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  • 3M™ Dual Lock™ Reclosable Fastener SJ3799, Roll Good with Rigid Back, Stem Density 170, Black
  • 3M™ Dual Lock™ Reclosable Fastener SJ3799, Roll Good with Rigid Back, Stem Density 170, Black

    3M ID B40068892
    • Interlocking mushroom-shaped stems snap together to form a strong, fast and easy attachment
    • Appropriate for ultrasonic welding
    • Strong holding power reduces the rattling and vibration of components
    • Resistant to high temperatures and solvents
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    Product Details
    • Interlocking mushroom-shaped stems snap together to form a strong, fast and easy attachment
    • Appropriate for ultrasonic welding
    • Strong holding power reduces the rattling and vibration of components
    • Resistant to high temperatures and solvents
    • Audibly snaps together for a secure, dependable and repeatable attachment.
    • Mates with other stem densities to achieve a variety of engagement and disengagement forces

    3M™ Dual Lock™ Reclosable Fastener SJ3799, Roll Good with Pressure Sensitive Adhesive, Black is a reclosable fastener with a rigid polypropylene backin. It has a stem density of 170 stems per square inch. The mushroom-shaped stems interlock to supply very high tensile strength and replace mechanical fasteners in many applications.

    Illustration of Polypropylene fastener
    Interlocking mushroom-shaped polyolefin stems
    Convenient for Automotive Trim
    Ideal for attaching 3M™ Dual Lock™ Reclosable Fastener SJ3799 low surface energy (LSE) polypropylene automotive trim components. These polypropylene based Dual Lock reclosable fasteners have a thicker backing than standard plainback Dual Lock reclosable fasteners that improves the capability and robustness of the ultrasonic welding process. These reclosable fasteners are easy to open and reclose in high cycle applications. 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. Dual Lock fasteners are constructed with polyolefin stems and hold tight regardless of high heat, cold, moisture or humidity. These fasteners are also an excellent attachment solution when vibration is an issue — not only do the fasteners hold tight, but actually reduce vibration and rattling.

    How It Works
    The fastener has a thicker polypropylene backing for a more robust ultrasonic welding process, requiring less welds per piece. The thicker backing provides a more rigid fastener, reducing lifting or flexing during disengagement - holding firm to the base through many openings and closings.

    When two pieces of 3M™ Dual Lock™ Reclosable Fasteners are pressed together, the stems flex and the mushroom heads slide past each other. After passing the opposing mating piece, the stems snap back into their original position and the opposing mushroom heads interlock. These fasteners can provide high tensile strength but can be opened by simply cleaving or peeling open the closure. Alignment and re-alignment is easy with no special tools required. This means that these fasteners can be used to attach components before they enter the final assembly plant, 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 force to meet application requirements.
    170 stems/inch2 (26 stems/cm2)
    Stem Densities
    Combinations of stem densities and the engaged area provide adjustable and proportional engagement and disengagement force to meet application requirements. Dual Lockfasteners are offered in three different densities (stems per square inch): 170, 250, and 400. The Dual Lock fastener SJ3799 has 170 stems per square inch (25mm), offering the lightest hold, and can be mated to Type 170, 250 or 400.

    Recommended Applications
    3M™ Dual Lock™ Reclosable Fasteners can replace conventional mechanical fasteners in a wide range of assembly and attachment applications where reclosability or serviceability is desired. Dual Lock fasteners are used primarily to secure rigid and semi-rigid surfaces such as trim or door panels, instrument panel bezels, headliners, and other automotive interior and exterior trim.

    3M Science Delivers Closures You Can Count On
    3M™ Dual Lock™ Reclosable Fasteners are ideal for many applications where a high strength, reclosable fastening system is required. 3M engineers have uniquely combined physics and materials science to bring the automotive industry reliable fasteners that supply high performance even after exposure to high moisture levels and wide temperature ranges. For applications that require a pop-in piece and multiple closures, look no further than the long-lasting durability of the 3M™ Dual Lock™ Reclosable Fastener SJ3799. It is yet another outstanding example of how 3M technologies advance operations in the automotive industry, providing both ease of use and superior results.

    Learn more about 3M™ Dual Lock™ Reclosable Fasteners (PDF, 2.95 Mb)

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