3M™ Dual Lock™ Reclosable Fastener SJ3221, Pop-In Piece Part, Stem Density 250, Black, 20 mm x 20 mm

3M™ Dual Lock™ Reclosable Fastener SJ3221 is a square reclosable fastener with a single disk base for pop-in insertion into a keyhole slot. It is lined with polyolefin mushroom stems of density 250 per square inch 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.

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 polypropylene 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. 3M™ Dual Lock™ Reclosable Fasteners are 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 also reduces vibration and rattling.