1 mm thick when closed and offers a long service life.

Repeated opening and closing for repositioning: Our remarkable 3M™ Dual Lock™ Flexible Fastener SJ3870 retains at least 50% of its original tensile strength after 1,000 open-close cycles. The mushroom heads glide smoothly over each other before interlocking under pressure to create a robust fastening solution. Once joined, the fastening tape remains hidden, providing a flush surface for a smooth, clean appearance. The polyolefin fastening tape, with 40 heads per cm², can be paired with counterparts featuring 26, 40, or 62 heads per cm². This allows the user to select the appropriate tensile strength depending on the application.

Suitable applications: general industry, transportation, specialty vehicles, medical, military, packaging, point-of-purchase advertising solutions, exhibitions, electronics, construction, furniture, and maintenance, repair, and overhaul (MRO).

The smooth back of this flexible pressure-sensitive fastener features a modified acrylic adhesive with excellent adhesion to many plastic materials (polyethylene, acrylic, polycarbonate, and ABS), powder-coated surfaces, and materials with low to medium surface energy, requiring little or no surface pretreatment.

Audible click
“Locked in place!” is probably the phrase that best describes the products in our extensive 3M Dual Lock™ range. Here’s how the design works: The mushroom heads of two parts of a 3M™ Dual Lock™ flexible hook-and-loop fastener slide over each other until they are anchored together by pressure. After the opposing mushroom heads are joined, they return to their original position and snap into the opposing heads. An audible click signals that the fastener is secured. This fastening system provides holding power comparable to screws or rivets. However, the fastener can be easily reopened for repositioning. 3M Dual Lock flexible hook-and-loop fasteners are widely used in transportation, electronics, office equipment, the machinery industry, medicine, and for signage and display solutions.

No screws required
Strong fastening combined with effortless removal. Simply pull the fastener apart to release it and reattach it elsewhere. This product provides a strong, hidden fastener capable of withstanding numerous open-close cycles, allowing you to eliminate screws, rivets, hooks, bolts, zippers, and other unsightly fastening methods. In short—this fastening tape is an aesthetically pleasing choice without compromising on holding power. In fact, the tensile strength of SJ3870 is five times higher than that of 3M™ hook-and-loop tapes in comparable applications. In many cases, this fastener also saves money, as fewer fastening materials are required. Furthermore, there is no need to drill holes that could damage part or all of the object. No tools are required to connect and disconnect the flexible hook-and-loop fastener.

More options for securing, fastening, and joining surfaces: 3M Dual Lock flexible hook-and-loop fasteners enable quick attachment and high holding power with easy separation, just like a zipper. Thanks to functional flexibility, superior aesthetics, low weight, and savings in labor and installation costs, these innovative 3M fastening products are a popular and effective solution.