3M™ Dual Lock™ Reclosable Fastener SJ3221 is a square reclosable fastener with a single disk base for pop-in insertion into a key hole slot. It is lined with polyolefin mushroom stems of density 250, and can be paired with other stem densities for varying levels of interlocking strength. Stems provide superior strength over hook and loop closures yet easily peel apart for internal access.
Convenient Assembly and Re-Assembly for Automotive Trim Ideal for attaching automotive trim components, our 3M™ Dual Lock™ Reclosable Fastener SJ3221 provides a high-strength closure that is easy to assemble and just as easy to re-open and re-assemble, even hundreds of times. Moreover, the pieces audibly snap together with a satisfying click to form a secure, dependable and repeatable attachment. Designed with hundreds of interlocking mushroom-shaped stems, this polypropelene fastener can replace conventional attachments such as screws or adhesives, which can be time-consuming to fit and assemble, may weaken the part, or are susceptible to vibration and weather extremes. A Dual Lock™ Fastener is constructed with polyolefin stems and holds tight regardless of high heat, cold, moisture or humidity. It is also an excellent attachment solution when vibration is an issue – not only does the fastener hold tight, but it actually reduces vibration and rattling. Additional Features include: Fast assembly with no drilling or additional tools required Hidden attachment avoids unsightly mechanical fasteners on the show surface High temperature and solvent resistance Mushroom heads that allow flexibility in alignment for easy attachment of components Can be used to attach components before they enter the final assembly plant, thus helping to reduce the number of parts and the length of assembly time Combinations of stem densities and the engaged area provide adjustable and proportional engagement and disengagement forces An audible snap confirms that the part is correctly installed with minimal insertion force required by the assembly worker How It Works This pop-in fastener is designed to be popped into a key hole slot where attachment is desired. Its polypropylene disk base grips the inside of the hole and holds tight. The fastener can then be mated to a second Dual Lock™ fastener attached to a piece of trim or other part – when
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